不同应力状态下岩石蠕变全过程  

Complete process of rock creep in different stress states

作　　者：王芝银[1] 艾传志[1] 唐明明[1] 

机构地区：[1]中国石油大学城市油气输配技术北京市重点实验室,北京102249

出　　处：《煤炭学报》2009年第2期169-174,共6页Journal of China Coal Society

基　　金：国家自然科学基金资助项目(50774090)

摘　　要：基于岩石流变理论,采用解析方法和蠕变试验分析相结合,研究了不同应力状态下岩石黏弹塑性变形全过程的表述方式、对应的本构方程、蠕变方程、蠕变破坏时间、蠕变变形与破坏属性,建立了岩石三维黏弹塑性蠕变基本方程的统一格式.该统一格式可方便描述蠕变变形全过程,包括根据不同应力状态呈现出完整3阶段全过程,或其中某2个蠕变阶段组成的蠕变变形全过程.将其应用于以西原模型表述的三轴蠕变试验,建立了相应的三轴蠕变本构方程、蠕变变形公式的显式.利用某地片麻岩蠕变试验结果,验证了所建立理论模型的正确性.Based on rheological theory of rock, the expression of the complete process of viscoelasto-plastic deformation, the corresponding constitutive relationships, creep equations, creep fracture times, creep deformation and fracture properties were studied systematically using analytic method combined with creep test analysis. The unified patterns of three-dimensional viscoelasto-plastic creep equations of rock were established. The unified patterns are convenient to describe the complete process of rock creep in different stress states, no matter the process is composed by the complete three stages or by any two stages. Furthermore, the unified patterns were utilized in the triaxial creep test which were described by the Xiyuan model to establish the explicit expressions of the corresponding constitutive relationships and deformation equations. Finally, the established theoretical models were examined by using the creep test result about some gneiss.

关 键 词：应力 岩石 蠕变 

分 类 号：TU451[建筑科学—岩土工程]