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地应力测量是获得初始地应力最直接最有效的方法,但在地应力测量打钻的过程中初始地应力会遭到扰动,岩体在打钻后出现卸载现象,初始地应力重新分布,使得测量值与实际初始地应力值有差别。本文应用有限元方法对钻孔地应力测量过程进行模拟,重点研究岩体的性质、边界应力、断裂在钻孔过程中对初始地应力变化的影响,并总结影响初始地应力变化的敏感因素。
In situ stress measurement is the most direct and effective method to obtain initial geostress, but the initial geostress may be disturbed in the process of geo-stress measurement drilling. The unloading phenomenon occurs after rock drilling, and the initial geostress is redistributed, The measured value is different from the actual initial stress value. In this paper, the finite element method is used to simulate the process of borehole stress measurement. The study focuses on the nature of rock mass, the boundary stress, the influence of fracture on the initial geostress change during drilling, and summarizes the sensitive factors that influence the initial geostress change.