俯伪斜采煤法基本顶破断的力学分析  

Mechanical analysis of main roof breakage with dip oblique coal mining method

作　　者：施峰[1,2] 王宏图[1,2] 范晓刚[3] 袁志刚[1,2] 胡国忠[1] 

机构地区：[1]重庆大学煤矿灾害动力学与控制国家重点实验室,重庆400030 [2]重庆大学复杂煤气层瓦斯抽采国家地方联合工程实验室,重庆400030 [3]中国煤炭科工集团有限公司重庆研究院,重庆400037

出　　处：《煤炭学报》2013年第6期1001-1005,共5页Journal of China Coal Society

基　　金：重庆市科委自然科学基金计划资助项目(cstc2012jjB00005);国家自然科学基金资助项目(51104155);重庆市国土局资助项目(2009-01)

摘　　要：为弄清俯伪斜采煤法基本顶破断的具体情况,以某俯伪斜采煤法的悬露基本顶为研究对象,应用弹性薄板理论,建立了俯伪斜基本顶的力学模型,分析并得到了充填体对基本顶的支撑载荷函数,运用李滋法和挠度的叠加原理,推导出基于采空区充填的俯伪斜基本顶挠曲函数,并对基本顶的破断过程进行了分析。研究结果表明:由于冒落矸石在采空区的不完全充填,导致俯伪斜基本顶的挠度沿倾向不对称,最大挠度为60.9 cm,位于倾斜中上部;基本顶沿倾斜方向由上向下分段破断,并且形成相对稳定的铰接结构,分段岩块沿走向破断距也有差别,倾斜中上部破断距小于下部。理论计算分析的结果与现场的矿压监测情况基本一致。In order to understand the mechanism of main roof breakage with dip oblique coal mining method, this study investigated the breakage of mine main roof, established a mechanical model and obtained a support load function once the main roof was caved based on the elastic thin plate theory. Using the Rayleigh-Ritz method and the deflection su- perposition principle, a main top deflection function was derived and a basic roof breaking process was analyzed based on the caving process in a mined-out area with the dip oblique coal mining method. The results show that the asymme- try of the main roof deflection occurs because of the incomplete caving of falling gangues in vacant place with the dip oblique coal mining method. The maximum deflection is 60.9 cm, located in the upper part of caving roof. The main roof breaks into various sections from upper to lower section, and forms a relatively stable hinged structure. The dis- tances of break between sections are also different, the breakage distance in upper part is less than that in lower part. Also ,the theoretical calculation results are consistency with the site mine pressure monitoring.

关 键 词：俯伪斜采煤法 基本顶 挠度 破断 

分 类 号：TD823.21[矿业工程—煤矿开采]