急倾斜特厚煤层综放工作面采场运移与巷道围岩破裂特征  

Characteristics of stope migration and roadway surrounding rock fracture for fully-mechanized top-coal caving face in steeply dipping and extra-thick coal seam

作　　者：王宁波[1] 张农[1] 崔峰[2,3] 曹建涛[2,3] 来兴平[2,3] 

机构地区：[1]中国矿业大学矿业工程学院,江苏徐州221116 [2]西安科技大学能源学院,陕西西安710054 [3]教育部西部矿井开采及灾害防治重点实验室,陕西西安710054

出　　处：《煤炭学报》2013年第8期1312-1318,共7页Journal of China Coal Society

基　　金：国家自然科学基金资助项目(10772144);陕西省重点科技创新团队计划资助项目(2013KCT-16);陕西省自然科学研究计划重点资助项目(2011JZ010)

摘　　要：急倾斜煤层的赋存环境及水平分段综放的开采方式加剧了综放工作面采场结构与应力演化的复杂性,增加了综放工作面稳定性评估的难度,为此采用多手段联动的方法对煤岩体结构与巷道围岩破裂特征进行综合探测。通过急倾斜煤层综放工作面覆岩结构与应力分析巷道围岩产生分区破裂的力源条件;基于钻孔应力监测、声波探测、光学钻孔摄像等监测方法,获得了巷道围岩质量与离层区分布位置,钻孔内壁裂隙发育程度、裂隙数量与长度以及动态破裂演化特征。综合分析表明:急倾斜特厚煤层巷道围岩破碎具有分区分布特征,顶板与两帮裂隙呈现不规则的分区演化特征,裂隙区与完整区交替出现,煤体侧巷道帮的裂隙分布区域大于岩体侧。The occurrence environment of steeply dipping coal seams and mining by sublevel top-coal caving further aggravate the complexity of stope structure and stress evolution in fully mechanized top-coal caving face, increasing the difficulty of assessing working face stability. Therefore, the mode of multi-method comprehensive detection for coal and rock mass structure and fracture characteristics of surrounding rock in mining roadway was put forward. The conditions of force source for generating zonal disintegration in surrounding rock were analyzed through the overburden structure and stress in fully mechanized top-coal caving face at steeply dipping coal seams, based on the detection methods of stress monitoring, sound wave exploration and optical borehole camera etc, the quality of surrounding rock and separa- tion area location, development degree of crack, fracture number and length on hole wall as well as the dynamic rupture evolution characteristics within the detection zone were obtained. Comprehensive analysis shows that the crushing of surrounding rock fracture in steeply dipping coal seams has the characteristics of partition distribution, the crack char- acteristics of irregular partition evolution occurs in roof and two sides of roadway for fracture, fracture zone and intact zone appear alternately, the distribution area of surrounding rock fracture in coal mass side is larger than the rock side.

关 键 词：急倾斜特厚煤层 声波探测 光学摄像 分区破裂 动态演化 

分 类 号：TD823.21[矿业工程—煤矿开采] TD823.25[矿业工程—矿山开采]