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针对围岩体应力-应变的变化规律,利用改进的非线性Burgers模型建立本构关系,描述围岩岩体内应力-应变-时间的关系。采用安徽理工大学液压加载试验系统,对采自潘北煤矿石灰岩岩样进行单轴分级加载试验,获得试验数据,根据试验数据对建立的蠕变本构方程进行参数反演,将得到的方程拟合曲线与试验拟合曲线进行比较。
According to the variation of stress and strain of surrounding rock mass, the constitutive relation was established by the improved nonlinear Burgers model, and the stress-strain-time relationship in the surrounding rock mass was described. Using hydraulic loading test system of Anhui University of Science and Technology, the limestone samples taken from Panbei Coal Mine were subjected to uniaxial grading and loading tests, and the experimental data were obtained. Based on the experimental data, the constitutive equations of the creep were established. The obtained equations The combined curve is compared with the experimental fitted curve.