圆形巷道完整围岩最小支护阻力计算

摘要

为研究理想弹塑性模型应力发生跌落的临界条件，引入等效应变阈值。基于弹塑性理论和Mohr-Coulomb准则，计算圆形巷道围岩的应力场、位移场和等效应变。等效应变等于等效应变阈值时，围岩处于临界破坏状态，此时确定的支护阻力为巷道围岩不发生破坏时的最小支护阻力，为巷道支护阻力选择提供一定参考。%In order to study the critical condition of the stress drop of the ideal elastic-plastic model, the equivalent effect is introduced. The stress ifeld, displacement ifeld and equivalent strain of rock of circular tunnel are calculated based on the theory of elastic plasticity and Mohr-Coulomb principle. The rock is at the critical failure state when the equivalent strain is equal to the critical equivalent strain, and the support resistance is the minimum support resistance when the rock is not damaged. Providing some reference for the selection of resistance of roadway support.