巴贡水电站引水洞地应力测量及分析  

In-Situ Geostress Measurement and Analysis for the Power Tunnel of Bakun Hydroelectric Station

作　　者：汪安全 艾凯[2] 尹健民[2] 

机构地区：[1]中国水电建设集团公司,北京100048 [2]长江科学院水利部岩土力学与工程重点实验室,武汉430010

出　　处：《长江科学院院报》2013年第6期72-75,79,共5页Journal of Changjiang River Scientific Research Institute

基　　金：国家重点基础研究发展计划(973)项目(2011CB710603);水利部公益性行业科研专项项目(201001009);中央级公益性科研院所基本科研业务费项目(CKSF2011020/YT)

摘　　要：为了评价马来西亚巴贡水电站引水发电洞衬砌方案的可靠性,在引水发电洞沿线3个不同部位采用水压致裂法进行了地应力测试,并结合地质条件进行了有限元回归分析,获得了隧洞沿线岩体初始应力分布。最后从地应力角度,论证了高压隧洞衬砌设计方案。结果表明:隧洞沿线岩体应力状态主要受地形控制,引水隧洞前段围岩最小主应力大于内水压力的1.3倍,满足围岩抗裂设计的要求,该洞段可采用钢筋混凝土衬砌。To assess the reliability of the lining design for Bakun Hydroelectric Station＇ s power tunnel in Malaysia, the in-situ geostress at three positions along the tunnels were measured by hydro-fracturing method.Finite element regression analysis was carried out on the test results in consideration of the in-situ geological condi-tions. The initial rock mass stress distribution along the tunnel axis was obtained. Moreover, the design schemes for the lining of high-pressure tunnel were discussed in terms of in-situ stress. The results reveal that the stress of rock mass above the riverbed at the three positions are not high. The rock mass stress is mainly subjected to the topogra-phy. The minimum principal stress of the surrounding rock in the upper section of the headrace tunnels is 1.3 times greater than the internal water pressure, which meets the design requirement of crack prevention, thus the steel lin-ing could be replaced by reinforced concrete lining.

关 键 词：地应力 水压致裂法 引水发电洞 衬砌 

分 类 号：TV223.3[水利工程—水工结构工程]