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

被引：4

作者：

Hognestad H.-O. ^{[1
]}

Kieffer S. ^{[2
]}

机构：

[1] UTT Mapei, Vallsetvegen 6, Sagstua

[2] Graz University of Technology, Institute of Applied Geosciences, Rechbauerstraße 12, Graz

来源：

Geomechanik und Tunnelbau | 2019年 / 12卷 / 02期

关键词：

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

D O I：

10.1002/geot.201800071

中图分类号：

学科分类号：

摘要：

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. © 2019, Ernst und Sohn. All rights reserved.

引用

页码：141 / 146

页数：5