宽窄条带间隔部分充填的准静态开采实验研究  

Quasi-static Mining Experiment of Wide and Narrow Strip Interval Stowing

作　　者：赵云龙[1,2] 潘东江 王海琳[1] 于怀磊 来海斌 王敏[1] 

机构地区：[1]中国矿业大学孙越崎学院,江苏徐州221116 [2]煤炭资源与安全开采国家重点实验室,江苏徐州221116 [3]中国矿业大学矿业工程学院,江苏徐州221116

出　　处：《煤矿开采》2015年第6期10-14,30,共6页Coal Mining Technology

基　　金：国家重点基础研究发展规划(973计划)项目(2013CB227904);2013年国家级大学生创新训练项目(201310290068)

摘　　要：以某矿13煤及以上150m岩层作为研究对象,根据相似模拟原则,进行平面应力相似模拟实验,重点分析了煤层开采且充填完成后覆岩达到稳定状态时的位移和应力变化及特点。通过实验分析,40%宽窄条带间隔充填能显著控制亚关键层基本顶和主关键层的下沉,从而控制覆岩整体运动,使其保持准静态状态;宽窄条带间隔距离小,形成几何不连续、工程效果连续的80m等效大条带,均化应力集中,减轻宽条带承重,满足充填要求;层状岩体的"被夹板弯曲"特点,使得宽窄充填条带上方的岩层相对位移较小,侧向煤壁达到应力集中峰值,但不破坏,满足绿色开采的要求。Taking 13 thcoalseam and 150 m rock strata over the seam of a mine as simulation object,plane stress analogue simulation was made to analyze displacement and stress variation characteristic when overlying strata reached stable state after stowing was finished. Results showed that 40% wide and narrow strip interval stowing could obviously control the subsidence of sub-key basic roof and main-key stratum,thus control whole movement of overlying strata and keep it be in quasi-static state. Small wide and narrow strip interval formed equivalent large strip which was geometrical discontinuous but engineering effect was continuous,and homogenized stress concentration reduced wide strip load and met stowing requirement. The characteristic of plywood bend made the relative displacement of rock strata over stowing strip be small,and stress reach summit value but cannot result into failure,which met the requirement of green mining.

关 键 词：宽窄条带 部分充填 关键层 相似模拟实验 

分 类 号：TD823.7[矿业工程—煤矿开采]