玉华煤矿综采工作面面间煤柱合理尺寸研究

合理尺寸的煤柱既可以保证巷道的稳定性,也可以提高煤炭的回收率.本文以铜川玉华煤矿为背景,通过应力动态监测、理论推导与工程验证相结合的方法确定区段煤柱合理留设宽度.通过对2410工作面进行应力监测,发现相较于采空区侧煤柱,实体煤的承载能力较高,应力增量较大,在采动影响下应力峰值向深部转移时间晚.为进一步确定煤柱具体留设宽...

Study on the Reasonable Size of Coal Column in Surface of Fully Mechanized Mining in Yuhua Coal Mine

A reasonable size coal pillar can not only ensure the stability of the roadway, but also increase the recovery rate of coal. Taking Tongchuan Yuhua Coal Mine as the background, the reasonable leaving width of the section coal pillars is determined by the method of combining stress dynamic monitoring, theoretical derivation and engineering verification. Stress monitoring on the 2410 working face found that compared with the coal pillars on the side of the goaf, solid coal has a higher bearing capacity and a larger stress increase. Under the influence of mining, the peak stress transfer time to the deep part is later. In order to further determine the specific width of the coal pillars, considering the arching effect of coal and rock mass collapse after mining at the working face, a force-transmitting arch model of the overlying rock mass transferring load to the coal pillars is established, and the distribution law of the supporting pressure of the coal pillars is studied. After clarifying the load transfer mechanism and the force of the coal pillar, combining the limit equilibrium theory and the rigid plastic theory, the reasonable leaving width of the coal pillar between the fully mechanized mining face and the reinforcement range of the coal bank are obtained. According to the research results, the engineering verification is carried out, and the observation results of the roadway surface displacement show that the designed coal pillar size is reasonable and reliable. The research results have reference significance for the determination of the section coal pillar width under similar mining conditions.