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在野外实际地质条件调查的基础上,分析整理前人对锦屏有关地应力场的实测数据、模拟计算成果,研究多种地应力反演模拟手段,结合此次应力场的模拟目的,对锦屏一级水电站的地应力场进行更为细致、全面地反演计算。以II1勘探剖面为研究对象,对其进行细致概化,形成具有复杂结构的概念模型。同时,对河流下切历史进行分析,根据各阶地的下切速度和发育时间,设计岸坡线和风化线的演化过程。通过分析锦屏构造特征、地应力数据及前人的研究成果,经多次试算后确定,在VI级阶地重力场模型上,同时施加12 MPa和8 MPa的均布应力在两个垂直边界上,所得到的拟合结果最佳。对比分析模拟结果与实测地应力数据后认为,谷底应力包的量值和分布范围都有着较高精度的拟合,与前人的计算成果也有着较大的相似性。分析锦屏现今河谷地应力场特征认为,左右岸应力非对称分布,左岸受倾坡外断层、黄斑岩脉影响,应力分布情况比右岸复杂,其应力分异强烈带、卸荷范围均比右岸深。
Based on the investigation of the actual geologic conditions in the field, the measured data of previous geo-stress field of Jinping were analyzed, the results of simulation were analyzed, and a variety of ground stress inversion modeling methods were studied. Combined with the simulation purpose of this stress field, The in-situ stress field of Ping-1 hydropower station is more detailed and comprehensively calculated. Taking the II1 prospecting section as the research object, it has been carefully generalized to form a conceptual model with complex structure. At the same time, the history of river undercutting is analyzed, and the evolutionary process of bank line and weathering line is designed according to the cutting speed and development time of each terrace. By analyzing the characteristics of Jinping structure, the data of the geostress and the research achievements of predecessors, after several trial calculations, on the graded field model of class VI terraces, the uniform stresses of 12 MPa and 8 MPa are simultaneously applied to the two vertical boundaries The best fitting result is obtained. Comparing the simulation results with the measured geostress data, it is concluded that the magnitude and distribution range of the trough bottom stress package have higher accuracy fitting, which is more similar to the previous calculation results. The analysis of geotemperature field in Jinping nowadays suggests that the left and right bank stresses are asymmetrically distributed, the left bank is affected by overtopping faults and maculardock veins, and the stress distribution is more complex than the right bank. The stress distribution and the unloading range are all better than the right bank deep.