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      • Ground Improvement
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        • Cross Passages Works, Chennai Metro
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        • D-Wall, Chennai Metro
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        • Hydro Electric, Teesta
        • Hydro Electric, Sikkim
        • Flood Protection, Kollidam
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        • R.O.B, LC 101-101A
      • Soil Consolidation Works
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        • Cut & Cover BR-8, Banihal
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HomenextTunnelsnextNATM Tunneling

Projects

List of On-Going Projects
  • Tashiding HE Project
  • Teesta JG
  • Punjab Piling
  • Jal Power
  • Teesta Slope Stabilization
  • Koldam Project
  • Kollidam Project
  • JK Rail T-77B_T-77C
  • JK Rail BR-4
  • JK Rail 144B-144C
  • JK Rail BR-8
  • Chennai Metro Project
  • Bangalore Metro Project
  • Patna LC_74 Project
  • Punatsangchhu-I Projects
  • Cross Passages JG

NATM Tunneling

The New Austrian Tunnelling method (NATM) was developed between 1957 and 1965 in Austria. It was given its name in Salzburg in 1962 to distinguish it from old Austrian tunnelling approach. The main contributors to the development of NATM were Ladislaus von Rabcewicz, Leopold Müller and Franz Pacher. The main idea is to use the geological stress of the surrounding rock mass to stabilize the tunnel itself.

The NATM integrates the principles of the behaviour of rock masses under load and monitoring the performance of underground construction during construction. The NATM is not a set of specific excavation and support techniques and has often been referred to as a "design as you go" approach to tunnelling providing an optimized support based on observed ground conditions but more correctly it is a "design as you monitor" approach based on observed convergence and divergence in the lining as well as mapping of prevailing rock conditions.

NATM Tunneling

Geo Technical Specialised Works

    Foundation Engineering

  • Secant Piling
  • Bored Piling
  • Soldier Piling
  • Sheet Piling
  • Micro Piling
  • King Post
  • Diaphragm Wall

    Ground Improvement

  • Jet Grouting
  • Permeation Grouting
  • Chemical Grouting
  • TAM Grouting
  • Compaction Grouting
  • Cavity Grouting

    Slope Stabilitation

  • Ground Anchors
  • Pile Anchors
  • Soil Nails
  • Rock Anchors
  • Rock Bolt
  • Short Crete

    Other Specialised Works

  • Cut & Cover
  • Cross Passenge
  • Pipe Roofing
  • Trussel Brg
  • Guide Wall
  • Quality Control
  • Core Sampling

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