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本文从岩体的渐进破坏特性出发,建立了考虑岩体应变软化和体积膨胀的岩体结构弹塑性分析的极限平衡方法;提出了便于分析的线性软化。膨胀弹塑性模型;并对轴对称条件下的圆形硐室进行了弹塑性极限状态分析,获得了简单明确的解答。分析结果表明:硐室围岩的塑性区发展过程存在一个破坏极限状态,而影响这个极限状态的主要因素是岩体本身的应变和体积膨胀特性。本文解答具有广泛的实用意义,其他的解答公式都能作为特例推导出来。
In this paper, starting from the progressive failure characteristics of rock mass, the limit equilibrium method for elasto-plastic analysis of rock mass structure considering the strain softening and volume expansion of rock mass is established; the linear softening that is easy to analyze is proposed. The elasto-plastic model was expanded; and the elasto-plastic limit state analysis was performed for a circular chamber under axisymmetric conditions, and a simple and clear solution was obtained. The analysis results show that there is a limit state of failure in the plastic zone development process of the surrounding rock of the chamber, and the main factor affecting this limit state is the strain and volume expansion characteristics of the rock itself. The answers to this article have a wide range of practical significance, and other solution formulas can be derived as special cases.