南水北调玛柯河～阿柯河段地应力场分析研究

Study on Analysis of In-situ Stress between Akehe and Makehe of South to North Water Transfer Project

南水北调西线工程区内工程地质条件十分复杂,初始地应力场研究是决定工程设计的重要工程地质条件。借用南水北调工程区其他的现场地应力实测资料,建立的西线各个分段沿深度线性表达的地应力概化模型,得出地应力回归方程预测区间,利用玛柯河-阿柯河段有限的两个测孔地应力资料,采用均匀试验设计,全面考虑可能影响因素,同时大大减小试验次数,以最小方差作为衡量标准,分析了该段地应力的最优回归方程,即地应力和深度的具体关系式,分析了地应力大小分布规律和地质构造、地形地貌、地震断裂带、岩石力学性质等因素的关系,并给出了第一主应力沿洞轴线分布图。

The tectonic activities are very strong in areas of south-to-north water transfer west route project,where the engineering geological conditions are complicated,so it is most important for the project design to study the in-situ crustal stress field.In terms of the measurement values of in-situ stress,the model which describes the relation between in-situ stress and the depth can be set up,and the prediction interval of regression can be gotten.The uniform experimental design is adopted,with only two infinite drill information on in-situ stress measurement,and all possible factors are considered,the most optimal regression equation can be reached in terms of the least variance,and the experiment time can reduced greatly.And how the geological structures,topography,seismic fault,rock mechanical properties affect the in-situ stress are analyzed.At the same time it brings out the diagram of the first principal stress along the tunnel axial.