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膏体充填料到达采场初始温度不同是矿山存在的普遍现象,不同初始温度条件下膏体力学特性及应力-应变关系直接影响到矿山采充周期及相邻采场开采时贫化指标.通过对初始温度为2、20、35和50℃的硬化膏体进行单轴抗压强度试验,获得不同初始温度下充填体应力-应变演化曲线.根据理论推导和试验结果,建立了不同初始温度下膏体损伤本构模型,通过本构模型参数回归,提出膏体温度-时间耦合损伤本构模型.最后,采用Comsol数值模拟软件,将温度-时间耦合损伤本构模型嵌入solid mechanics模块,对单轴抗压试验进行数值模拟,模拟应力-应变曲线与试验结果较为吻合,验证了所提出本构模型的可靠性.
The initial temperature of the paste filling material reaching the stope is a common phenomenon existing in the mine. The mechanical properties and stress-strain relationship of the paste under different initial temperature conditions have a direct impact on the mining cycle and the depletion index of the adjacent stope mining. The uniaxial compressive strength tests of the hardened paste with initial temperature of 2, 20, 35 and 50 ℃ were carried out to obtain the stress-strain evolution curves of the filler at different initial temperatures.According to the theoretical derivation and experimental results, The constitutive model of the plaster is damaged, and the temperature-time coupling damage constitutive model of the plaster is proposed through the parameter regression of the constitutive model.Finally, using Comsol numerical simulation software, the temperature-time coupling damage constitutive model is embedded in the solid mechanics module, Axis compression test is carried out. The simulated stress-strain curve is in good agreement with the experimental results, which verifies the reliability of the proposed constitutive model.