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我们采用小型轻便水压致裂应力测量设备对位于黄河上游的龙洋峡水电站大坝左坝肩附近的四个约100m深的钻孔进行了原地应力测量。结果表明,在所测深度范围内三向主应力之间的关系S_H>S_h>S_v,水平主应力S_H和S_h以及最大剪应力τmax的值随高程的降低有增加的趋势.由对实测孔部分压裂段的印模得出坎区S_H方向近南北。龙羊峡地区现今构造应力场复杂,S_H方向在深部为NE—NNE,浅部大致为近南北—NE向.在现今构造应力场作用下F_7断层带有复活的可能,其形式将表现为浅部逆断层型、深部右旋走滑型错动.然而,四个实测孔周围的岩体稳定性计算结果说明,处于活动断裂带以外的岩体完整部位基本上处于稳定状态。
We use a small portable hydraulic fracturing device to measure the in-situ stress of four drill holes of about 100 m in depth near the left abutment of the Longyangxia Hydropower Station on the upper reaches of the Yellow River. The results show that the relationship between the three principal stresses S_h> S_h> S_v, the horizontal principal stress S_H and S_h and the maximum shear stress τmax tends to increase with the decrease of the elevation within the measured depth range.According to the measured hole part Fracturing section of the imprint Sanken Kantang S_H direction near North and South. Now that the tectonic stress field in Longyangxia is complex, the direction of S_H is NE-NNE in the deep part and the near part is nearly near North-South-NE direction. The F_7 fault is likely to be resurrected under the current tectonic stress field. However, the calculation results of rock mass stability around the four measured holes show that the intact rock mass outside the active fault zone is basically in a stable state.