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为研究大同矿区综放开采的覆岩运动特征,以同忻矿8105工作面为研究对象,运用关键层理论确定了同忻矿8105工作面关键层分布,采用理论分析、相似材料模拟方法对压力拱的演化规律进行了研究,并结合现场监测数据对研究结果进行了验证。结果表明,在同忻矿双系煤层开采条件下,关键层破断影响着压力拱的发展高度,沿工作面推进方向,压力拱的失稳步距为283~330 m。拱脚位置在工作面前方40~55 m,压力拱承载着大部分的覆岩载荷,一旦发生失稳破坏,会造成石炭系岩层与侏罗系采空区连通,引起工作面强矿压显现。
In order to study the characteristics of overlying strata movement in fully mechanized caving mining in Datong Mine, 8105 working face of Tongxin Mine was selected as the research object. Based on the key layer theory, the key layer distribution of 8105 working face of Tongxin Mine was determined. Theoretical analysis and similar material simulation The evolution of the arch was studied, and the results were verified by field monitoring data. The results show that under the conditions of double coal seam mining in Tongxin Mine, the key layer rupture affects the development height of the pressure arch and the unsteady step of the pressure arch is 283 ~ 330 m along the working face. Arch foot position in the face 40 ~ 55 m, the pressure arch carrying most of the overburden load, in the event of instability, will cause the Carboniferous strata and Jurassic gobo connectivity, causing the face of strong mineral pressure appears .