Measurement of in-situ stress in weak rocks at Mont Terri Rock Laboratory, Switzerland
Measurement of in-situ stress in weak rocks at Mont Terri Rock Laboratory, Switzerland
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DOI：
10.1016/s1365-1609(03)00113-8
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发表时间：
2003-10
影响因子：
7.2
通讯作者：
C. Martin;G. Lanyon
中科院分区：
文献类型：
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作者：
C. Martin;G. Lanyon
对粘土页岩等对环境变化反应强烈的弱岩石进行地应力测量尤其困难。在瑞士西北部的蒙特特里岩石实验室进行了一项广泛的地应力测量计划。水力压裂，利用CSIRO三轴应变仪和钻孔槽仪对直径约600毫米的井眼进行取心，以确定该位置蛋白石粘土的应力状态。测量程序导致了方向和幅度的冲突。三维弹性模型与隧道和钻孔观测相结合，建立了最可能的应力张量。目前正在使用钻孔变形计进行应力测量程序，以检查观测模型产生的应力张量。
In-situ stress measurements in weak rocks, such as clay shales, that respond strongly to environmental changes are particularly difficult. An extensive in-situ stress measurement program has been conducted at the Mont Terri Rock Laboratory in Northwestern Switzerland. Hydraulic fracturing, Undercoring around a 600-mm-diameter borehole using CSIRO triaxial strain cells and the Borehole Slotter were used to establish the state of stress for the Opalinus Clay at this location. Conflicting orientations and magnitudes resulted from the measurement programs. Three dimensional elastic modelling was used in conjunction with tunnel and borehole observations to establish the most likely stress tensor. A stress measurement program using a borehole deformation gauge is currently underway to check the stress tensor resulting from the observational modelling.