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本文介绍了二滩坝区岩体应力场的现场研究。采用两种不同的方法进行了七个点的空间应力测量,五个点的单孔平面应力测量和两个深孔应力测量——一个孔深59.4米,另一个孔深53米。应力测量结果表明,河谷地区的应力分布具有三个区域:应力松弛区,应力集中区,应力平稳区。在深孔应力测量过程中,在孔深37.5米处成功地获得了岩芯饼状破裂临界状态下的应力值。实测最大主应力高达650公斤/厘米~2。此应力值和岩饼厚度与高应力状态下岩芯饼状破裂力学机制研究结果基本吻合。最后进行了一个剖面的线弹性有限元分析,在四个有实验数据对比的地方反演分析与实测结果基本相符。有限元反演分析勾画出了坝区岩体应力场的整体轮廓。应力场研究结果对电站枢纽布置方案的选择提供了重要依据。
This paper presents a field study of the rock stress field in the Ertanba area. Two different methods were used to measure the seven points of spatial stress, five points of single hole plane stress measurement and two deep hole stress measurements—one hole depth was 59.4 meters, and the other hole depth was 53 meters. Stress measurement results show that the stress distribution in the valley area has three regions: stress relaxation area, stress concentration area, and stress stable area. In deep hole stress measurement process, the stress value of the critical state of core cake crack was successfully obtained at the hole depth of 37.5 meters. The measured maximum principal stress is as high as 650 kg/cm~2. This stress value and rock cake thickness are basically consistent with the results of the pie-shaped fracture mechanics of rock core under high stress. Finally, a linear elastic finite element analysis of the profile was performed. The inversion analysis was basically consistent with the measured results in the four experimental data comparisons. The finite element inversion analysis outlines the overall contour of the rock mass stress field in the dam area. The stress field study results provide an important basis for the selection of power station hub layout plans.