论文部分内容阅读
为研究岩石峰后力学特性和本构关系,进行岩石的单、三轴压缩全程试验。基于不同阶段和不同破坏类型分别建立“分段本构模型”和“基于破坏类型的损伤软化统计模型”。分段本构模型通过屈服点、峰值点和残余强度点将岩石的应力应变划分为3个阶段,建立分段本构关系函数;基于破坏类型的损伤软化统计模型将岩石的压缩破坏划分为低围压(含单轴)下的环向张拉破坏、高围压下的剪切破坏以及中低围压下的张剪组合破坏,分别选取环向应变、剪切应变和体积应变作为损伤控制变量建立3种破坏类型的本构模型。结果表明,基于破坏类型的损伤软化统计模型能更好地描述岩石峰前及峰后的本构关系,揭示岩石内部损伤的发展过程。
In order to study the post-peak mechanical properties and constitutive relationship of rocks, single and triaxial compression tests of rock were carried out. Based on different stages and different types of damage, the “staged constitutive model” and the “damage softening statistical model based on damage type” are respectively established. The segmented constitutive model divides the stress and strain of the rock into three stages according to the yield point, peak point and residual strength point, and establishes the constitutive relation function of the section. The damage softening statistical model based on the damage type divides the rock compression compression into low confining pressure Uniaxial) under cyclic tension failure, shear failure under high confining pressure and combined shear failure under medium-low confining pressure. Three kinds of control variables, namely ring strain, shear strain and volume strain, were selected as damage control variables Destruction type of constitutive model. The results show that the damage softening statistical model based on the type of failure can better describe the constitutive relationship of the rock before and after the peak, and reveal the development process of the damage inside the rock.