矿业科学学报2018，Vol.3Issue(2)：165-170,6.DOI:10.19606/j.cnki.jmst.2018.02.008
三轴压缩下砂岩统计损伤本构模型探究
Research on the statistical damage constitutive model of sandstone under triaxial compression
摘要
Abstract
Based on the triaxial compression tests of sandstone under constant confining pressures, stress-strain curves under different confining pressures were obtained. Based on the volumetric strain of cracks in the compression process, damage variable was defined and the increment of the volumetric strain of cracks was assumed to follow Weibull distribution. In consideration of the nonlinear elastic properties and the effect of residual stress in the process of rock compression, and based on strain equivalence hypothesis, the statistical damage constitutive model of sandstone under triaxial compression was deduced theoretically. The theoretical model was verified by experiments, and the physical meaning and change laws of each model parameter under different confining pressures were also discussed. The research results show that the model is correct and reasonable.关键词
裂隙体积应变/威布尔分布/非线性弹性性质/残余应力/统计损伤本构模型Key words
volumetric strain of cracks/Weibull distribution/nonlinear elastic properties/residual stress/statistical damage constitutive model分类
建筑与水利引用本文复制引用
韩心星,杨小彬,刘恩来,王朋浩..三轴压缩下砂岩统计损伤本构模型探究[J].矿业科学学报,2018,3(2):165-170,6.基金项目
国家自然科学基金(50904071,51274207) （50904071,51274207）
