陕南泥岩三轴压缩蠕变试验及其数值模拟研究

摘要

在对泥岩进行室内三轴流变压缩蠕变试验的基础上,确定了泥岩Burgers流变模型本构方程中的各参数数值,描述了陕南勉宁地区泥岩的流变特征.结果表明:随着荷载的增加,泥岩出现明显的三个阶段的蠕变曲线,试块的总体蠕变量较大.利用FLAC3D软件对三轴压缩蠕变试验(围压1MPa)进行了模拟计算,确定泥岩计算机模拟时的流变计算参数.在此基础上,分别对泥岩不同围压和不同试件形态状态下的三轴压缩蠕变试验进行了数值模拟计算,结果表明:圆柱体试件的应变量数值整体小于立方体试验试件的应变量数值.%Based on the indoor triaxial compression creep test of the mud rock in southern Shaanxi, the parameter values of Burgers model about the mud rock are determined, and the rheology characteristics of the mud rock are described.The results showed obvious three stages of the creep curves of the mud rock with the increase of load, and the total creeping values of the sample is quite large.The simulation about the triaxial compression test under the confining pressure of 1 MPa is numerated by the FLAC3D software, and the rheology parameters of the simulated numeration about the mud are confirmed.On this basis, the triaxial compression creep test under the different shapes and confining pressures of the test models are simulated respectively.The results showed that the strain values of cylindersample are smaller than that of cube sample totally.As a result, the definite reference for the more study on the rheology characteristics of the mud rock in southern Shaanxi is provided.