考虑黏聚力与内摩擦系数的岩石黏弹塑性流变模型  

Nonlinear visco-elasto-plastic rheological model of rock with consideration of cohesion and internal friction coefficient

作　　者：杨圣奇[1] 朱运华[2] 于世海[3] 

机构地区：[1]河海大学岩土工程研究所,江苏南京210098 [2]河南理工大学安全科学与工程学院,河南焦作454000 [3]解放军理工大学理学院,江苏南京211101

出　　处：《河海大学学报（自然科学版）》2007年第3期291-297,共7页Journal of Hohai University(Natural Sciences)

基　　金：国家自然科学基金重点资助项目(50539110);江苏省博士后科研计划资助项目(0601036B)

摘　　要：基于在岩石剪切流变仪上得到的泥板岩剪切流变试验结果,采用库仑强度准则获得了岩石长期强度参数(长期黏聚力和长期内摩擦系数),与瞬时强度参数进行对比,结果表明,岩石黏聚力对时间的敏感程度高于内摩擦系数对时间的敏感程度.提出了一个考虑黏聚力和内摩擦系数随时间变化的塑性元件,将其与线性黏性元件并联起来,得到一个新的考虑黏聚力和内摩擦系数的非线性黏塑性体(CF-NVPB),同时将CF-NVPB模型与三元件线性黏弹性流变模型串联起来,建立了一个新的考虑黏聚力和内摩擦系数的岩石非线性黏弹塑性流变模型,并推导了该非线性流变模型的蠕变方程与松弛方程.Based on the shear rheological experimental result of shale obtained by rock shear rheometers, the long-term strength parameters （long-term cohesion and long-term internal friction coefficient） of rocks were obtained by Coulomb criteria. The comparison of the long-term strength parameters with the instant ones shows that the sensitivity of cohesion of rocks to time is higher than that of internal friction coefficient. A plastic component with consideration of the variation of cohesion and internal friction coefficient was put forward. By its parallel connection with the linear viscous component, a new nonlinear visco-plastic body （CF-NVPB） with consideration of cohesion and internal friction coefficient was obtained. Meanwhile, by series connection of CF-NVPB model with three-component linear visco-elastic rheological model, a new nonlinear visco-elasto-plastic rheological model with consideration of cohesion and internal friction coefficient was established, and its creep equation and relaxation equation were deduced.

关 键 词：岩石力学 黏聚力 内摩擦系数 非线性黏弹塑性流变模型 

分 类 号：TU452[建筑科学—岩土工程]