Rock, slopes and mines
Slope stabilisation
A slope fails when water pressure rises and the ground loses strength along a weak plane. We reinforce it with nails and anchors, hold the surface with mesh or shotcrete, take the water out and catch what may still fall, so the road, railway or town below stays safe.
When to call us
The signs
- Cuttings and portals above roads and railways.
- Landslide zones and active hill slopes.
- Weathered soil over jointed rock.
- Slopes that move after every monsoon.
- Rockfall onto a line or a road.
- 1Note 1: Weathered soil and loose material on the upper slope.
- 2Note 2: Soil nails or self-drilling anchors with a shotcrete or mesh facing hold the upper slope.
- 3Note 3: Rock bolts pin the jointed rock lower down.
- 4Note 4: Anchored mesh keeps loose rock on the face.
- 5Note 5: Drainage holes take water pressure out of the slope.
- 6Note 6: A rockfall barrier above the line catches what still falls.
- 7Note 7: The road or railway below stays open.
How we do it
Method, step by step
Investigate
Geology, joints, water and the way the slope is failing.
Design
Nails, anchors, facing and drainage, with stability checked for the design case.
Install from the top down
Nails or self-drilling anchors, grouted, and the facing placed as each lift is exposed.
Drain
Drainage holes and surface drains take water pressure out of the slope.
Protect
Anchored mesh, drapery and rockfall barriers where loose rock remains.
Monitor
Inclinometers, piezometers and survey points where the slope is active.
What we use
Made at our plant in Alwar
Quality
Checks and proof
- Nail and anchor tests to the design load.
- Drainage flows checked after rain.
- Movement monitored where the slope is active.
On record
Where we have done it
Balia Nala landslide, Nainital
A failing slope over 300 m long and 240 m high, crossed by faults, above the town’s lake outlet. Anchored, grouted and protected.
Rampur Hydro Electric Project
Rock bolting in loose, fissured strata on a 412 MW hydro project in the Sutlej valley.
Questions
What clients ask
Soil nails or anchors?
Soil nails are passive: they take load as the ground moves slightly. Prestressed anchors are active: they are tensioned to hold the ground before it moves. The choice depends on the ground, how much movement the structure above can take, and the loads.
How important is drainage?
Very. Rising water pressure is the most common trigger of slope failure, and reinforcement without drainage often fails at the next heavy rain.
Related services
Often used together
Rock bolting and self-drilling anchors
Rock bolts, self-drilling and prestressed anchors for tunnels, portals, slopes and caverns.
Ground investigation and monitoring
ERT, GPR and MASW surveys, boreholes, lab tests and instruments, before and after treatment.
Curtain and consolidation grouting
Seepage cut-offs and foundation consolidation for dams, barrages, shafts and structures.
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