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
收藏
页码：141 / 146
页数：5
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