巴基斯坦N-J项目地下工程超长隧洞施工方案探讨

Discussion on Construction Scheme of Underground Overlength Tunnel Progect of N-J Engineering in Pakistan

巴基斯坦N-J项目超长遂洞工程具有工程量大、地质结构复杂、围岩不稳定、洞挖面积小、地应力高及地下渗水严重等特点,其施工难道高,安全要求高。分别对该隧洞开挖及支护进行了描述,并提出了工程防水治水及防围岩坍塌的关键技术措施。

There are some characteristics of the overlength tunnel project of N-J engeering in Pakistan,which include work large,complicated geological structure,unstable wall rock,little area for excavation,high underground stress,and it′s serious penetrative groundwater.Because of these,it′s very difficult for construction,and very strict to safety.The digging and support method is described in this paper,and the pivotal measures about water proof and control,avoiding wall rock collapsing are introduced at last.