【摘要】 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。更多还原

【Abstract】 An elasto plastic softening model is set up according to strain-softening deformation characteristics of rockmass; mechanical behaviours of plastic and loose zone arouud the opening in the soft rock are also analyzed; a formula for calculating the radius of plastic zone is derived, which is more practical and has a wider application scope than Kastner formula.The results of this paper have shown that the strain-softening behaviour of rockmass has a great bearing on the mechanical behaviour of surrounding rock,the radii of plastic and loose zones and stability of the surrounding rock. Reinforcement of the rock around the openings is an effective method for controlling softening of rockmass and increase of its residual strength.更多还原