Sinkhole Repair

Sinkhole Repair

Sinkhole repair addresses voids and loosened ground, along with any damage to foundations above them. We coordinate ground treatment and structural support around the site investigation and repair design.

Overview

Engineered Sinkhole Repair

Sinkhole repair starts with identifying the disturbed ground and how it affects the structures above it. The investigation informs whether the work requires ground treatment, structural support, excavation, or a combination.

Compaction grouting displaces and densifies loose soil. Other grouting methods can fill voids or seal water paths. Injection pressure, volume, and ground movement are monitored against project-specific limits.

Where a foundation has lost support, micropile underpinning can transfer its loads beyond the disturbed zone. Access, drilling, structural connections, grout strength, and load testing are coordinated with the engineer of record.

Other repair scopes include sealing the connection to a deeper void, constructing a structural cap, or excavating and replacing affected ground. The investigation and design determine which approach is appropriate.

For a construction review, share the site location, investigation reports, structural assessments, repair drawings, access constraints, and schedule. Discuss insurance documentation requirements with your insurer and engineer before defining the construction records needed.

Equipment

Tools & Technology

We deploy specialized equipment matched to project requirements and site conditions.

High-pressure compaction grout pumps
Low-headroom drill rigs
Ground penetrating radar (ASTM D6432)
Track-mounted SPT and CPT rigs
Real-time pressure and volume monitoring
Hydraulic jacking and load-test frames
Why Us

Why Choose Rock Supremacy for Sinkhole Repair

Diagnosis-first approach, treatment is designed to match the failure mode rather than applied as a default scope
Repair methods include compaction grouting, throat sealing, underpinning, capping, and excavation with engineered fill
Real-time pressure, flow, and volume monitoring on every grout injection to prevent heave and confirm treated extent
Low-headroom equipment supports underpinning where building access permits
Underpinning load testing coordinated with the project engineer
Construction records for the owner and engineer of record
Questions

Sinkhole Repair FAQ

Sinkhole repair is the engineered diagnosis, treatment, and verification of ground subsidence or collapse features caused by carbonate bedrock dissolution, raveling overburden, or man-made void formation around broken utility lines. Five remediation methods cover the great majority of installed work: compaction grouting, bedrock throat sealing, structural capping, micropile underpinning, and excavation with engineered fill. The correct combination is set by the geotechnical investigation, by the depth and geometry of the affected column, and by the condition of the structure above. Repair closes with verification borings or load tests and a sealed engineering report for insurance and structural records.
Most sinkholes form by dissolution of carbonate bedrock, primarily limestone and dolomite, by mildly acidic groundwater. Over time the dissolution opens channels and cavities in the rock. The overburden above either ravels gradually into those openings, producing slow surface settlement (cover-subsidence), or bridges over a pre-existing cavity until the bridge fails (cover-collapse). A separate failure mode, dropout, is driven by soil eroding into a broken sewer, stormwater, or water line and creating a void that eventually surfaces. Florida, the Tennessee Valley, central Pennsylvania, and large parts of the Southeast are the dominant US karst regions, but localized dropouts can occur anywhere with aging buried utilities.
Cost depends on the investigation, the extent and depth of disturbed ground, access, and whether the structure needs underpinning as well as ground treatment. Investigation, construction, testing, and restoration should be defined in the estimate. Share the available reports and repair plans for a scope review.
Long-term repair depends on identifying the ground failure and treating both the void or loosened ground and any affected structure. The repair design should address groundwater, load transfer, corrosion protection, and follow-up monitoring. The selected system and site conditions determine its service requirements.
Compaction grouting injects a stiff grout that displaces and densifies loose ground around the injection point. Treatment is staged and monitored for pressure, volume, and ground movement. The engineer sets the injection limits and sequence to suit the ground and nearby structures.
We open every project with a geotechnical investigation that combines three tools. Standard penetration test (SPT) borings on a designed pattern locate the raveling column, identify any voids, and confirm depth to competent bearing material. Cone penetration testing produces a continuous profile of soil response where SPT spacing leaves gaps. Ground penetrating radar per ASTM D6432 maps shallow voids non-intrusively across the affected area. The structural engineer combines the geotechnical findings with a foundation assessment to set the treatment plan: which method or combination of methods, the injection pattern, the underpinning layout, and the verification protocol.
Coverage and documentation requirements depend on the policy, location, and cause of the damage. Contact your insurer about the investigation and repair records it needs. We can discuss construction documentation with you and your engineer.
The schedule includes investigation, repair design, construction, testing, and restoration. Ground treatment and structural underpinning may be separate stages, with curing and load testing affecting the sequence. We can discuss a construction schedule once the scope is defined.
Foundation repair is the umbrella scope of work performed on a damaged or inadequate foundation, including underpinning, crack repair, slab leveling, and waterproofing. Sinkhole repair specifically addresses the subsurface void or raveling column that caused the foundation problem, by densifying overburden, sealing the bedrock throat, and restoring bearing capacity. The two scopes routinely combine. On a settled foundation over a karst feature, sinkhole repair densifies the raveled column and seals the throat, then [foundation underpinning](/techniques/foundation-underpinning) transfers the structural load past the disturbed zone into competent bearing material. Treating only the foundation symptom without addressing the subsurface cause leaves the failure mechanism intact.
Treat any new sinkhole, surface depression, or rapidly widening crack near the structure as a potential safety event. Evacuate the affected area, keep people and vehicles back from the rim, and call a licensed structural engineer and a sinkhole contractor for emergency response. Do not attempt to fill the depression with soil, debris, or concrete from the surface, since that can mask the true geometry of the failure and complicate later remediation. Photograph the feature from a safe distance, note the date and time it appeared, and contact your homeowners insurance carrier. Our emergency response coordinates with the structural engineer of record from the first call.
Testimonials

What Our Clients Say

We take pride in building lasting relationships with our clients through exceptional service and results.

"It amazes me how quick these guys adapt to challenging and seemingly overwhelming construction situations in the best, and most creative approach. Very smart, dedicated, hardworking group of brave workers in hazardous work sites. Not the type of work just anyone can do! Keep up the good work!"
A
Anthony Laitta
Google Review
"When it comes to heavy foundation anchoring and stabilization projects, these guys are superb. Although the majority of the company's jobs involve heavy civil work, my project required their skills and specialized equipment for a challenging residential cliffside application. After careful review and critique of our plans, as well as assuring that expectations were fully understood, the work began on time and was completed ahead of schedule with minimal trauma along the way. In all, the job required the installation of ten horizontal deep rock anchors, several vertical piles, and shotcrete encapsulation. I highly recommend Rock Supremacy's services and would definitely use them again."
D
David
Google Review
Residential Slope Stabilization
"We engaged Rock Supremacy for a very challenging cliffside project that involved the stabilization and reinforcement of a retaining wall which ultimately required a total of ten drilled horizontal rock anchors, multiple vertical stabilization pilings and encapsulation with concrete structural reinforcement. Even though my residential project, as large as it was to me, was of a much smaller scale than the company often deals with, it approached the task with all of the consideration and professionalism I could hope for. Notably, they were not hesitant to take on a challenging terrain even with its limited access. From the outset, Corey Muir was very engaged in the project and with finding workable solutions. He was eager to explore alternative options for accomplishing the goals and worked diligently with my engineering consultants to tweak the design for a practical, affordable solution. Throughout the planning process, he maintained excellent communications with myself and our structural engineers. Corey was careful to make sure, prior to our final agreement, that all details were fully understood. The company began the project exactly when anticipated. The on-site crew, David, Nate and Jules proved to be the "A" team. They are very skilled and professional. I found them considerate, easy to interact with, and flexible with regard to change possibilities. The team showed careful concern for my property and all possible avoidance of collateral damage while completing a job that involved some very heavy equipment. When the concrete supplier was unduly delayed, they took it in stride and made the best of the situation. The job was actually finished a little ahead of schedule. Definitely a five star rating for this group, I would be happy to further discuss my experience with anyone contemplating the use of Rock Supremacy's services."
D
David Stellway
Residential Client
Residential Slope Stabilization
Contact

Deploy Us

Ready to discuss your sinkhole repair needs? Our team can assess your site conditions and provide a custom solution.

Emergency (24/7)

(541) 383-7625

Bidding & Estimates

Info@RockSupremacy.com

Headquarters

Western Division (HQ)
65147 N Hwy 97
Bend, OR 97701
(541) 383-7625
Eastern Division
915 Millennium Ct
Blountville, TN 37617
423.830.ROCK (7625)

Include any licensing, insurance, and crew qualification requirements in your inquiry so we can review them for the project.

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