大型洞室边墙松弛劈裂区的室内和现场研究及反馈分析

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摘要中国西南的许多大型地下电站建在高山峡谷地区，该地区普遍有较高的初始地应力。若岩体呈脆性，则在地下厂房的高边墙常常产生劈裂裂缝区。通过室内试验、现场监测和分析方法来研究这一现象。首先，在实验室利用脆性似岩石材料块体开展三向加压然后一侧卸压的试验，来模拟高边墙的开挖状态，并观察到劈裂破坏现象。然后，利用前期提出的预测劈裂区公式判断工程岩体劈裂区的深度；同时，在一个洞室工程现场进行围岩松弛劈裂区和变形的观测，这里采用滑动测微计、高密度电法仪等仪器做测试。最后，结合工程现场的开挖进程开展反馈分析，在分析中采用最新建立的“能量耗散劈裂分析法”，预测后续开挖工程引起的后期围岩变形和松弛劈裂区的发展，取得了良好效果。

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关键词 ：地下工程, 地下洞室群, 劈裂破坏, 现场监测, 能量耗散, 反馈分析

Abstract：In the southwest of China，many large-scale underground power stations were built in the high mountain zone with high in-situ stress. If the rock mass behaved brittle，splitting cracks would happen on the high side wall of underground caverns. The authors tried to study this kind of phenomena adopting laboratory tests，in-situ monitoring and theoretical analysis. Firstly，laboratory tests were carried out based on brittle rock-like samples，in which loading was applied in three directions at the beginning and was removed in one direction to simulate the excavation process. The splitting phenomena appeared in the tests. Then，a criterion presented before was applied to predicting the splitting failure depth of rock mass. In-situ monitoring aiming at abserving the splitting zone and displacement of rock mass was conducted，in which sliding micrometer and electric resistivity method were adopted. Afterwards，feedback analysis was carried out combining the excavation process of caverns. The latest established splitting analysis method considering energy dissipation was adopted to predict the displacement and splitting zone of rock mass caused by the following excavation and achieved some good results.

Key words： underground engineering underground cavern group splitting failure in-situ monitoring energy dissipation feedback analysis

收稿日期: 2011-02-12

引用本文:

朱维申1，杨为民1，项吕1，李晓静2，郑文华3. 大型洞室边墙松弛劈裂区的室内和现场研究及反馈分析[J]. 岩石力学与工程学报, 2011, 30(7): 1310-1317.
ZHU Weishen1，YANG Weimin1，XIANG Lu1，LI Xiaojing2，ZHENG Wenhua3. LABORATORY AND FIELD STUDY OF SPLITTING FAILURE ON SIDE WALL OF LARGE-SCALE CAVERN AND FEEDBACK ANALYSIS. , 2011, 30(7): 1310-1317.

链接本文:

http://www.rockmech.org/CN/Y2011/V30/I7/1310

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