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岩体内随机分布结构面对软岩流变的影响主要表现为尺寸效应.通过对四种不同尺寸砂质页岩试件的分级增量循环加、卸载单轴压缩蠕变实验,揭示了该类软岩的流变可以用萨乌斯托维奇模型来描述,模型的三个本构参数EH(线弹性参数)、EK(黏弹性参数)和ηK(黏性系数)值随软岩试件尺寸增大而不断减小并最终趋于一定值,这一规律可用具有极值条件的非线性回归方程来表达.由此获得了求解结构面随机分布条件下工程岩体连续微元尺寸的外推方法,利用该法可通过对室内不同尺寸岩石试件的流变力学实验确定在连续性概化范围内工程岩体的流变模型及其力学参数值.
The effect of random distribution structure in soft rock on the rheology of soft rock mainly shows the size effect.Based on the incremental incremental unloading and unloading creep tests of four different sizes of sandy shale samples, The rheology of soft-like rocks can be described by the Savustovich model. The three constitutive parameters EH (linear elastic parameters), EK (viscoelastic parameters) and ηK (viscous coefficient) Which can be expressed by the nonlinear regression equation with the extreme conditions.According to this, the continuous micro-size of the rock mass under the condition of random distribution of the structural plane is obtained The method of extrapolation can be used to determine the rheological model and mechanical parameters of engineering rock mass in the range of continuity through the rheological mechanics experiments on rock specimens of different sizes indoors.