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基于西南地区10个大型水电工程95点空间应力测试数据与50点硐壁应力恢复法测试数据,统计分析了边坡地应力场随垂向、水平向深度变化规律,根据主应力量级、倾角变化规律分析边坡浅表部地应力场特征,探讨了西南深切峡谷地区边坡地应力场分布规律。研究表明,(1)边坡应力场在宏观上可划分为浅表部区(0~300 m)与深部区(>300 m);(2)浅表部区主应力量级、倾角波动较为剧烈,而深部区主应力量级、倾角较为稳定,其最大主应力介于15~30 MPa,中间主应力介于10~20 MPa,最小主应力介于5~12 MPa,最大、最小主应力倾角介于0°~30°,最大主应力约为最小主应力的1.5~3.5倍;(3)浅表部区地应力场具有由主应力较小、最大主应力倾角与坡角近平行转变为主应力急剧增高、最大主应力倾角变化不明显,继而转变为主应力量级、最大主应力倾角剧烈波动,最后逐渐转变与深部应力场近于一致的特征。
Based on the data of 95 points of spatial stress test and 50 points of stress analysis for 10 large-scale hydropower projects in Southwest China, the variation regularity of the ground stress field along the vertical and horizontal directions is statistically analyzed. According to the principal stress magnitude and inclination change The law of stress field in the shallow part of the slope is analyzed regularly to study the distribution of the geostress field in the slope in the southwest deep gorges. The results show that (1) the slope stress field can be divided macroscopically into superficial zone (0 ~ 300 m) and deep zone (> 300 m); (2) While the main stress in the deep area is relatively stable. The maximum principal stress is between 15 and 30 MPa, the middle principal stress is between 10 and 20 MPa, the minimum principal stress is between 5 and 12 MPa, and the maximum and minimum principal stress The dip angle is between 0 ° and 30 °, and the maximum principal stress is about 1.5 ~ 3.5 times of the minimum principal stress. (3) The surface stress field in the superficial region has the following characteristics: the principal stress is small, the maximum principal stress angle is nearly parallel to the slope angle As the main stress increases sharply, the inclination of the maximum principal stress changes insignificantly, and then changes to the magnitude of the principal stress. The inclination of the maximum principal stress fluctuates violently. Finally, the characteristics of the principal stress are almost the same.