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中文核心期刊

岩土材料塑性应变增量方向的确定

Determination of the direction of plastic strain increment for geomaterials

  • 摘要: 通过与金属材料的类比,分析了岩土材料的特征面(SMP面)的特性,提出了SMP面上的应力决定岩土材料塑性应变增量流动方向的观点,并由此推导出计算公式. 通过增加一个材料参数,还可以考虑存在黏聚力时的情况. 由该公式计算的塑性应变增量方向得到了试验结果的验证.该公式也在用变换应力修正的剑桥模型中得到应用,模型预测结果能够合理反映试验数据.

     

    Abstract: As shown in a great amount of test results and theoreticalanalyses, the direction of plastic strain increment for geomaterials isdifferent from that of stress. The direction of plastic strain increment formetals is determined by the stress on its characteristic plane--octahedralplane and it is the same as the direction of stress. Based on the analogybetween geomaterials and metals as well as the concept of the characteristicplane, the direction of plastic strain increment for geomaterials can bedetermined by the direction of the stress on their characteristic plane (SMPplane). The equations for the determination of the direction of plastic strainincrement are proposed. They can be applied to the cohesivematerials by adding a material parameter. Finally these equations arevalidated by the test data. The proposed equations are also used in ModifiedCam Clay revised by transformed stress, which can simulate the test data well.

     

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