软岩厚煤层开采覆岩破坏规律三维数值模拟分析  

Three-dimensional numerical simulationin of damage of overlying strata in mining of thick coal seam

作　　者：赵德深[1] 徐孟林[1] 

机构地区：[1]大连大学辽宁省复杂结构体系灾害预测与防治重点实验室,辽宁大连116622

出　　处：《广西大学学报（自然科学版）》2013年第1期235-239,共5页Journal of Guangxi University（Natural Science Edition）

基　　金：国家自然科学基金资助项目(51274051)

摘　　要：鉴于导水裂隙带高度经验公式在软岩厚煤层中的不合理性及其应用的局限性,以铁煤集团大平煤矿S2S9工作面综采开采工程为原型,采用有限元软件进行三维数值模拟,揭示大型水体下三软煤层采用放顶煤开采条件下的覆岩破坏规律,确定导水裂隙带的高度,并利用理论分析对其结果进行验证。结果表明:剪切应力值达到最大并超过了岩体的最大剪切强度时,导水裂隙带高度达到最大;导水裂隙带高度形态为梯形,切眼边可能导水裂隙带的发育高度比推进边的大;计算结果与理论分析结果相近。该研究可为实现大平煤矿库下安全高效开采奠定基础,同时也为其他地区软弱覆岩厚煤层综放开采技术研究起到一定借鉴作用。In view of the irrationality and the limitation of the empirical formula on the height of wa- ter flowing fractured zone of soft rock and thick coal seam, taking the comprehensive exploitation project of S2S9 working face in Daping Coal mine as a prototype, 3-D numerical simulation with the finite element method was used to reveal the damage of overlying strata in mining roof-coal in Three Soft coal seam under water. Thus it determines the height of the water flowing fractured zone and tests the simulation results by comparing them with the theoretical analysis results. The results show that when shear stress reaches the maximum value and exceeded the maximum shear strength of rock mass, the height of water flowing fractured zone reaches the maximum ; and when the shape of water flowing fractured zone is trapezoid, the height of water flowing fractured zone of the cut edges is lar- ger than that of the advancing edge. These results are consistent with the theoretical analysis. The research provides some guarantee for safe and high efficient exploitation in the Daping Coal Mine, and can serve as a reference to the mining technology in soft rock of extra-thick seams.

关 键 词：经验公式 三维数值模拟 覆岩破坏 导水裂缝带 

分 类 号：TD325[矿业工程—矿井建设]