考虑孔隙水压的岩体蠕变本构模型  

On Constitutive Model of Rock Mass Creep Considering Pore Water Pressure

作　　者：欧阳蕊灿 王卫军 袁超[1,2] OUYANG Ruican;WANG Weijun;YUAN Chao(School of Resources,Environment and Safety Engineering,Hunan University of Science and Technology,Xiangtan 411201,China;Hunan Key Laboratory of Safe Mining Techniques of Coal Mines,Hunan University of Science and Technology,Xiangtan 411201,China)

机构地区：[1]湖南科技大学资源环境与安全工程学院,湖南湘潭411201 [2]湖南科技大学煤矿安全开采技术湖南省重点实验室,湖南湘潭411201

出　　处：《矿业工程研究》2022年第2期1-8,共8页Mineral Engineering Research

摘　　要：采用理论与试验相结合的方法,提出了一个能够反映岩石蠕变全阶段过程的非线性弹黏塑性模型,建立了能够考虑孔隙水压的岩体蠕变本构方程,研究了孔隙水压对岩石蠕变的影响规律.研究表明:随着孔隙水压的增大,岩石出现加速蠕变的时间缩短,且加速蠕变阶段对应的加载应力减小;随着孔隙水压的增大,岩石加速蠕变过程曲线斜率增大,说明其蠕变加速度随着孔隙水压的增大而增大.结合三轴蠕变试验所得数据,利用MATLAB软件得到了孔隙水压作用下岩石加速蠕变的整个过程曲线,通过对比拟合曲线和试验曲线,验证了该模型的准确性.In this paper,a combination of theory and experiment is used to propose a nonlinear elasto-viscoplastic model that can reflect the full-stage process of rock creep,a constitutive equation for rock mass creep that can consider pore water pressure is established and the influence of pore water pressure over rock creep is studied.The research shows that,the time for accelerated creep of rock is shortened,and the loading stress corresponding to the accelerated creep stage decreases with the increase of pore water pressure;the slope of the accelerated creep curve of the rock increases,indicating that the creep acceleration increases with the increase of pore water pressure.Combining the data obtained from the triaxial creep experiment,MATLAB software is used to obtain the whole process curve of the accelerated creep of the rock under the action of pore water pressure,and the accuracy of the model is verified by comparing the fitted curve with the test curve.

关 键 词：孔隙水压 蠕变试验 本构方程 加速蠕变 非线性弹黏塑性模型 

分 类 号：TD315[矿业工程—矿井建设]