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Water

Tunnel water ingress controlLeaks and inflow stopped in tunnels, shafts and underground structures.Crack and joint injectionLeaking cracks and joints sealed, and structural cracks bonded, in concrete and masonry.Waterproofing and polyurea liningsPU membranes and polyurea linings for decks, tanks, tunnels and water structures.

Tunnels

Pre- and post-excavation groutingWater cut off and weak ground consolidated ahead of the face; voids closed behind it.Cavity and void fillingVoids above tunnel crowns, behind linings and under slabs filled without loading the support.Tunnel rehabilitationOld and operating tunnels: seepage stopped, ground consolidated and lining repaired, under traffic.

Ground

Track and slab re-levellingSettled ballastless track and slabs lifted back to level by PU injection, on live lines.Permeation and chemical groutingWeak, loose or wet ground strengthened and sealed by resins and gels that fill it without moving it.TAM groutingStaged grouting through sleeve pipes for shafts, foundations and deep excavations.Curtain and consolidation groutingSeepage cut-offs and foundation consolidation for dams, barrages, shafts and structures.Ground investigation and monitoringERT, GPR and MASW surveys, boreholes, lab tests and instruments, before and after treatment.

Rock, slopes and mines

Rock bolting and self-drilling anchorsRock bolts, self-drilling and prestressed anchors for tunnels, portals, slopes and caverns.Slope stabilisationSoil nails, anchors, mesh, drainage and rockfall barriers for slopes above roads, railways and towns.Mine shaft and strata treatmentWater sealed in shafts and declines; weak roof and face strata consolidated with resins and bolts.
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Railways

RailwaysSettled track, transition zones and wet tunnels on running lines.

Tunnels and metro

Tunnels and metroWater, cavities and weak ground in tunnels, shafts and metro works.

Hydropower and dams

Hydropower and damsSeepage, foundations, tunnels and slopes on hydro projects.

Mining

MiningWater in shafts and declines, and weak strata at faces and in roadways.

Water, ports and highways

Water, ports and highwaysWater tunnels and shafts, micro tunnels, pipelines, manholes and highway slopes.

Heritage and buildings

Heritage and buildingsSettlement, cracks and leaks in heritage structures and buildings in use.
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Services

Tunnel water ingress controlPre- and post-excavation groutingCavity and void fillingTunnel rehabilitationTrack and slab re-levellingPermeation and chemical groutingTAM groutingCurtain and consolidation groutingRock bolting and self-drilling anchorsSlope stabilisationCrack and joint injectionWaterproofing and polyurea liningsMine shaft and strata treatmentGround investigation and monitoring

Industries

RailwaysTunnels and metroHydropower and damsMiningWater, ports and highwaysHeritage and buildings

Sales

+91 99100 18144WhatsApp +91 99100 18144connect@geoconstech.com

Slopes

Balia Nala landslide, Nainital

Balia Nala drains Nainital lake and runs about 1.6 km to Brewery Bridge through a failing slope more than 300 m long, about 240 m high and over 200 m wide, crossed by faults. In the rains, debris flows block the nala. We worked on the slope with self-drilling anchors, grouting and geocell.

Location
Balia Nala, Nainital, Uttarakhand
Type
Landslide and slope stabilisation
Owner
Irrigation Department, Government of Uttarakhand
Stretch
About 1.6 km, to Brewery Bridge

Project recordExecuted by GCPL, as confirmed by the company in October 2026.

The problem

An active slope above a town

  • A failing slope more than 300 m in slant length, about 240 m high and over 200 m wide.
  • Faults and discontinuities crossing the slope.
  • Debris flows in the rains, jamming the nala.

Challenges

What made it hard

  • Work at altitude on an active slope.
  • Moving equipment and material up the slope.
  • Reaching different points on the slope.

What we did

Anchors, grout and geocell

  • Self-drilling anchors with grouting to reinforce the slope.
  • Geocell to protect the surface.
Stabilising a slope above a road or railwaySection of a hill slope above a road or railway. Soil nails with shotcrete hold the weathered upper slope, rock bolts pin jointed rock lower down, anchored mesh keeps loose rock on the face, drainage holes relieve water pressure and a rockfall barrier protects the line below. ROAD OR RAILWAY1234567
  1. Weathered soil and loose material on the upper slope.
  2. Soil nails or self-drilling anchors with a shotcrete or mesh facing hold the upper slope.
  3. Rock bolts pin the jointed rock lower down.
  4. Anchored mesh keeps loose rock on the face.
  5. Drainage holes take water pressure out of the slope.
  6. A rockfall barrier above the line catches what still falls.
  7. The road or railway below stays open.
Geo Constech
Slope stabilisation · Typical arrangement
Not a record of this site
Schematic · Not to scale

Services on this job

Methods used

Slope stabilisation

Soil nails, anchors, mesh, drainage and rockfall barriers for slopes above roads, railways and towns.

Rock bolting and self-drilling anchors

Rock bolts, self-drilling and prestressed anchors for tunnels, portals, slopes and caverns.

Project recordExecuted by GCPL, as confirmed by the company in October 2026.

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Seawater pouring into a micro-tunnel pit through a crack, after repeated attempts to seal it had failed. Sealed up to 85 per cent by grouting.

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