基于尺度效应的含瓦斯煤体力学性质研究

Research on mechanical properties of gas-bearing coal body based on scale effect

对含瓦斯煤体在尺度效应影响下的力学性质进行研究,通过RFPA 2D软件数值模拟定宽和定高2种情况下的煤样强度演化特征,对含瓦斯煤样进行了力学性质实验,并将模拟结果与力学性质实验数据进行了对比分析。研究结果表明,含瓦斯煤体抗压强度随着煤样高径比的增加而明显减小,相同尺寸下,含瓦斯煤样的强度随着瓦斯压力的增加而减小。研究可为煤矿瓦斯灾害防治措施的制定提供依据。

This paper studied the mechanical properties of gas-containing coal under the influence of the scale effect,and used RFPA 2D software to numerically simulate the strength evolution characteristics of coal samples under two conditions of fixed width and fixed height,and conducted mechanical properties of gas-containing coal samples.Experiment and compare the simulation results with the experimental data of mechanical properties.The research results showed that the compressive strength of gas-containing coals decreases with the increase of the coal sample′s height-to-diameter ratio.Under the same size,the strength of gas-containing coal samples decreased with the increase of gas pressure.Research could provided a basis for the formulation of coal mine gas disaster prevention measures.