Maine's landslide risk is driven by marine clay deposits — the Presumpscot Formation — left behind by the postglacial sea that once covered the state's coastal lowlands, and along I-95 and coastal Route 1, this clay's sensitivity to disturbance produces sudden, retrogressive slope failures that behave very differently from the gradual creep typical of upland residual soils.
GSI sees this alongside other Steep Slope Stability Issues work across the state's infrastructure network.
Presumpscot clay's sensitivity to disturbance means GSI designs soil nail installation sequences specifically to avoid triggering the retrogressive failure this marine clay is known for, a risk generic slope repair sequencing doesn't account for. GSI's soil nailing experience informs this approach.
Because Presumpscot clay failures are triggered by pore pressure changes rather than simple saturation, horizontal drains are positioned to manage pressure at the specific depth where this marine clay's sensitivity is highest. This draws directly on GSI's Soil Nail Launcher™ work.
Conventional drilling can itself trigger the disturbance that destabilizes sensitive marine clay — the Soil Nail Launcher™'s rapid, minimal-disturbance installation is specifically suited to Maine's Presumpscot Formation. GSI's horizontal drains capability supports this step.
Where relevant, landslide emergency response is factored into the Maine project plan from day one.
Engineered for Maine's conditions. GSI's Maine repairs account for Presumpscot marine clay's unique sensitivity to disturbance — a regionally specific failure mode most slope repair methods aren't designed around. This is reinforced by GSI's work in general contractors and asset owners.
Design/build delivery. Design and build responsibility sit with one team — cutting out the delays that separate design from installation.
MaineDOT specification compliance. Engineering documentation and installation practices meet DOT standards from the earliest project submittal.
MaineDOT partners and Maine infrastructure owners describe GSI's landslide repair results.
GSI's engineers are ready to assess landslide repair conditions at your Maine site.
