Combined Sewage Storage Tunnel Shoring Project
Marathon Underground delivered complex shoring, secant shafts, microtunnelling, and underground stabilization for Ottawa’s Combined Sewage Storage Tunnel project.
Geo Construction & Ground Improvement
Canada-Wide Solutions
Marathon Underground delivers advanced geotechnical construction and ground improvement services for complex infrastructure projects across Canada. Our capabilities include consolidation grouting, compaction grouting, jet grouting, soil stabilization, cutoff wall construction, shotcrete applications, bentonite slurry support systems, and specialized ground treatment solutions.
From foundation stabilization to large-scale geotechnical enhancement programs, we provide engineered ground improvement methods that strengthen soil, control groundwater, and support safe excavation and construction in challenging conditions.
Our Geo Construction & Ground Improvement Capabilities
Consolidation Grouting
Consolidation grouting strengthens fractured rock and unstable ground by injecting cementitious grout under controlled pressure. The grout fills voids and fractures, improving ground stability and reducing permeability.
This method is widely used to reinforce foundations and stabilize rock masses prior to excavation or tunnelling.
Common Applications
- Dam and hydroelectric infrastructure
- Tunnel stabilization
- Rock mass strengthening
- Foundation support for heavy infrastructure
- Groundwater control and seepage reduction
Jet Grouting
Jet grouting is a highly versatile ground improvement technique that uses high-pressure jets of grout to mix with in-situ soil, creating columns of soilcrete that significantly improve soil strength and stability.
The process forms engineered ground elements that can support excavations, improve bearing capacity, and control groundwater.
Common Applications
- Excavation support systems
- Soil stabilization beneath structures
- Groundwater cutoff walls
- Foundation underpinning
- Ground improvement in soft or loose soils
Shotcrete Applications
Shotcrete provides structural stabilization and ground support by pneumatically applying concrete at high velocity onto rock or soil surfaces.
This method is frequently used to stabilize excavation faces, tunnel walls, slopes, and retaining structures while providing durable structural reinforcement.
Common Applications
- Tunnel and shaft stabilization
- Rock wall and soil wall support
- Slope stabilization
- Excavation support systems
- Underground construction reinforcement
Bentonite Slurry Systems for Caissons
Bentonite slurry systems provide temporary ground support during deep foundation construction. The slurry stabilizes borehole walls by exerting hydrostatic pressure that prevents collapse during drilling operations.
This method enables the safe installation of deep caissons and drilled shafts in unstable soil or groundwater conditions.
Common Applications
- Deep foundation construction
- Bridge and infrastructure caissons
- Large-diameter drilled shafts
- Projects with high groundwater levels
- Foundations in unstable soils
Soil Stabilization & Ground Improvement
Ground improvement techniques enhance soil performance by increasing strength, reducing settlement, and improving load-bearing capacity. These methods allow construction in challenging soil conditions where traditional foundations would be difficult or costly.
Marathon Underground applies engineered solutions tailored to site-specific geotechnical conditions.
Common Applications
- Infrastructure foundation support
- Settlement control beneath structures
- Ground strengthening for excavation support
- Improvement of soft or compressible soils
- Pre-construction ground conditioning for major infrastructure projects
Compaction Grouting
Compaction grouting improves ground density by injecting stiff, low-mobility grout into weak or loose soils under controlled pressure. As the grout mass expands, it displaces and compacts surrounding soils, increasing density and improving load-bearing capacity.
This technique is commonly used to mitigate settlement, stabilize existing foundations, and densify soils beneath structures or infrastructure without significant excavation.
Common Applications
- Settlement correction beneath existing structures
- Ground densification for infrastructure foundations
- Sinkhole remediation
- Stabilization of loose or collapsible soils
- Pre-construction ground improvement
Cutoff Walls
Cutoff walls are underground barriers constructed to control groundwater movement and reduce seepage through soil or fractured rock. These walls are typically formed using slurry trenching, soil mixing, or grouted barriers that create a continuous low-permeability zone below ground.
By limiting groundwater flow, cutoff walls help stabilize excavations, protect foundations, and prevent water infiltration into tunnels, shafts, and other underground structures.
Common Applications
- Groundwater control for deep excavations
- Seepage barriers for dams and levees
- Environmental containment systems
- Tunnel and shaft construction support
- Protection of infrastructure foundations
Featured Geo Construction Projects
Real-World Results. Proven Ground Improvement Performance.
From challenging soil conditions to complex underground infrastructure environments, Marathon Underground has delivered geotechnical construction and ground improvement solutions across Canada. Each project demonstrates our ability to stabilize ground conditions, strengthen foundations, and support safe construction in demanding environments. Explore a selection of projects that showcase how our expertise in grouting, soil stabilization, and geotechnical engineering helps bring complex infrastructure projects to life with confidence.
Port Hope Canadian Nuclear Laboratory Project
Marathon Underground completed marine grouting, sheet piling, and grout curtain installation for the Port Hope nuclear remediation project.
Calabogie Dam Rock Anchor Project
Marathon Underground completed specialized rock anchor stabilization and dam rehabilitation work at Calabogie Generating Station in Ontario.
Trusted Across Canada
With decades of experience supporting complex infrastructure projects, Marathon Underground provides geotechnical construction and ground improvement solutions for projects across Canada. Our teams work in urban centres, remote environments, and challenging ground conditions where stability, precision, and engineering expertise are critical.
From foundation stabilization to groundwater control and soil improvement, we deliver reliable solutions that strengthen the ground and support safe, efficient construction.
why choose marathon underground?
National Reach & Local Knowledge
Our teams operate across Canada with a deep understanding of regional soil conditions, geotechnical challenges, and regulatory requirements. This experience allows us to design and execute ground improvement programs that meet the demands of each project environment.
Turnkey Execution
From geotechnical consultation and site investigation to drilling, grouting, stabilization, and documentation, Marathon Underground delivers fully integrated ground improvement solutions tailored to project specifications.
Safety-Driven Culture
Our crews operate under rigorous safety standards and industry best practices. As a COR-certified contractor, Marathon Underground maintains a strong commitment to protecting workers, infrastructure, and surrounding communities on every project.
Engineered Ground Solutions
Every site presents unique geotechnical challenges. Our engineers and field specialists develop customized ground improvement strategies that enhance soil performance, stabilize foundations, and support long-term infrastructure reliability.
Contact Us and Let’s Talk Ground Improvement
Marathon Underground Constructors Corporation has been a trusted leader in underground infrastructure construction for over four decades.
Known for our expertise and reliability, we’ve built a reputation across the industry as the go-to contractor for complex geotechnical and underground construction projects across Canada.
Contact Marathon Underground