Tunnel excavation through confined sand aquifer and effective use of seepage water

被引：0
|
作者：
Imazu, M [1 ]
Mori, N [1 ]
Okuda, M [1 ]
Maeda, M [1 ]
Nishi, J [1 ]
机构：
[1] Shimizu Corp, Tokyo 135, Japan
来源：
CHALLENGES FOR THE 21ST CENTURY, VOL. 2: COMMUNICATION TUNNELS/MISCELLANEOUS INCLUDING WATER TUNNELS/MECHANISED TUNNELLING | 1999年
关键词：
D O I：
暂无
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
A great obstacle to excavation was a highly confined sand aquifer. Preliminary borings from ground surface revealed the existence of an alternation of a highly cor;fined sand aquifer with a water pressure of 1.4 MPa, gravel and mudstone ahead of the working face. In order to determine the location of the stratum and lower the groundwater level, vertical drainage holes were drilled downward from the tunnel floor. Then, in addition to vertical drilling, horizontal holes were also drilled with the aim of draining the ground ahead of the face. Drainage drilling was incorporated into the tunnel excavation cycle. This paper reports on tunnel construction (1) in the confined sand aquifer section, (2) in the swelling ground section, (3) in the unconsolidated sand strata section, and (4) using groundwater flowing in the tunnel for irrigation.
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页码：695 / 702
页数：4
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