急斜特厚煤层水平分段综放开采覆层类椭球体结构分析

采矿与安全工程学报 ›› 2014, Vol. 31 ›› Issue (5): 716-720.

急斜特厚煤层水平分段综放开采覆层类椭球体结构分析

西安科技大学能源学院，教育部西部矿井开采及灾害防治重点实验室，陕西西安 710054

出版日期:2014-09-15 发布日期:2014-10-08
作者简介:来兴平(1971—)，男，宁夏回族自治区平罗县人，博士(后)，教授，博导，从事岩石力学和煤岩动力灾害防治基础方面的研究。 E-mail：lxptest@yahoo.com.cn Tel：13186187301
基金资助:
国家自然科学基金重点项目(U13612030)；陕西省重点科技创新团队计划项目(2013KCT-16)；陕西省自然科学基金重点项目(2011JZ010)

Overlying strata ellipsoid-style structure of horizontal section top-coal caving in steeply inclined and extra thick coal seam

Online:2014-09-15 Published:2014-10-08

摘要/Abstract

摘要： 急斜特厚煤层水平分段综放(Horizontal Section Top-coal Caving，HSTCC)工作面覆层结构稳定性预测对安全开采至关重要。以乌鲁木齐矿区急斜特厚煤层安全开采为目标，采用理论分析、数值计算和现场探测等综合方法，揭示了HSTCC条件下覆层类椭球体结构形成过程与局部化动态演化规律。研究表明：急斜特厚煤层水平分段综放开采工作面覆层垂向变形演化非对称趋势显著，顶煤与上覆残留煤矸复合形成非对称“拱结构”并演化为典型倾斜椭球体结构；拱角与拱顶煤岩滑落失稳，造成工作面局部压力畸变并诱发动力学灾害。这对急斜特厚煤层覆层结构和高度留设设计和灾害防治具有指导作用。

关键词: 急斜特厚煤层, 覆层, 煤岩动态演化, 类椭球体结构, 失稳致灾

Abstract: It is crucial to predict the structure stability of overlying strata in steeply inclined and extra thick coal seams applying horizontal section top-coal caving (HSTCC) method. In this paper, aimed at safe miming in steeply inclined and extra thick coal seams of Urumqi mine region, the formative process and dynamical evolutionary regularity of ellipsoid-style structure of overlying strata in HSTCC condition were studied by using theoretical analysis, numerical computation and field monitoring. The results show that the non-symmetrical trend of vertical deformation is remarkable at HSTCC working face of steeply inclined and extra thick coal seam. Meanwhile, the non-symmetrical arch can be formed due to the composition of top-coal and residual overlying gangue. Sequentially the unique and steep ellipsoid-style structure will be formed dramatically. Finally, the coal-rock mass in the arch angle and apex is slided, and causes the distortion of local rock pressure, even induces dynamic hazards around working face. The results can provide guidance for the design of strata structure and height, and the prevention of dynamic hazard in steeply inclined and extra thick coal seams.

Key words: steeply inclined and extra thick coal seams, overlying strata, dynamical evolution of coal-rock, ellipsoid-style structure, instability and inducing hazard

来兴平, 孙欢, 单鹏飞, 邱华富. 急斜特厚煤层水平分段综放开采覆层类椭球体结构分析[J]. 采矿与安全工程学报, 2014, 31(5): 716-720.

LAI Xingping, SUN Huan, SHAN Pengfei, QIU Huafu. Overlying strata ellipsoid-style structure of horizontal section top-coal caving in steeply inclined and extra thick coal seam[J]. Journal of Mining & Safety Engineering, 2014, 31(5): 716-720.