厚煤层整层开采关键层对垮落高度的影响分析.pdfVIP

学兔兔 第15卷第3期 (总第94期) 煤 矿 开 采 Vo1．15No．3(Series No．94) 2010年6月 Coal mining Technology June 2010 厚煤层整层开采关键层对垮落高度的影响分析 王志强 ，高全臣 ，赵景礼 ，何 涛 (1．中国矿业大学 (北京)力学与建筑学院，北京100083；2．中国矿业大学 (北京)资源与安全工程学院，北京100083) [摘 要] 对现有的上覆岩层垮落带高度判定公式进行理论分析，进行实验室相似模拟试验， 得出随着工作面的推进，关键层是否进入垮落带，取决于自身断裂的块度、厚度以及断裂长度三因 素。确定以关键层为研究对象，建立四边固支的弹性薄板力学模型，推导出其极限悬露断裂步距准 则，对其断裂后是否进入垮落带，给出判定准则，并结合工程背景计算实际关键层的断裂步距，与现 场观测数据值接近，认为计算比较客观。最终形成以关键层为主体的厚煤层整层开采上覆岩层垮落带 高度的确定方法。 [关键词] 整层开采；关键层；垮落带；断裂；弹性薄板 [中图分类号]TD327．2 [文献标识码]A [文章编号]1006—6225(2010)03-0007-03 Analysis of Influence of Key Strata on Caving Height in Single Full—seam Mining WANG Zhi—qiang ’ ，GAO Quan—chen ，ZHAO Jing—li ，HE Tao (1．Mechanical＆Architecture School，China University of Mining＆Technology(Beijing)，Beijing 100083，China； 2．Resources＆Safety School，China University of Mining＆Technology(Beijing)，Beijing 100083，China) Abstract：This paper researched caving zone height of overlying strata by theoretical analysis and analog simulation and obtained that with mining face advancing，whether the key strata reached caving zone was dependent on fracturing fragmentation，thickness and length．Key strata as research object，this paper set up a mechanical model of four—side clamped elastic thin slab to deduce its limit fracturing pace principle and judge whether it reach caving zone after fracturing．Based on an engineering case，actual fracturing pace was calculated which was close to observation value．Thus，a confirmation method for caving zone height of overlying strata controlled by key strata in full—seam mining formed． Key words：full·seam mining；key strata；caving zone；fracture；elastic thin slab 采场垮落带高度作为采场三带划分之一，对工 最低