软岩大跨度长引水隧洞施工支护与地质预报  

Construction Support and Geology Forecast of Weak Rock Large-span Long-diversion Tunnel

作　　者：陈汉宝[1] 蒋丹平[1] 李瑞清[1] 

机构地区：[1]湖北省水利水电勘测设计院,湖北武汉430064

出　　处：《资源环境与工程》2009年第5期674-678,共5页Resources Environment & Engineering

摘　　要：在软岩中开挖大跨度长引水隧洞,围岩自稳性差。为了充分发挥围岩的自承能力,开挖后需及时进行初期锚喷支护,以缩短围岩应力松弛时间,使围岩变形得到有效控制而不坍塌失稳。同时应根据围岩情况及其动态来选用合适的支护形式及支护参数,对局部断层破碎带、涌水、煤层等地质缺陷地段做好地质预报,研究超前支护处理措施。Digging large-span long-diversion tunnel in weak rock, because of the poor stability of wall rock. Anchorage is required to carry out early after excavating in order to exert bearing capacity of rock sufficiently, shorten the stress relaxation time, and control rock deformation without unstable collapse. Supporting forms and parameters should be selected based on wall rock and its dynamics. Geology forecast should be proposed for geologic defects of fault of breakage, gushing water, coal seam, and so on. It is necessary to research solutions of advanced support.

关 键 词：软岩 大跨度隧洞 施工支护 地质预报 

分 类 号：TV672.1[水利工程—水利水电工程]