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采用FLAC~(3D)对复合煤岩模型的单轴压缩破裂进行数值模拟及试验,研究复合煤岩受载破裂应力与应变关系变化规律。针对煤样厚度、复合煤岩组合比、煤层参数、顶底板岩性等参数,对复合煤岩模型进行加载仿真研究,仿真及试验结果表明:单一煤样模型随着高度的减小,应力应变曲线整体阶段存在尺寸效应;改变煤岩组合比例时,其抗压强度基本不变,随煤样比例增大,复合煤岩的整体弹性模量减小,整体刚度减小;单一改变复合煤岩的煤样参数时,随煤样弹性模量增大,复合煤岩的弹性模量越强,应力应变曲线峰值点越高,对应应变越小;单一改变顶底板岩性,对复合煤岩模型的应力应变曲线影响不大。试验结果和仿真结果变化趋势一致,表明所建模型具有一定正确性和适用性。
The uniaxial compression failure of the composite coal and rock model was simulated and tested by FLAC 3D, and the relationship between the stress and strain of the composite rock under load was studied. According to the thickness of coal sample, composite coal-rock composition ratio, coal seam parameter, roof and floor lithology and other parameters, the simulation study on the loading behavior of the composite coal and rock model is carried out. The simulation and experimental results show that with the reduction of height, The compressive strength of the composite rock is basically the same when the ratio of coal and rock is changed. With the increase of the proportion of coal, the overall elastic modulus of the composite rock decreases and the overall stiffness decreases. , The higher the elastic modulus of composite coal and rock, the higher the peak value of stress-strain curve is, the smaller the corresponding strain is. With a single change of top and bottom lithology, The stress-strain curve has little effect. The results of the experiment and the simulation results show the same trend, which shows that the model has some correctness and applicability.