新疆巨厚煤层开采覆岩结构演变特征研究
首发时间:2017-12-29
摘要:(1)基于新疆典型巨厚煤层赋存条件,采用物理模拟、数值计算等方法,系统研究了巨厚煤层多分层开采重复扰动条件下岩层的二次破断特征、顶板及覆岩结构的演变过程,明确了覆岩由梁式结构向拱式结构的演化机理,揭示了支架需控围岩的变化特征及巨厚煤层开采"支架-围岩"关系特点。研究结果表明:开采前期顶板结构以砌体梁为主,顶板结构稳定受开采参数及覆岩赋存特征的影响,支架载荷主要以基本顶回转下沉、顶煤和直接顶重量为主;重复开采后期(四次采动后),受开采扰动和岩层运动等影响,顶板岩层发生二次破断,顶板结构由梁式结构逐渐向拱式结构转变,并随开采空间和扰动次数的增大,拱式结构向上发展,支架载荷主要为挤压拱内松散岩体的重量。随着新疆巨厚煤层大规模开采的进行,论文研究成果可为该区顶板稳定性控制提供借鉴。
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Study on evolution characteristics of overlying strata structure for extremly-thick coal seam mining in Xinjiang
Abstract:According to the typical extra-thick coal seam occurrence conditions in Xinjiang, the overlying strata re-fractured and the structure evolution process were studied systematically under multiple disturbance of extra-thick coal seam slicing by physical and numerical simulations. The influence factor of the overlying strata beam structure was cleared. The change characteristics and the effect mechanism of strata controlled by support was revealed, and the support and surrounding rock relatStudy on evolution characteristics of overlying strata structure for extremly-thick coal seam mining in Xinjiangionship was analyzed. The results indicated that roof structure was mainly voussoir beam in the early mining stage which stability affected the overlying strata occurrence conditions and mining parameters. The support load was mainly the load of main roof rotary sinking, top coal and immediate roof. As a result of mining disturbance and strata movement, the overlying strata re-fractured in the later mining stage. The roof structure has been changed from beam to arch gradually and grow upwards with the increase of repeated mining times. The support load was mainly the gravity load of the friable rock mass within extrusion arch. The research results could provide theoretic references for roof control in Xinjiang.
Keywords: Extremly-thick coal seam Repeated mining Overlying strata structure Support and surrounding rock relationship
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