隐伏非贯通结构面剪切蠕变特性及本构模型研究  

Shear creep characteristics and constitutive model of hidden non-persistent joints

作　　者：李任杰 吉锋 冯文凯 王东坡 张津铭 LI Ren-jie;JI Feng;FENG Wen-kai;WANG Dong-po;ZHANG Jin-ming(State Key Laboratory of Geohazard Prevention and Geoenvironment Protection,Chengdu University of Technology,Chengdu 610059,China)

机构地区：[1]成都理工大学地质灾害防治与地质环境保护国家重点实验室

出　　处：《岩土工程学报》2019年第12期2253-2261,共9页Chinese Journal of Geotechnical Engineering

基　　金：国家重点研发计划项目（2017YFC1501003）;四川省科技计划资助项目（2018JY0471）;四川省青年科技创新研究团队项目（2017TD0018）

摘　　要：结构面控制岩质边坡失稳的边界,自然界中大量结构面是非完全贯通的,且隐藏在斜坡内部,非贯通结构面研究对于揭示斜坡启动破坏机理及稳定性具有重要意义。隐伏非贯通结构面的岩块取样困难且不能大量复制,通过室内制作一种隐伏非贯通结构面模型,在单轴压缩试验和剪切试验的基础上,采用YZJL-300型岩石剪切流变仪,对隐伏非贯通结构面岩体进行剪切蠕变试验,并对蠕变特性进行研究。根据蠕变试验的阶段特征,引入一个适用于结构面的非线性黏性加速元件和材料损伤变量,建立一种非贯通结构面的剪切蠕变损伤本构模型,并根据拉普拉斯变化推导三维剪切蠕变本构方程。利用L-M算法和全局优化法对所得的蠕变试验曲线进行辨识,求解模型参数。经过辨识并对比试验结果和模型拟合结果,新建立的本构模型能较好地反映非贯通结构面蠕变特性,对揭示岩质斜坡的长期稳定性和时效演化有借鉴意义。The joints control the boundary of the rock slope instability. A large number of joints in the natural world are not completely persistent, and are hidden inside the slope. The study on the hidden non-persistent joints is of great significance for revealing the failure mechanism and stability of the slope. The rock specimens with natural hidden non-persistent joints are difficult to sample and cannot be replicated in large quantities. A model experiment on the rock mass with hidden non-persistent joints is made in laboratory, which is similar to the reality. Based on the uniaxial compression tests and direct shear tests, the shear creep tests and creep characteristics of rock mass with hidden non-persistent joints are carried out by using the YZJL-300 rock shear rheometer. According to the creep test results, based on the creep stage characteristics and previous researches on the creep constitutive model, a new constitutive model for the shear creep damage is established by introducing a non-linear viscous accelerating element and a material damage variable suitable for joints. Because the rock mass is in the three-dimensional stress condition under actual conditions, in order to be better applied to the actual engineering, the three-dimensional state of the constitutive model is generalized. The obtained creep test curve is identified by the L-M algorithm and global optimization method to solve the model parameters. By identifying and comparing the test results and model fitting results, the new constitutive model can better reflect the creep characteristics of rock mass.

关 键 词：隐伏非贯通结构面 剪切蠕变试验 加速元件 蠕变损伤本构模型 

分 类 号：TU451[建筑科学—岩土工程]