摘要
为了分析在冲沟坡体下浅埋煤层开采工作面矿压显现特征,基于冲沟发育的矿区浅埋煤层地质条件,以工作面背沟开采为主要方式,采用物理模拟和理论分析的方法,研究了浅埋煤层冲沟采动坡体活动特征。结果表明：冲沟坡体下开采时,基本顶初次破断具有不对称性;冲沟采动坡体被地表超前裂隙切割成多边块状,并在两侧坡体的夹挤摩擦作用下缓慢回转下沉;相同地质条件下,坡角越大,采动坡体对工作面矿压显现影响越大。同时,建立了在冲沟坡体下采场基本顶初次破断的力学模型,分析认为在冲沟发育浅埋煤层条件下,基本顶初次破断时开切眼侧与推进侧岩块长度比值为1~1.33。
In order to analyze the strata behavior features of the shallow depth thin seam mining,Based on the shallow depth seam geological conditions in the mining area developed by the gully,taking the mining in the coal mining face back side to the gully as the main mining method,the physical simulation and theoretical analysis method was applied to study the activity features of the shallow depth seam under the gully and mining-induced slope.The results showed that during the mining under the gully slope,the first breaking of the main roof would be asymmetry,the mining-induced slope of the gully would be cut into several blocks by the surface ground pilot cracks and would be slowly subsided in rotary under the pressing and friction functions of the two side slopes.Under the same geological conditions,when the slope angle was higher,the mining-induced slope would be highly affected to the strata behavior of the coal mining face.A mechanics model of the main roof first breaking in coal mining face under the gully slope was established.The analysis held that under the gully developed and shallow depth seam conditions,during the first breaking of the main roof,the length ratio of the rock blocks at the open-off cut side and the advanced side would be 1~1.33.
出处
《煤炭科学技术》
CAS
北大核心
2010年第6期18-22,共5页
Coal Science and Technology
基金
教育部新世纪优秀人才支持计划资助项目(NCET-05-0480)
中国矿业大学科技基金资助项目(2005B002)
中国矿业大学青年科研基金资助项目(2009A001)
关键词
浅埋煤层
沙土质冲沟
采动坡体
矿压特征
shallow depth seam
sand-soil gully
mining induced slope
pressure behavior features
