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基于深部地下勘探隧洞围岩应力型片帮破坏是岩体初始地应力作用的最直观结果的认识,建立借助围岩片帮形迹分析工程区岩体宏观地应力的估计方法。该方法通过对比分析地应力作用下多个交叉隧洞围岩的片帮空间分布特征和烈度强弱关系,建立岩体3个初始主应力的空间大小和方向关系;采用片帮劈裂纹方位角统计获得岩体最大主应力方向;依据片帮的应力门槛值和起裂应力门槛值估算出3个主应力量值。现场实测地应力数据和多工况数值计算分析都有力地表明,借助该分析方法获得的白鹤滩右岸厂址区域三维地应力是科学、合理的,这也为深入认识工程区地应力特征提供了一条新思路。
Based on the recognition of the most intuitive result of the stress of the surrounding rock mass in deep underground exploration tunnels, the method of estimating the macroscopic in-situ stress of the rock mass in the engineering area is established by means of the rock fragments. By comparing the spatial distribution features and the intensity intensity of the slabs of surrounding rock of multiple cross tunnel under the effect of ground stress, this method establishes the relationship between the spatial size and direction of the three initial principal stresses of rock mass. By using the azimuthal statistic of splitting crack Obtained the direction of the maximum principal stress of the rock mass. Based on the stress threshold and the threshold value of the cracking stress, the three principal stress values were estimated. The measured in-situ stress data and numerical calculation and analysis of multiple working conditions all strongly suggest that the three-dimensional geostress of the right bank site of Baihetan Beach obtained by this method is scientific and reasonable, which also provides an in-depth understanding of the in-situ stress characteristics of the project area New ideas.