覆岩采动裂隙带动态演化模型的实验分析  

Experimental Analysis of Dynamic Evolution Model of Mining-Induced Fissure Zone in Overlying Strata

作　　者：林海飞[1] 李树刚[1] 成连华[1] 王红胜[1] 

机构地区：[1]西安科技大学能源学院,陕西西安710054

出　　处：《采矿与安全工程学报》2011年第2期298-303,共6页Journal of Mining & Safety Engineering

基　　金：国家自然科学基金项目(50874089);高等学校博士学科点专项科研基金项目(20096121110002);陕西省教育厅科研计划项目(2010JK681)

摘　　要：为研究采动覆岩裂隙演化规律及其形态,基于采动裂隙"O"形圈理论,结合物理相似材料模拟实验,提出了"采动裂隙圆角矩形梯台带"工程简化模型,分析了动态演化过程.得到采动裂隙带的演化高度、沿走向与倾向的带宽距及断裂角等参数,即切眼侧带宽大约1倍初次来压步距,工作面侧带宽在2～3倍周期来压步距间变化,进风巷、回风巷附近带宽约0.7～0.8倍初次来压步距,内外梯台面的高度受制于关键层层位及所形成砌体梁结构的变形、破断和失稳形态.分析了煤层采高、覆岩岩性、煤层倾角及工作面几何参数等采动裂隙带形态的主要影响因素.通过现场验证,表明依据裂隙带演化模型可确定瓦斯抽采巷(或钻孔)的位置,抽出高含量卸压瓦斯.In order to study the evolution law and distribution features of mining-induced fissure in overlying strata,based on the O-shaped circle law,the engineering simplified model of mining-induced fissure round-rectangle trapezoidal zone is put forward,and the dynamic evolution process is analyzed with the model experiment.The evolution height,strike zone width,dipping zone width,and break angle are obtained.The result shows that 1） the zone width of starting cut is about the first weighting step,2） the zone width of face is changing between 2～3 times of period weighting step,3） the zone width near intake entry and return entry is about 0.7～0.8 times of the first weighting step,and 4） the height of trapezoidal surface is basically subject to the location of the key strata,deformation,and breaking and instability form of the voussoir beams structure.The main influencing factors of mining-induced fissure zone pattern,such as mining height,lithology of overlying strata,dipping angle of coal seam,and geometric parameters of face are analyzed,indicating that the ultimate position of methane drainage boreholes or roadways can be determined and the high relieved methane can be degassed.

关 键 词：采动裂隙 圆角矩形梯台带 模型参数 影响因素 

分 类 号：TD713[矿业工程—矿井通风与安全]