论文部分内容阅读
围压低时岩石材料表现为应变软化,其合理描述对岩石工程非常重要。在岩土破损力学的理论框架内,认为加载过程中胶结元逐渐破损转化为摩擦元,二者共同抵抗外部荷载作用,胶结元(胶结块)在破损以前的应力应变特性可以用理想的弹脆性材料描述,胶结元破损后转化成的摩擦元(软弱带)的应力应变特性可以用硬化型弹塑性模型来描述。通过引入反映破损过程的破损参数(破损率和应变集中系数),建议了一个岩石材料的二元介质模型。最后与砂岩岩样的三轴试验结果进行了对比,表明所建议的模型具有较好的适用性。
When the confining pressure is low, the rock material behaves as strain softening, and its reasonable description is very important to the rock engineering. In the theoretical framework of rock-soil damage mechanics, it is considered that the cemented carbide gradually turns into friction element during the loading process, and the two together resist the external load. The stress-strain characteristics of cemented element (cemented block) Material Description The stress-strain characteristics of the friction element (soft zone) that is transformed into cemented carbide after damage can be described by a hardening elasto-plastic model. By introducing the damage parameters (damage rate and strain concentration factor) that reflect the damage process, a binary medium model of rock material is proposed. Finally, the results of triaxial tests with sandstone samples are compared, indicating that the proposed model has good applicability.