Cable Anchors

Cable anchors are post-tensioned multi-strand prestressed anchors that drill deep into competent rock or dense soil, develop bond along a fixed-length zone, and are stressed to lock in 200 to 2000 plus kips of holding load. They are the high-capacity end of the post-tensioned ground anchor family, used for dam abutment stabilization, large rock-mass tie-down, deep landslide remediation, and the foundation anchoring of high-energy rockfall barriers.

200-2000+

Kip Capacity Range

50-300

Ft Tendon Length

ASTM A416

Grade 270 Strand

PTI DC35.1

Acceptance Standard

Overview

Understanding Cable Anchors

Cable anchors are the heavy-capacity end of the post-tensioned ground anchor family, specified when load demand or anchor depth exceeds what a single threadbar or shorter strand bundle can carry. A multi-strand tendon, typically a bundle of seven-wire prestressing strands meeting ASTM A416 Grade 270, is drilled deep into competent rock or stiff soil, grouted along a defined bonded fixed length, and stressed to 200 to 2000 plus kips of holding load before the structure begins to deflect. Cable anchors pair routinely with structural shotcrete facings on rock cuts and dam abutments, with soldier pile and H-pile walls on the deepest urban excavations, and with high-energy rockfall barriers as foundation tie-downs above transportation corridors. For wall-mounted retaining and excavation shoring use of the same product family with single threadbar or moderate-strand tendons, see tieback anchors.

What Are Cable Anchors?

A cable anchor is a post-tensioned ground anchor in which the load-bearing tendon is a bundle of seven-wire prestressing strands per ASTM A416 Grade 270, drilled into competent rock or dense soil, grouted along a defined bonded fixed length, and stressed against a bearing plate using a multi-strand hydraulic jack. The unbonded free length passes through the active failure surface without engaging the moving mass, transferring the entire tendon force from the bearing plate at the rock or wall face into the bonded fixed length seated in stable ground at depth. Cable anchors are the high-capacity end of the post-tensioned anchor family, with single tendons routinely sized between 200 and 2000 plus kips and free lengths reaching 200 plus feet, beyond what any single threadbar can practically deliver.

The terms cable anchor, strand anchor, multi-strand tendon, and prestressed rock anchor are used interchangeably across specifications, with the Post-Tensioning Institute DC35.1 and the FHWA Geotechnical Engineering Circular No. 4 (FHWA-IF-99-015) as the canonical North American design references. Modern civil practice traces back to early dam reinforcement work in the 1930s, with the 1934 Cheurfas Dam strengthening in Algeria typically cited as the first major prestressed rock anchor application. The system entered mainstream U.S. practice on Bureau of Reclamation and USACE dam projects beginning in the 1960s and has since become the default deep-anchor solution for dam-monolith stabilization, large rock-mass tie-down, deep landslide remediation, and foundation anchoring of high-energy rockfall barriers. For wall-mounted retaining and excavation shoring use of the same product family, see tieback anchors.

Key Benefits

Very high load capacity in a single tendon
Active pre-loaded restraint at install
Long practical free lengths in challenging geology
Critical for dam, landslide, and rockfall barrier foundations
Long service life with double corrosion protection

Used In Our Services

Drilling

Grouting

Rock Anchoring

The Engineering

How Cable Anchors Work

How the system carries load in service, and how we build it on site.

Construction begins with rotary or rotary-percussion drilling of a large-diameter borehole, typically 6 to 12 inches across to accommodate the multi-strand tendon, the corrosion-protection sheathing on permanent installations, and the required grout cover. The hole is advanced through the active failure zone and into competent rock or dense soil at the design inclination, usually 15 to 45 degrees below horizontal for slope and dam-abutment work. In caving ground or where the borehole must pass through fractured rock, duplex drilling or temporary casing keeps the hole open until the tendon is in place.

The tendon is a bundle of 0.5 or 0.6 inch diameter seven-wire prestressing strands per ASTM A416, with bundle counts scaling from 4 strands for 100 kip systems up to 30 plus strands for 2000 kip systems. The unbonded free length is sleeved in smooth plastic sheathing filled with corrosion-inhibiting grease, and the bonded fixed length is left bare or encapsulated in a corrugated plastic duct depending on the corrosion class. PTI Class I (encapsulated double corrosion protection) is specified for permanent installations with 75 to 100 plus year design lives, while PTI Class II (grout-protected) is used for temporary construction-phase applications. The assembly is inserted with centralizers and spacers to maintain consistent grout cover, and neat cement grout is pumped through a tremie line from the toe of the bond zone upward, displacing drilling fluid and filling the bonded length around the strands.

Once grout reaches design strength, typically 7 to 10 days, the anchor is stressed using a multi-strand hydraulic jack acting against a steel bearing plate at the head. The tendon is loaded incrementally per a defined performance test or proof test sequence, with displacement measured at each load increment to verify that the bonded fixed length is fully engaged and creep is within acceptance limits. After stressing, individual strands are locked off by setting tapered wedges into a steel anchor block, transferring load permanently to the structure. Every production anchor is proof-tested to 133 percent of design load per PTI DC35.1, and a defined sample of anchors receives extended performance and creep testing on cohesive bond zones.

Borehole Drilling

A 6 to 12 inch diameter borehole is drilled through the active failure zone into competent rock or dense soil at the design inclination.

Tendon Installation

A multi-strand seven-wire tendon per ASTM A416 is placed inside corrosion-protection sheathing with centralizers and spacers.

Bond Zone Grouting

Neat cement grout is tremie-pumped from the toe upward, filling the bonded fixed length while the unbonded free length remains isolated.

Stressing

After grout reaches design strength, the anchor is stressed using a multi-strand hydraulic jack to apply active design load.

Lock-Off and Testing

Tapered wedges lock individual strands at the bearing plate; every anchor is proof-tested to 133 percent of design load per PTI DC35.1.

System Variants

Types of Cable Anchors

Type 01

Permanent Multi-Strand Cable Anchors

Permanent multi-strand cable anchors are the design-life standard for dam abutments, permanent retaining structures, rockfall barrier foundations, and any installation where the system must remain functional for the full structure design life. They use PTI Class I encapsulation, in which each strand passes through grease-filled smooth plastic sheathing along the unbonded free length and the entire bonded fixed length is sealed inside a corrugated plastic duct. Two independent corrosion barriers (the encapsulating duct plus the surrounding cement grout column) protect the steel from chloride intrusion, sulfate attack, and stray current corrosion, supporting design service lives of 75 to 100 plus years. Permanent cable anchors are the system specified on Bureau of Reclamation and USACE dam stabilization projects, on permanent rockfall barrier foundations under EAD 340059 Class 7 and 8 kits, and on highway and railway permanent slope retaining works.

Type 02

Temporary Multi-Strand Cable Anchors

Temporary cable anchors are specified for construction-phase support with service lives up to 18 to 24 months, including deep excavation shoring during basement construction, slope-cut retention during permanent structure installation, and any application where the anchor will be decommissioned at end-of-construction. They use PTI Class II protection, with the tendon grout-protected only (no encapsulating duct), which materially reduces materials cost relative to permanent anchors. Temporary cable anchors carry the same per-anchor load capacity as their permanent counterparts and are stressed to the same design loads, with the same proof and performance testing per PTI DC35.1. They are commonly paired with soldier pile walls and secant pile walls on deep urban excavations where the wall and anchors are demolished or decommissioned once the permanent below-grade structure is in place.

Type 03

Restressable and Removable Cable Anchors

Restressable and removable cable anchors are engineered for special service requirements that conventional permanent or temporary anchors do not address. Restressable anchors retain access to the tendon stressing head over the full service life so that the tendon can be re-loaded if monitoring detects load loss from creep, ground deformation, or unexpected loading; they are common on long-term dam-safety installations under FERC and USACE dam safety programs. Removable anchors are designed with a release mechanism (typically a center-pull strand de-stranding system) that allows the tendons to be pulled back through the bond zone after the temporary excavation is complete, leaving no permanent encroachment on neighboring property. Removable systems are the system of choice on tight urban sites where the active anchor zone would otherwise require permanent subsurface easements from adjacent property owners. The tradeoff is materials cost: removable and restressable systems carry a meaningful premium per anchor over conventional configurations, justified by the specific service requirement.

Side By Side

Cable Anchors vs Other Reinforcement Systems

Cable Anchor vs Tieback Anchor

Cable anchor and tieback anchor describe the same underlying product, a post-tensioned ground anchor, but the terms emphasize different parts of the application space. Cable anchor emphasizes the strand-tendon configuration (a bundle of seven-wire prestressing strands per ASTM A416) and is most commonly used on deep rock-mass anchoring, dam stabilization, large landslide remediation, and rockfall barrier foundations where capacity demand and free length both push past what a threadbar can deliver. Tieback anchor emphasizes the wall-mounted lateral retention application and covers both strand-tendon and threadbar configurations equally, since the typical tieback for excavation shoring or retaining wall use falls in the 100 to 600 kip range where threadbars and small strand bundles are interchangeable. On a large project, the two terms describe the same physical anchor sized to different demands, and selection follows the load and length: cable-anchor multi-strand configurations dominate above the 600 kip threshold and on tendons longer than approximately 100 to 150 feet. See tieback anchors for the wall-mounted retaining application page.

Cable Anchor vs Rock Bolt

The defining difference is depth, capacity, and whether the steel element resists tension developed at the bearing plate or transfers load along its full grouted length. A cable anchor is long (50 to 300 feet), has an unbonded free length plus a bonded fixed length seated deep in stable rock or soil, and is post-tensioned to high holding loads (200 to 2000 plus kips) using a multi-strand hydraulic jack. A rock bolt is short (4 to 25 feet), grouted along most or all of its length, and ties surface blocks back to competent rock immediately behind the failure zone, with capacities typically in the 20 to 100 kip range. Cable anchors carry the deep retaining or rock-mass tie-down load on dams, large block restraint, and rockfall barrier foundations; rock bolts handle near-surface block stability and primary internal support in tunnels. Both routinely appear on the same project, with rock bolts treating the upper raveling rock face and cable anchors carrying the deep stability of the rock mass behind it.

Cable Anchor vs Threadbar Anchor

Within the post-tensioned ground anchor family, cable (multi-strand) and threadbar tendons are the two principal configurations, selected on capacity, free length, and operational requirements. Cable tendons bundle 4 to 30 plus seven-wire prestressing strands per ASTM A416 Grade 270, with capacities reaching 2000 plus kips per anchor and practical free lengths up to 300 feet because strand bundles coil for shipping. They require a multi-strand hydraulic stressing jack and load transfer at the head is by individual wedges set into a tapered anchor block. Threadbar tendons use a single high-strength continuously threaded steel bar per ASTM A722 (Grade 75 to 150), with capacities up to approximately 350 kips for the largest Grade 150 bars. Threadbars are simpler to fabricate, install, and stress, with head transfer by a calibrated nut run down against the bearing plate. Threadbars also have the advantage of being restressable at any time during service by re-torquing the head nut. Below the 350 kip threshold and at moderate free lengths, the two configurations are functionally interchangeable; above that threshold or on tendons over approximately 100 feet, multi-strand cable anchors are the only practical option.

Not sure which system fits? We'll walk through the tradeoffs for your site conditions.

Talk Through Your Options

Where It Fits

Common Applications and Project Types

Dam abutment and spillway stabilization is the largest single market for high-capacity cable anchors, with multi-strand tendons reaching the 1000 to 2000 plus kip range used to anchor concrete monoliths and rock blocks against uplift, sliding, and overturning loads under USACE and Bureau of Reclamation dam-safety programs. Highway and railway rock-cut stabilization is the second major application, with cable anchors carrying the deep block-restraint load on jointed rock faces along transportation corridors, often paired with structural shotcrete facings and rock bolt patterns for upper-face block control. Landslide remediation and deep slope stabilization on active or historic failure surfaces uses high-capacity multi-strand anchors that transfer building, roadway, or rail loads through the failure plane to stable rock or dense soil below, frequently combined with horizontal drains for groundwater control. Foundation anchoring of high-energy rockfall barriers at EAD 340059 Class 7 and 8 (5,000 to 10,000 plus kJ) requires paired cable anchors at each post foundation, a pattern not achievable with conventional rock bolts or shorter ground anchors. Tunnel portal stabilization, mining highwall reinforcement, and bridge abutment rock-mass tie-down round out the high-end applications where multi-strand capacity and long free length are both required.

Dam abutment and spillway stabilization

Large landslide remediation and deep slope tie-down

Deep rock-mass anchoring on highway and rail cuts

High-energy rockfall barrier foundation anchorage

Tunnel portal and mining highwall stabilization

Bridge abutment rock-mass tie-down

Tall retaining wall reinforcement

Benefits

Key Advantages

Extreme Load Capacity

Multi-strand tendons reach 200 to 2000 plus kips per anchor, well beyond the practical capacity of single threadbar anchors and an order of magnitude above passive ground reinforcement.

Active Pre-Loaded Restraint

Post-tensioning applies the full design load at install through a multi-strand hydraulic jack, locking lateral or shear restraint into the structure before any wall, slope, or dam component begins to deflect.

Deep Anchorage

Practical free lengths reach 200 to 300 plus feet, allowing the bonded fixed length to seat in competent rock or dense soil far behind the active failure surface even on the deepest dam abutments and landslide remediation projects.

PTI DC35.1 Acceptance Testing

Every production anchor is proof-tested to 133 percent of design load per PTI DC35.1 acceptance criteria, with selected anchors receiving extended performance and creep testing on cohesive bond zones.

Long Service Life

PTI Class I encapsulated double corrosion protection supports 75 to 100 plus year design service lives on permanent dam, retaining wall, and rockfall barrier installations.

Engineering

Technical Considerations

Soil/Rock Conditions

Bond zone must be established in competent rock or dense soil. Geotechnical investigation determines suitable bearing stratum and required bond length. Rock bond zones develop highest unit capacity; soil bond zones require longer fixed-length runs.

Groundwater

Groundwater affects grout placement and long-term durability. PTI Class I encapsulation with grease-filled strand sheaths and a corrugated outer duct protects tendons in chloride, sulfate, or stray-current environments.

Load Capacity

Design loads governed by structural and rock-mass demand. Multi-strand configurations allow per-anchor capacity from 100 kips (4-strand) up to 2000 plus kips (30 plus strands). All anchors proof-tested to 133 percent of design load per PTI DC35.1.

Spacing

Anchor spacing determined by load distribution and structural design. Typical spacing is 8 to 12 ft for retaining walls and 10 to 20 ft for dam abutment patterns and rock-mass tie-down arrays.

Installation Method

Large-diameter rotary or rotary-percussion drilling, tendon insertion with centralizers, tremie-grouted bond zone, cement cure period, then multi-strand hydraulic stressing and wedge lock-off at the bearing plate.

Equipment Used

Track and crane-mounted rotary and rotary-percussion drill rigs
Multi-strand hydraulic stressing jacks
Grout mixing and pumping plants
Calibrated load cells and dial gauges
Anchor head assemblies and bearing plates

Limitations

Requires competent rock or dense soil for bond zone
Higher materials cost than passive reinforcement
Specialized multi-strand stressing equipment required
Alignment tolerances critical for proper load transfer

Technical Specifications

Strand Size

0.5" or 0.6" diameter (ASTM A416 Grade 270)

Capacity

100 to 2000+ kips

Free Length

20 ft to 300+ ft

Corrosion Protection

PTI Class I (encapsulated) / Class II

Codes And References

Engineering Standards and References

PTI

DC35.1

Recommendations for Prestressed Rock and Soil Anchors

The canonical industry-consensus design and acceptance reference for ground anchors in North America. Defines corrosion-protection classes (Class I encapsulated, Class II grout-protected), tendon materials, free-length and fixed-length geometry, and proof, performance, and creep test acceptance criteria.

FHWA

FHWA-IF-99-015

Geotechnical Engineering Circular No. 4: Ground Anchors and Anchored Systems

Sabatini, Pass, and Bachus 1999. The FHWA design manual for ground anchors and anchored walls on federal highway projects. Covers anchor selection, bond-length design in soil and rock, corrosion protection, and acceptance testing.

ASTM

A416

Standard Specification for Low-Relaxation Seven-Wire Steel Strand for Prestressed Concrete

The materials standard for the prestressing strand itself. Specifies the 0.5 and 0.6 inch diameter Grade 270 seven-wire low-relaxation strand bundled into multi-strand cable anchor tendons, including chemistry, mechanical properties, and relaxation requirements.

Authoritative Sources

Post-Tensioning Institute FHWA Office of Bridges and Structures ASTM International

Combinations

Integration With Other Systems

Soldier Pile Walls

Cable anchors provide tieback support for soldier pile walls on the deepest urban excavations, allowing wall heights and surcharge loads beyond what passive systems can carry.

Learn More

Structural Shotcrete

Anchors stress against shotcrete facings on rock cuts and dam abutments to create integrated structural stabilization systems.

Learn More

H-Pile Walls

Cable anchors increase the capacity and height of H-pile retaining systems on deep excavations and tall slope-toe retaining walls.

Learn More

High-Energy Rockfall Barriers

Paired cable anchors form the foundation tie-down at each post on EAD 340059 Class 7 and 8 barriers, where standard rock bolts cannot carry the impulse load.

Learn More

Expertise

Why Choose Rock Supremacy for Cable Anchors

Multi-Diameter Drilling Capability

Track and crane-mounted rotary and rotary-percussion rigs run the 6 to 12 inch diameters required for multi-strand cable anchors in fractured, blocky, and challenging rock conditions.

PTI-Trained Stressing Crews

Trained crews perform multi-strand stressing per PTI DC35.1 procedures with calibrated multi-strand hydraulic jacks, load cells, and complete documentation for owner records.

Rope-Access Drilling

SPRAT and IRATA-certified rope-access crews and in-house drill platforms allow cable anchor installation on vertical and overhanging faces where conventional crane-supported rigs cannot operate.

48-Hour Emergency Mobilization

Crews and equipment mobilize within 48 hours for emergency stabilization of failing slopes, dam structures, and post-event rockfall hazards.

PTI DC35.1 Acceptance Testing

Every anchor is proof-tested to 133 percent of design load per PTI DC35.1, with displacement and load records provided to the owner for design-of-record documentation.

Case Studies

Our Work

See how we've applied this technique and others to solve real-world geotechnical challenges.

Transportation

Glenwood Canyon, CO|2023

I-70 Corridor Stabilization

Installed 50,000 sq ft of high-tensile mesh and performed extensive scaling after a major weather event.

View Case Study

Civil

Lava Hot Springs, ID|2024

Lava Hot Springs Slope Stabilization

Multi-phase slope stabilization project protecting the historic hot springs resort and Highway 30 from an active landslide.

View Case Study

Rail

Winter Park, CO|2023

Moffat Subdivision Railroad Stabilization

Large-scale railroad stabilization project with over 10,000 linear feet of drilling to secure train tracks entering the historic Moffat Tunnel.

View Case Study

View All Work

Questions

Cable Anchors FAQ

What is a cable anchor?

A cable anchor is a post-tensioned ground anchor in which the load-bearing tendon is a bundle of seven-wire prestressing strands per ASTM A416 Grade 270, drilled into competent rock or dense soil, grouted along a defined bonded fixed length, and stressed against a bearing plate using a multi-strand hydraulic jack to lock in 200 to 2000 plus kips of holding load. Cable anchors are the high-capacity end of the post-tensioned ground anchor family, used on dam abutment stabilization, large rock-mass tie-down, deep landslide remediation, and foundation anchoring of high-energy rockfall barriers.

Cable anchor vs tieback anchor, what is the difference?

Cable anchor and tieback anchor describe the same underlying product, a post-tensioned ground anchor, but emphasize different parts of the application space. Cable anchor emphasizes the strand-tendon configuration (multi-strand bundles of seven-wire prestressing strands per ASTM A416) and is the term most commonly used on deep rock-mass anchoring, dam stabilization, and rockfall barrier foundations. Tieback anchor emphasizes the wall-mounted lateral retention application (excavation shoring, retaining walls, foundation tie-ins) and covers both strand-tendon and threadbar configurations equally. Multi-strand cable anchors dominate above 600 kips and on tendon lengths over approximately 100 feet.

What is the difference between cable anchors and rock bolts?

Cable anchors use multi-strand tendons (bundles of seven-wire prestressing strands per ASTM A416) post-tensioned to 200 to 2000 plus kips at depths of 50 to 300 plus feet, with an unbonded free length plus a bonded fixed length seated deep in stable ground. Rock bolts are shorter (4 to 25 feet), lower-capacity (20 to 100 kips) elements grouted along most or all of their length, used to tie surface blocks back to competent rock immediately behind the failure zone. Both routinely appear on the same project, with rock bolts treating the upper raveling rock face and cable anchors carrying the deep stability of the rock mass behind it.

How are cable anchors fabricated and installed?

The tendon is fabricated to project length with the unbonded free length sleeved in smooth plastic sheathing filled with corrosion-inhibiting grease, and the bonded fixed length left bare (PTI Class II) or encapsulated in a corrugated plastic duct (PTI Class I) for permanent installations. After rotary or rotary-percussion drilling of a 6 to 12 inch diameter borehole, the tendon assembly is inserted with centralizers, neat cement grout is pumped through a tremie line from the toe upward filling the bonded length, and after grout reaches design strength (typically 7 to 10 days), the anchor is stressed against a steel bearing plate using a multi-strand hydraulic jack and locked off with tapered wedges.

How long do cable anchors last?

Permanent cable anchors with PTI Class I encapsulation (double corrosion protection, each strand sheathed in grease-filled smooth plastic, plus a corrugated plastic duct sealing the bonded fixed length) are designed for 75 to 100 plus year service lives. Temporary cable anchors with PTI Class II protection (grout-protected only, no encapsulating duct) are typically used for construction-phase work with service lives of 18 to 24 months. Service life depends on corrosion-protection class, ground aggressivity, grout cover, and quality of installation.

How are cable anchors tested?

Every production anchor is proof-tested to 133 percent of design load per PTI DC35.1 acceptance criteria, with displacement readings at each load increment and a load-hold period at peak to identify creep behavior. A defined sample of anchors receives extended performance tests with cyclic loading and creep tests with longer load-hold periods, particularly on cohesive bond zones where time-dependent deformation governs long-term capacity. Tests are conducted with calibrated multi-strand hydraulic jacks and load cells, with all data recorded for owner files.

Can cable anchors be installed at any angle?

Yes. Cable anchors can be installed at any angle from horizontal to vertical, with the inclination selected based on the geometry of the failure surface, the location of the competent bond zone, structural load-transfer requirements, and access constraints. Typical inclinations on slope and dam-abutment work fall in the 15 to 45 degree range below horizontal. Vertical and overhanging installations on rockfall barrier foundations and rock-mass anchoring use rope-access crews and in-house drill platforms where conventional crane-supported rigs cannot operate.

What happens if an anchor fails the proof test?

A production anchor that fails to hold design load at 133 percent during proof testing, or that creeps beyond PTI DC35.1 acceptance limits during the load-hold period, is de-stressed and abandoned in place. Replacement or supplemental anchors are installed at adjacent locations to provide the required design capacity at the wall facing or rock-mass connection point. Test failure rates on properly designed installations are low, but acceptance testing is the mechanism that ensures every production anchor in service has been individually verified.

What standards govern cable anchor design and installation?

PTI DC35.1, Recommendations for Prestressed Rock and Soil Anchors, is the canonical North American consensus document for tendon materials, corrosion-protection classes, and acceptance testing on post-tensioned anchors. FHWA Geotechnical Engineering Circular No. 4 (FHWA-IF-99-015, Sabatini Pass and Bachus 1999) is the FHWA design manual for ground anchors and anchored walls. ASTM A416 is the materials standard for the seven-wire prestressing strand itself. AASHTO LRFD Bridge Design Specifications §11.9 governs anchored walls on state DOT bridge and highway projects, and USACE and Bureau of Reclamation dam safety programs add jurisdiction-specific requirements for prestressed rock anchors on federal dam structures.

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Methods

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