煤矿胶结充填开采覆岩移动变形规律数值分析

摘要

In order to analyze the deformation and movement characteristics of overlying strata in cement backfilling mining face, we take the Xinyang Mine as the engineering background and applied FLAC3Dsoftware, to analyze the overlying strata stress and deformation of a small structure of coal wall-roof stratum-filling body in single-working face and a large structure of coal pillar-roof stratum-filling body in the cross-working faces under different filling rates. The results show that:in the single-working face, the pressurized area appears in front of the working face and the decompression area appears on the filling side; with the increase of filling rate, the deformation of the overlying strata decreases, and abutment pressure of the filling body and coal mass in front of the working face becomes smaller. In the area of cross-working faces, continuous bending subsidence occurred in the main roof along the dip, no break, and the maximum subsidence occurred at the midpoint of each working face. With the increase of filling rate, the maximum settlement of the main roof decreases obviously.%为分析煤矿胶结充填开采上覆岩层移动变形规律,以新阳矿十采区为工程背景,应用FLAC3D数值软件进行了模拟研究,分析了在不同充填率条件下,在一个回采空间内形成的"煤壁-顶板-充填体"的小结构和多个平行工作面形成的"煤柱-顶板岩层-充填体"的大结构上覆岩层的受力和变形情况.研究结果表明:在单工作面区域内,工作面前方出现增压区,在充填体侧出现减压区,随着充填率的增加,覆岩的移动变形量减小,充填体和工作面前方煤体的支承压力变小;在多个平行工作面区域内,基本顶在煤层倾斜方向上发生了连续弯曲下沉,基本顶的最大下沉量发生在各工作面中点位置;基本顶最大下沉量随充填率的增加而明显减小.