多年冻土层下煤层开采覆岩破断规律研究  

Research on Overburden Breaking Law of Coal Mining under Permafrost

作　　者：索永录[1,2] 白愿 SUO Yonglu;BAI Yuan(College of Energy Science and Engineering,Xi'an University of Science and Technology,Xi'an 710054,China;Key Laboratory of Western Mine Exploration and Hazard Prevention,Ministry of Education,Xi'an 710054,China)

机构地区：[1]西安科技大学能源学院,西安710054 [2]教育部西部矿井开采及灾害防治重点实验室,西安710054

出　　处：《煤炭技术》2022年第3期5-9,共5页Coal Technology

摘　　要：以青海木里煤田江仓四矿为研究背景,通过实验室试验得到了矿区冻土的抗压强度、抗拉强度及弹性模量随温度的变化关系式;通过理论分析,以"薄板"理论为基础建立了长壁采场顶板"板盖"结构力学模型,推导并计算得出江仓四矿首采区上覆多年冻土层初次、周期性破断步距表达式及数值,应用FLAC^(3D)数值模拟方法对首采工作面开采过程进行模拟。结果显示:冻土层受采动影响大,温度对冻土位移影响明显,冻土层两侧发生明显塑性破坏,冻土层地表最大下沉量约2.0 m。Based on the research background of Jiangcang No.4 mine in Muli coalfield,Qinghai province,the relationship between the compressive strength,tensile strength and elastic modulus of frozen soil and temperature is obtained through laboratory tests;through theoretical analysis and based on the"thin plate"theory,the structural mechanical model of"plate cover"of longwall stope roof is established,and the expressions of the first and periodic breaking step distance of permafrost overlying the first mining area in Jiangcang No.4 mine are derived;FLAC^(3D) numerical simulation method is used to simulate the mining process of the first working face.The results show that the permafrost is greatly affected by mining,the temperature has a significant impact on the displacement of permafrost,the plastic damage occurs on both sides of the permafrost,and the maximum surface subsidence of permafrost is about 2.0 meters.

关 键 词：多年冻土层 温度 破断步距 “板盖”理论 

分 类 号：TD823[矿业工程—煤矿开采]