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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.

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

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

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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

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Hydropower

Rampur Hydro Electric Project

SJVN’s 412 MW Rampur Hydro Electric Project is on the Sutlej in Himachal Pradesh. In loose, fissured strata with a risk of slope failure under high overburden, we carried out the rock bolting.

Completed
2013
Location
Rampur, Sutlej valley, Himachal Pradesh
Type
Hydro electric project, 412 MW
Owner
SJVN Limited

Project recordRecorded in our credentials register: rock bolting for SJVN Limited, completed in 2013.

412MW

Capacity of the hydro electric project.

2013

Work completed.

The problem

Loose strata under high overburden

  • Loose soil and weathered rock.
  • Fissures in the strata.
  • A risk of slope failure.
  • High overburden pressure.

What we did

Rock bolting

Rock bolts designed and installed to pin the loose, fissured strata to sound rock, and grouted.

Self-drilling rock bolts across a jointSection through a jointed rock face. A block above a joint that dips out of the face is pinned to sound rock by hollow self-drilling bars, each drilled with a sacrificial bit and grouted through the bar, with a plate and nut at the face. JOINTSOUND ROCKFACE123456
  1. A joint dipping out of the face: the block above it can slide.
  2. Hollow self-drilling bar with a sacrificial bit. It drills the hole and stays in it.
  3. Grout pumped through the bar fills the hole and the joints it crosses.
  4. Couplers extend the bar to the length the design needs.
  5. Plate and nut lock the face once the grout has set.
  6. A set share of bolts is pull-out tested.
Geo Constech
Rock bolting · Typical arrangement
Not a record of this site
Schematic · Not to scale

Services on this job

Methods used

Rock bolting and self-drilling anchors

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

Slope stabilisation

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

Project recordRecorded in our credentials register: rock bolting for SJVN Limited, completed in 2013.

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