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After a week of heavy rain, a cut slope above an access road to a residential development failed, blocking the road and threatening a row of houses at the crest. GeoCo was called in to make the slope safe and design a permanent repair. Eight weeks later the road was reopened and the new slope was already greening over.
Week one: making the site safe
Our first priority was to protect the houses and the public. We cleared the debris, installed temporary drainage and tarpaulins, and set up survey markers so we could tell immediately if the slope moved again. A quick site investigation confirmed what the water flowing from the failure surface suggested: high groundwater had saturated the slope.
The permanent repair
- Horizontal drains drilled into the slope to lower the water table permanently.
- Soil nails installed in rows across the failed area and the adjacent slope to tie the soil mass back into firm ground.
- EC Geoblock facing over the soil nailed slope, providing a durable, free-draining and plantable finish instead of bare shotcrete.
- Surface drainage rebuilt at the crest and toe, with berm drains to carry rainwater safely off the slope.
Monitoring after completion
We installed an inclinometer and standpipe piezometers so the client can see how the slope behaves through the next monsoon season. Readings so far show no movement and a steadily lower groundwater level.
Slope failures rarely wait for a convenient time. If you are responsible for a slope that is cracking, bulging or leaking water, WhatsApp our engineers for a quick assessment.
