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岩石压力拱对采空区围岩稳定具有重要维护作用。本文基于采场围岩应力函数讨论了压力拱的影响因素,进而借助数值模拟软件,定性分析了煤矿采空区空间几何特征变化对压力拱的影响程度。得到如下主要结论:当采空区埋深达到能形成完整的压力拱后,再增加埋深不会改变压力拱的空间形态,但压力拱承载能力提高;采空区宽度增加对压力拱的影响最大,尤其是覆岩内的拱体内边界将远离采空区;采空区长度增加对覆岩内工作面走向的压力拱拱体影响较大,对其他方向拱体的影响甚微。
Rock pressure arch has an important role in maintaining the stability of surrounding rock in goaf. In this paper, the influence factors of pressure arch are discussed based on the stress function of the surrounding rock of stope, and then the numerical simulation software is used to qualitatively analyze the influence degree of the spatial geometric variation on the pressure arch in the coalmine goaf. The main conclusions are as follows: When the depth of mined-out area can form a complete pressure arch, then increasing the depth will not change the spatial configuration of the pressure arch, but the carrying capacity of the pressure arch will increase; the influence of the width of the goaf on the pressure arch The maximum, especially the inner boundary of the arch in the overburden, will be far away from the goaf; the increase of the length of the goaf has a great influence on the arch of pressure in the overburden, but has little effect on the arch in other directions.