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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.
All services →Grouts and resins we make →

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

Ground

Ground investigation and monitoring

Most ground problems show in one place and start in another. We survey the ground before we treat it, to find the wet, soft or hollow zones that explain what is happening at the surface, and survey it again afterwards to measure the change.

Request a site inspection See T-46 P2

When to call us

The signs

  • Settlement with no obvious cause.
  • Planning a grouting or stabilisation job.
  • Proving the result of a treatment to an owner.
  • Watching an active slope or a structure that is moving.
Surveying the ground under a trackLong section of a track and its formation. ERT electrodes, MASW geophones with a hammer source and a GPR cart run along the surface; below, a wet, soft zone and a void show up; a borehole, a piezometer and an inclinometer confirm and monitor it. 1234567
  1. ERT electrodes map wet, low-resistivity ground.
  2. MASW geophones and a hammer source map shear-wave velocity: how stiff the ground is.
  3. GPR finds voids and layer changes close to the surface.
  4. The weak, wet zone under the track shows up in both surveys.
  5. Boreholes and laboratory tests confirm what the surveys show.
  6. Piezometers and inclinometers watch water pressure and movement.
  7. The survey is repeated after treatment to measure the change.
Geo Constech
Ground investigation · Long section
Schematic · Not to scale

How we do it

Method, step by step

  1. ERT

    Electrical resistivity tomography maps wet, low-resistivity ground and water paths.

  2. MASW

    Multichannel analysis of surface waves maps shear-wave velocity, a direct measure of stiffness.

  3. GPR

    Ground-penetrating radar finds voids and layer changes near the surface.

  4. Boreholes and laboratory tests

    Confirm what the surveys show and give design values.

  5. Monitoring

    Piezometers, inclinometers and movement monitoring.

  6. Repeat after treatment

    The same survey repeated to measure the change.

What we use

Instruments, not grout

Surveys are carried out with our own engineers and instruments, before and after treatment.

Quality

Checks and proof

  • Survey lines and depths set for the question being asked.
  • The same lines repeated after treatment, for a like-for-like comparison.

On record

Where we have done it

Railways · Sangaldan, J&K

T-46 P2, Sangaldan, USBRL

Ballastless track that settled further every monsoon, lifted back to its design profile on a live line, with the ground beneath made stable.

Certified

Questions

What clients ask

Why survey after the treatment as well as before?

Because grout take tells you what went into the ground, not what changed. On T-46 P2 a second MASW survey after grouting confirmed the gain in ground stiffness.

Which survey do I need?

It depends on the question: ERT for water, MASW for stiffness, GPR for voids near the surface. Two are often combined. On T-46 P2, MASW showed low-stiffness zones exactly where the settlement was greatest.

Related services

Often used together

Track and slab re-levelling

Settled ballastless track and slabs lifted back to level by PU injection, on live lines.

Slope stabilisation

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

Permeation and chemical grouting

Weak, loose or wet ground strengthened and sealed by resins and gels that fill it without moving it.

Seeing this on your site?

Send us what you see, where, and the access or traffic window. An engineer reviews it and replies with the next step.

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