【作者】 柴文革；

【导师】 高全臣；

【作者基本信息】 中国矿业大学（北京） ， 岩土工程， 2009， 博士

【摘要】 本文通过试验对岩石在围压卸载条件下的力学行为进行了研究,着重探讨了围压卸载速率对于岩石性能的影响。设计了特定的加卸载试验方式,对于岩石在加载与卸载条件下的力学性能进行了对比研究。从能量和损伤的角度对岩石破坏进行了研究,采用概率的方法建立了岩石的破坏准则。基于岩石的摩尔库仑准则,参照试验数据,建立了能够反映岩石加卸载速率影响的岩石破坏准则。基于岩石的体积应变建立了描述岩石损伤的本构模型,并采用此模型研究了围压卸载速率对于岩石损伤的影响,借助此模型研究了轴向加载与围压卸载间的差异。采用三维岩石粘弹性模型,探讨了岩石的粘弹性损伤问题。通过对围压循环加卸载试验过程中岩石吸收的能量、变形、弹性模量的研究,研究了不同围压卸载速率对于岩石造成的损伤。更多还原

【Abstract】 By studying the mechanical behaviors of rocks under confining pressuring unloading conditions, analyses have been made on the influence of the unloading rate of confining pressure on the properties of the rock. Special loading and unloading methods are designed to compare the mechanical properties of the rock in loading and unloading confining pressure. The rock failure is studied from two aspects:energy and damage. Then a rock failure criterion is established based on the method of probability. The rock failure criterion, which can reflect the influence from the loading and unloading rate, is established on the basis of Mohr-Coulomb failure criterion and the experimental data. A constitutive model, which reflects the rock failure, is established on the basis of the volumetric strain of the rock. The model is used to study the unloading rate of confining pressure on rock failure and the difference between the axial loading and the confining pressure unloading. The 3D viscoelastic model is adopted to analyze the damage on rock’s viscoelasticity. By studying the energy absorption, deformation, elasticity modulus of the rock in cyclic loading and unloading of confining pressure, the thesis analyzes the damage of different unloading rates of confining pressure on the rock.更多还原