Pre-excavation grouting in rock tunneling: Dealing with high groundwater pressures

Hans-Olav Hognestad, Daniel Scott Kieffer

Research output: Contribution to journalArticle

Abstract

In rock tunneling, pre-excavation grouting (or, pre-injection) refers to systematic treatment of the rock mass ahead of an advancing tunnel face via pressure grouting. The main purpose of pre-excavation grouting is to reduce water inflows, or to improve geomechanical properties of the rock mass. This paper summarizes approaches for treating competent rock masses with systematic pre-injection of cementitious grouts through boreholes drilled from the working tunnel face. The focus is on traditional cement based grouting technology and drill-and-blast tunneling under high static groundwater pressures (> 20 bar). Post-injection, where drilling and grouting is performed somewhere behind the tunnel face, provides an additional means for achieving a high degree of watertightness, but is beyond the scope of this paper.

Original languageEnglish
Pages (from-to)141-146
Number of pages6
JournalGeomechanics and Tunnelling
Volume12
Issue number2
DOIs
Publication statusPublished - 1 Apr 2019

Keywords

  • Conventional tunnelling
  • Drainage and sealings
  • ground improvement
  • Grouting
  • high groundwater pressure
  • pre-injection
  • rock tunneling

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology
  • Civil and Structural Engineering

Fields of Expertise

  • Sustainable Systems

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