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应力控制型破坏模式是高地应力脆性岩体中开挖的地下厂房洞室群常见的破坏模式,洞周松弛区就是开挖爆破和应力控制型破坏模式的产物。初始地应力作为洞周围岩变形和松弛区形成的主要外因之一,是围岩稳定分析的基础。本文对几种常用地应力反演方法进行对比分析,并介绍一种快速生成地应力场的方法,通过地应力反演结果的对比,发现该方法进行地应力场反演时,能较有效率地获得点逼近程度比较高且应力场分布规律符合常识的初始地应力场。还提出同时考虑位移监测资料和声波资料的洞周松弛区反演方法,该方法通过有限次修正洞周松弛系数,以实测位移和实测声波波速为目标,实现洞周松弛区的模拟。
The stress-controlled failure mode is a common failure mode of underground powerhouse caverns excavated in high stress and brittle rock mass, and the hole relaxation zone is the product of excavation blasting and stress-controlled failure mode. Initial stress as one of the main external causes of rock deformation and relaxation zone around the cave is the basis of the stability analysis of the surrounding rock. In this paper, we compared and analyzed several commonly used methods of geostress inversion and introduced a method of rapidly generating geostress fields. By comparing the results of geostress inversion, it is found that this method can be more efficient Get the point of approximation is relatively high and the distribution of stress field consistent with the common sense of the initial stress field. In the meantime, the inversion method of cavity-relaxation zone considering displacement monitoring data and acoustic wave data is also proposed. The method simulates the relaxation zone in the hole-circumference by aiming at the measured displacements and measured acoustic wave velocities with a finite number of corrections.