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力学学报  2014 

考虑轴向力和渗透力时软化围岩隧道解析

DOI: 10.6052/0459-1879-14-029, PP. 747-755

Keywords: 轴向应力,渗透力,应力-应变软化模型,逐步求解法,摩尔-库伦屈服准则

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Abstract:

为了研究轴向应力和渗透力共同作用下软化围岩的应力与位移的变化及分布规律.基于摩尔-库伦屈服准则及应力-应变软化模型并考虑轴向应力和渗透力的共同作用,将整个塑性区分为有限个同心圆环,以弹塑性交界面处的应力、应变为初始值,并采用微小径向应力增量逐步求出各个圆环上的应力应变及塑性区半径,据此重构了考虑渗透力和轴向力共同作用下软化围岩应力应变特性的逐步求解方法.利用该方法,推导出软化围岩应力应变的解.计算结果表明在考虑轴向应力作用下,塑性区半径和隧道围岩位移都随着渗透力的增加而有所减小;当轴向应力为最小主应力时,渗透力的影响更为显著.这说明渗透力的存在对于隧道围岩的应力应变分布以及塑性半径和围岩的位移有不可忽略的影响.

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