大倾角软煤综放工作面倾斜方向顶煤区划破坏特征  

Regional fracture of top-coal along the inclined direction of fully-mechanized caving face in soft steep dipping seam

作　　者：伍永平[1] 郎丁[1] 解盘石[1] 王红伟[1] WU Yongping;LANG Ding;XIE Panshi;WANG Hongwei(School of Energy Engineering, Key Laboratory of Western Mine Exploitation and Hazard Prevention, Ministry of Education, Xi＇an University of Science and Technology, Xi＇an, Shaanxi 710054, China)

机构地区：[1]西安科技大学能源学院,教育部重点实验室西部矿井开采及灾害防治,陕西西安710054

出　　处：《采矿与安全工程学报》2018年第3期553-560,共8页Journal of Mining & Safety Engineering

基　　金：国家自然科学基金项目(51634007,51074120)

摘　　要：基于理论分析、数值模拟计算与物理相似材料模拟实验方法揭示了沿工作面倾斜方向不同外部载荷作用下顶煤的损伤劣化机理与程度。结果表明:采场非对称分布的支承压力对顶煤的"预破碎"具有区划作用,但影响程度有限。顶煤最终的破碎程度主要受其上覆岩层"施载源"的组构与运动模式影响,倾斜方向该"施载源"的形成层位自下而上逐渐向高位跃迁,且在采空区非均匀充填作用影响下倾斜方向不同区域"施载源"内部破断顶板的"运动空间"存在显著差异,最终导致顶煤沿倾斜方向的破碎程度呈"上部最大,中部次之,下部最小"的区划特征。生产现场支架稳定性沿倾斜方向的分布进一步验证了顶煤的区划破坏特征。Theoretical analyses, numerical simulations and physical material simulation studies have been used to reveal the fracture mechanism and fracture degree of the top-coal affected by different external loadings along the inclined direction. Results show that the pre-breaking top-coal affected by asymmetrical abutment pressure presents regional characteristics, but it is limited. The final fractures of top-coal are mainly effected by the form and movements of overburden ＂loading source＂ and the form location of ＂loading source＂ transports to the higher stratum from bottom to top along the inclined direction. The moving space of the fractured roof inside the ＂loading source＂ along the inclined are different and finally causes the regional fracture characteristics presenting ＂highest in the higher area, less in middle area and lowest in bottom area＂. The regional fractures of top coal have been further verified by the characteristics of support stability along the inclined in practices.

关 键 词：煤体损伤 采动应力场 岩体结构变异 围岩控制 

分 类 号：TD322[矿业工程—矿井建设]