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利用三轴渗流测试系统,模拟不同厚度的顶板、煤层和底板条件,进行了不同岩煤高度比条件下煤岩组合试件的力学特性与渗流规律的试验研究。结果表明:对于不同岩煤高度比的煤岩组合试件,失稳破坏的峰值强度存在差异,且峰值强度随岩煤高度比的增加呈增大趋势;组合煤岩体的失稳破坏呈现宏观剪切破裂面,且破裂面贯穿顶、底部岩石;组合煤岩体的渗透率随轴向应变的升高呈现先减小到最小值后迅速增加的“V”型变化趋势;且随着岩煤高度比的增加,渗透率曲线反弹点对应的轴向应变呈增大趋势。
Three-axis seepage test system is used to simulate roof, coal seam and floor conditions with different thicknesses. Experimental study on mechanical properties and seepage of coal-rock composite specimens under different rock coal height ratios is carried out. The results show that there is a difference in the peak strength of failure of coal and rock samples with different coal rock heights, and the peak strength increases with the increase of rock coal height ratio. The failure of the composite coal and rock mass shows macroscopic Shear fracture surface, and the fracture surface penetrates the top and bottom rocks. The permeability of the composite coal and rock mass shows a trend of “V” that increases rapidly with the increase of axial strain and then increases rapidly with the increase of With the increase of rock coal height ratio, the axial strain corresponding to the rebound point of permeability curve shows an increasing trend.