论文部分内容阅读
基于单轴压缩声发射实验,以加载中岩石的声发射和塑性体积应变为损伤变量,建立一个多参数损伤本构模型,研究了岩石的损伤演变规律。研究表明,岩石损伤本构模型和试验应力应变曲线能很好地吻合,峰值强度之前理论值略大,峰值强度之后理论值下降较快;岩石损伤随轴向应变的增加而增大,峰值强度之前岩石损伤随加载而增加,峰值强度之后岩石轴向应力减小而损伤增加;该损伤本构模型获取的应力应变曲线和损伤值能综合体现岩石的声发射和塑性体积应变的发展。
Based on the uniaxial compression acoustic emission experiment, a multi-parameter damage constitutive model was established based on the acoustic emission and plastic volume strain of the rock under loading as the damage variable. The damage evolution of the rock was studied. The results show that the rock damage constitutive model is in good agreement with the experimental stress-strain curve, the theoretical value before the peak intensity is slightly larger, and the theoretical value decreases rapidly after the peak intensity. The rock damage increases with the axial strain, and the peak intensity The rock damage increases with loading and the axial stress of the rock decreases after the peak strength, but the damage increases. The stress-strain curves and damage values acquired by the damage constitutive model can comprehensively reflect the acoustic emission and the plastic volumetric strain of the rock.