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Steep Slope Drilling Contractor

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Spider excavator operating on an extremely steep rocky mountainside.

Steep Slope Drilling for Challenging Terrain

GeoStabilization International is the steep slope drilling contractor of choice for corridors, bluffs, and remote sites where access, grades, or geology prevent conventional rigs from operating.

For more than 20 years, our design-build teams have executed precision drilling on extreme terrain, stabilizing slopes, anchoring rock, underpinning structures, and constructing barrier foundations, while keeping projects safe, efficient, and on schedule. With purpose-built drills, rope-assisted methods, and aerial mobilization, we deliver reliable results with minimal disruption and a light environmental footprint.

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Spider Excavator on Steep Slope Under Bridge

Our Steep Slope Drilling Capabilities

  • Soil Nails and SuperNails™: Permanent or temporary nails with mesh or shotcrete facings for slope stabilization and excavation support.
  • Rock Anchors and Dowels: Bar or strand anchors, tensioned or untensioned, for wedges, benches, headwalls, and barrier foundations.
  • Micropiles: Limited-access deep foundations for new or existing structures, including underpinning and load transfer.
  • Barrier and Attenuator Foundations: Anchor groups and post footings for rockfall fences and debris-flow barriers, designed to site-specific energy ratings.
  • Horizontal Drains and Dewatering: Drilled and launched horizontal drains to reduce pore pressures and improve long-term stability.
  • Coring and Casing Through Difficult Ground: DTH and top-hammer methods, core drilling, and temporary or permanent casing through talus, colluvium, and fractured rock.
  • Instrumentation and Monitoring: Inclinometers, piezometers, and load cells to verify system performance during and after construction.
  • Emergency Response: Rapid deployment for active slides, post-storm slope failures, and wildfire or flood-damaged corridors.

Why Choose GSI as Your Steep Slope Drilling Partner

  • Turnkey Design-Build: In-house geotechnical engineers and field crews work under one accountable team from planning through installation.
  • Purpose-Built Fleet: Spider-excavator mounted “walking” rigs, crane-basket drills, helicopter-mobile wagon drills, casing rigs, and Soil Nail Launcher™ / SuperNail™ systems for ultra-fast installation.
  • Access Anywhere: Top-down approaches, rope-assisted methods, and aerial delivery that eliminate the need for haul-road construction and reduce disturbance.
  • Low Disruption and High Control: Compact platforms, low vibrations, controlled spoil handling, and phased staging for active transportation corridors.
  • Safety and Quality Management: SPRAT-qualified personnel, rigorous testing, grout verification, and complete as-built documentation.
Spider on steep slope

Where Steep Slope Drilling Excels

 

Highways and Rail

Cut-slope stabilization, drainage, and barrier foundations within narrow rights-of-way and phased traffic control.

Pipelines and Transmission

Remote tower pads and ROW slopes accessed by spider rigs or aerial mobilization.

Coastal and River Bluffs

Anchors, nails, and drains installed with low disturbance near sensitive shorelines.

Industrial and Urban Sites

Compact rigs and low-vibration methods for interior or confined-space drilling.

Post-Event Repairs

Rapid stabilization following landslides, rockfalls, floods, or freeze-thaw cycles.

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855.579.0536

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How GSI Delivers Steep Slope Drilling

  • Assessment and Access Planning: Geologic mapping, stability analysis, and constructability evaluation to define safe top-down or rope-assisted approaches.
  • Design-Build Engineering: Selection of elements, including nails, anchors, micropiles, and drains, with defined bond lengths, diameters, and corrosion protection.
  • Mobilization and Setup: Aerial or low-disturbance access; compact working platforms and anchors for safe equipment positioning.
  • Drilling and Installation: Precision DTH, top-hammer, or coring methods with casing as required; pressure grouting and hardware integration.
  • Testing and Closeout: Proof and performance testing, grout verification, as-built records, and O&M documentation.

 

The GSI Advantage

Specialized rigs and experienced crews accelerate schedules and reduce downtime.

Integrated engineering and field execution provide predictable costs and fewer change orders.

Small rigs and aerial access minimize disturbance, spoils, and environmental impact.

Local responsiveness backed by North America’s largest steep-slope drilling fleet.

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Need a steep slope drilling contractor for a challenging or remote site? GSI’s purpose-built equipment and design-build expertise enable safe, efficient drilling where others can’t go.

Request a site assessment or proposal today.

855.579.0536

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    Our Awards, Certifications, & Memberships

    ADSC Safety Award
    GeoHazard Professionals Safety Recognition
    Gold Shovel Standard Certified
    GSI is a Directing Member of the Association of Geohazard Professionals