单轴压缩下粗砂岩热损伤统计本构模型  

Statistical thermal damage constitutive model of grit stone under uniaxial compression

作　　者：邵宏甫[1] 

机构地区：[1]河南理工大学能源科学与工程学院,河南焦作454003

出　　处：《西安科技大学学报》2009年第6期702-706,共5页Journal of Xi’an University of Science and Technology

基　　金：河南省杰出青年科学基金资助项目(0612002100)

摘　　要：基于岩石的强度随机统计分布的特点及应变强度理论,应用损伤力学的相关知识,考虑微原体破坏及弹性模量与温度间的非线性关系,建立了单轴压缩条件下粗砂岩温度热损伤后统计本构模型。然后采用伺服试验机对经历了高温烘烤冷却后的粗砂岩试件进行了单轴压缩试验,并根据试验结果对粗砂岩力学参数与温度间的关系进行了讨论,给出了考虑温度热损伤的统计本构模型参数。通过与单轴压缩实验结果相对比,显示了所建模型的合理性。Based on the random statistical distribution hypothesis and strain strength theory of rock strength, a statistical thermal damage constitutive model for grit stone under uniaxial compression, which considers the nonlinear relation of unit volume failure or elastic modulus and the temperature, is established by adopting the damage constitutive theory of continuous medium. With the servo-controlled testing machine, uniaxial compressive experiment is performed on the grit stone specimens which have a experiment of high temperature heating. On the basis of experimental results of grit stone which have been heated under different high temperatures, the relation between mechanical parameters of rock material and size is temperatures, and then the parameters for statistical damage constitutive model of grit stone considering temperature effect are confirmed. The presented model is verified as reasonable and practical with comparison to experimental results.

关 键 词：岩石力学 热损伤 本构模型 

分 类 号：TU452[建筑科学—岩土工程]