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中文摘要：
在经典弹塑性理论框架下，认为岩石材料在应变软化过程中遵守摩尔-库仑强度准则，塑性变形服从非关联流动法则。对两组岩石在三轴试验中呈现的应变软化行为进行了分析，获取了峰值前后强度参数的大小。采用应变软化模拟方法，将应力-应变曲线峰后应变软化阶段简化为一系列应力跌落和塑性流动的脆塑性过程，在给定的强度参数演化规律基础上，得到了岩石的应力-应变曲线、侧向应变-轴向应变曲线、体应变-轴向应变曲线和塑性体应变-轴向塑性应变曲线。模拟得到的应力-应变曲线与试验结果吻合较好，其他曲线与相关试验测试规律基本一致。研究成果对确定岩石强度参数与认识岩石峰后强度演化规律有一定的指导意义。
英文摘要：
In the framework of classic elastoplasticity theory, it is assumed that rock material abides by the Mohr-Coulomb yieldcriterion and its plastic deformation obeys the non-associated flow rule during the process of strain softening. The strength parametersbefore and after the peak are obtained by analyzing the strain-softening behaviors of two sets of rocks in the triaxial tests. Thepiecewise linear approximation is made when numerical analysis is performed under the framework of the classical theory ofplasticity. Then the strain-softening stage in the post-peak part of stress-strain curve can be simplified into a series of brittle-plasticityprocess. The stress-strain curve, lateral strain-axial strain curve, volumetric strain-axial strain curve and plastic volumetric strain-axialplastic strain curve are acquired by adopting the given strength parameter evolution laws and the strain-softening simulation method.The obtained stress-strain curves are in good agreement with those by the experiment, and the other curves are in the similar variationto those observed in experiments. The presented method and the results show that it is meaningful for determining strengthparameters and studying the evolution law of the post-peak strength from laboratory test.
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