急倾斜厚煤层放顶煤开采“半圆拱”结构分析  

Analysis on the Semi-circular Arch Structure of Top Coal Caving in Steep-inclined Thick Coal Seam

作　　者：郭鹏飞[1,2] 张晓虎[1] 金珠鹏[3] 孙广义[3] GUO Pengfei ZHANG Xiaohu JIN Zhupeng SUN Guangyi(State Key Laboratory for Geomechanies and Deep Underground Engineering, China University of Mining ＆ Tech- nology, Beijing 100083, China School of Mechanics and Civil Engineering, China University of Mining and Technology, Beijing 100083, China Heilongjiang University of Science and Technology, Harbin, Heilongjiang 150022, China)

机构地区：[1]中国矿业大学(北京)深部岩土力学与地下工程国家重点实验室,北京100083 [2]中国矿业大学(北京)力学与建筑学院,北京100083 [3]黑龙江科技大学,黑龙江哈尔滨150022

出　　处：《矿业研究与开发》2016年第11期6-11,共6页Mining Research and Development

基　　金：国家自然科学基金面上项目(51374214);国家自然科学基金青年科学基金项目(51404278)

摘　　要：通过现场观测、理论分析等方法,针对急倾斜中厚煤层工作面上覆岩层垮落规律及其对工作面支架的影响进行了研究,提出并建立了"半圆拱"结构的力学模型,依据砌体梁理论、岩石断裂理论等,对拱的受力、失稳类型及工作面矿山压力显现进行了详细分析,总结并分析了岩块滑移失稳和散体滑移失稳的两种力学机理,分析了"半圆拱"结构和垮落散体对工作面矿山压力显现的影响,验证了"半圆拱"结构力学演化模型和失稳力学模型的准确性,对急斜厚煤层安全高效开采具有重要的指导意义。Through the field observation, theoretical analysis and so on, the collapse rules of overlying strata in the work- ing face of steep-inclined and medium-thick coal seam were studied, as well as its influence on support. Then, the me- chanical model of semi-circular arch structure was proposed and established. The stress and the instability type of arch, as well as the obvious pressure in working face were analyzed in detail based on the voussoir beam theory and rock fracture theory. The mechanical mechanisms of rock block sliding and granular sliding were summarized and analyzed. The influ- ence of semi-circular arch＂ structure and falling rocks on the pressure behaviors in working face was analyzed. And the ac- curacies of mechanical evolution model and instability model were verified. The study had an important guiding signifi- cance for safe and efficient mining of steep-inclined thick coal seam.

关 键 词：急倾斜厚煤层 放项煤开采 水平分段 半圆拱 滑落失稳 

分 类 号：TD823.213[矿业工程—煤矿开采]