地应力分布对动力灾害的影响规律分析

为研究地应力分布特征对煤与瓦斯突出的影响规律，采用理论分析和现场实例验证相结合的方法，即通过数值模拟方法分析原岩应力的分布对采动应力场、煤岩体的物理力学性质等要素的影响，探究应力方向对采面回采突出危险性影响规律，并结合桑树坪煤矿南一采区实测数据加以验证。研究结果表明，当最大应力方向垂直于巷道掘进或采面回采方向时，工作面前方应力集中现象更明显、卸压破坏区范围更大、煤体孔隙率更低，工作面发生突出危险率也更强。并结合桑树坪煤矿南一采区煤与瓦斯突出现象与地应力实测数据，验证了当最大主应力方向垂直于推进方向时突出危险性更大。

Analysis of Influence Law of Ground Stress Distribution Law on Prominence

Abstract: In order to study the influence law of ground stress distribution characteristics on coal and gas protrusion, the method of combining theoretical analysis and field example verification is adopted. That is, through the numerical simulation method, we analyze the influence of the distribution of raw rock stress on the elements of mining stress field and physical and mechanical properties of coal and rock body, and explore the law of influence of stress direction on the protrusion risk of mining surface retraction. The research results show that when the maximum stress direction is perpendicular to the direction of roadway digging or surface recovery, the stress concentration phenomenon is more obvious in front of the working face, the larger the scope of the unloading damage zone, the lower the porosity of the coal body, and the stronger the risk of protrusion at the working face. And combined with the coal and gas protrusion phenomenon in the south one mining area of mulberry pine coal mine and the actual measured data of ground stress, it verifies the phenomenon that the protrusion risk is greater when the maximum main stress direction is perpendicular to the direction of advancement.