基于压密和损伤函数复合作用的单轴压缩本构关系

发布时间：2018-05-13 17:41

本文选题：单轴压缩 + 声发射　；参考：《金属矿山》2016年06期

【摘要】：对西部钙泥质胶结砂岩进行单轴压缩实验。考虑压密阶段和损伤阶段应力应变曲线的变化特点,分别将压密阶段的体积应变和加载过程中的声发射累计数作为表征压密状态和损伤状态的参量,进行归一化后分别用于描述压密和损伤特征,并选取Logistic函数和指数函数进行回归拟合得到加载过程中的压密函数和损伤函数。结合试件的弹性变形特点,对压密函数和损伤函数进行线性组合,分别对由载荷控制和位移控制(包括峰前和全过程)的单轴压缩实验得到的应力应变曲线进行回归分析,得到了砂岩在单轴压缩条件下与实验结果相关性较高的的本构方程,并分析了压密函数和损伤函数中参数的物理意义。
[Abstract]:Uniaxial compression experiments were carried out on calcareous cemented sandstone in the west of China. Considering the characteristics of the stress-strain curves in the compaction and damage phases, the volume strain in the compaction stage and the acoustic emission accumulative count in the loading process are taken as the parameters to characterize the compaction state and the damage state, respectively. After normalization, they are used to describe the characteristics of compaction and damage respectively, and the Logistic function and exponential function are selected for regression fitting to get the compression function and damage function in the loading process. According to the elastic deformation characteristics of the specimen, a linear combination of the compaction function and the damage function is carried out, and the stress-strain curves obtained from the uniaxial compression experiments controlled by load and displacement (including the peak and the whole process) are regressed respectively. The constitutive equation of sandstone under uniaxial compression is obtained and the physical meaning of the parameters in the compaction function and damage function is analyzed.
【作者单位】：深部金属矿山安全开采教育部重点实验室;东北大学资源与土木工程学院;黑龙江省煤矿深部开采地压控制与瓦斯治理重点实验室;
【基金】：国家重点基础研究发展计划(973计划)项目(编号:2013CB227902) 国家自然科学基金项目(编号:51574059;51404067;51574060)
【分类号】：TD315

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