ASSESSMENT AND PREDICTION OF GEOHAZARDS OF THE DEEP-LYING LONG TUNNEL IN THE YUANLIANGSHAN
HUANG Run qiu 1, GOU Ding cai 2, QU Ke 2, XU Mo 1, XU Ze min 1 (1.Chengdu University of Technology, China; 2.Survey and Design Institute of Railways, China)
The projected Yuanlianshan tunnel is a long tunnel about 10 km with a buried depth of 500~1000 m. It is a key project on the Chongqing Huaihua railway line. As it passes through various geologic units, it can be generally forecasted that geological hazards, such as water gushing out, rockburst induced by high geostress and other hazardous phenomena will be arise in the construction of the tunnel. Engineering geological surveys and some deep holes explorations reveal that most of the tunnels will be excavated in carbonate rocks which constitute a syncline and anticline with well developing superficial karst system. The authors focus the problems on the water gushing out and the large deformation of surrounding rocks related to soft rocks in some segments of the tunnel. According to some basic data from investigation, the authors analyze the mechanism of these hazards and predict their potential risks. The possible countermeasures are also suggested in this paper.
【CateGory Index】： U456.33