基于当层法的煤矿斜井围岩压力拱分析

Analysis of Pressure Arch of Surround Rock in Inclined Shaft Based on Equivalent Layered Method

为研究不同倾角下煤矿斜井开挖时围岩压力拱的变化和优化巷道支护设计,以东胜煤田塔拉壕煤矿为依托,基于Покровский当层法理论,通过定义2种应力路径,对比分析了复合地层条件下,分别在6°、12°、18°倾角下直墙拱形和圆形断面硐周围岩压力拱内外边界及拱体厚度变化情况。结果表明:对于直墙拱形和圆形断面,随着倾角增大,硐室上方和两侧压力拱内边界距硐周距离不变,外边界距离增大,围岩承载能力增强;在3种倾角下圆形断面应力拱边界较直墙拱形距硐周距离均较小,但主应力峰值较大,也说明了在斜井中圆形断面压力拱作用效果弱于直墙拱形。

In order to study the change of surrounding rock pressure arch and the design of optimal roadway support for excavation of inclined shaft under different inclinations, on the basis of Talahao Coal Mine of Dongsheng Coalfield and the Покровский layer method theory, by defining two kinds of stress paths, the internal and external boundary and arch thickness of the surrounding rock pressure arch around the straight wall arch and the circular section hole under the conditions of 6 °, 12° and 18 ° are compared and analyzed respectively. The results show that in the straight wall arch and circular cross section conditions, with the increase of the inclination angle, the distance between the upper part of the cavern and the boundary between the two sides of the pressure arch is constant and the distance of the outer boundary increases, the wall rock bearing capacity is also increased; under the three kinds of inclinations, the inner and outer boundary of the stress section of the circular section is smaller than that of the straight wall, but the main stress peak is large, which also shows that the effect of the circular arch in the inclined shaft is weaker than that of the straight wall arch shape.