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本文根据岩体应变软化的变形特性,建立了弹塑性软化模型;分析了软岩巷道围岩塑性区和破碎区的力学性态;推导出比卡斯特纳(Kastner)公式更符合实际、适用性更广泛的塑性区半径计算公式,即本文结果表明:岩体的应变软化特性对围岩的力学性态、塑性区大小、破碎区大小以及围岩的稳定性都有巨大的影响。在巷道围岩中进行内加固,控制岩体的软化程度,提高其残余强度是一种有效的支护方法。
In this paper, the elastic-plastic softening model is established according to the strain-softening deformation characteristics of rock mass. The mechanical behavior of the plastic zone and the crushing zone is analyzed. The Kastner’s formula is deduced to be more practical and applicable The results show that the strain softening characteristics of rock mass have a great influence on the mechanical properties of surrounding rock, the size of plastic zone, the size of crushing zone and the stability of surrounding rock. It is an effective support method to carry out internal reinforcement in the surrounding rock of the roadway, to control the softening degree of the rock mass and increase its residual strength.