上下采空极近距离煤层开采围岩应力及破坏特征研究  

Stress and failure characteristics of surrounding rock in the extremely close distance coal seams group mining after the upper and lower coal seam mining

作　　者：张向阳[1] 常聚才[1] 

机构地区：[1]安徽理工大学能源与安全学院煤矿安全高效开采省部共建教育部重点实验室,安徽淮南232001

出　　处：《采矿与安全工程学报》2014年第4期506-511,共6页Journal of Mining & Safety Engineering

基　　金：国家自然科学基金项目(51204006);安徽省高等学校省级自然科学研究项目(KJ2013A098)

摘　　要：针对极近距离煤层群开采过程中出现的上下采空后进行中间煤层开采的具体工程条件,运用数值模拟、相似模拟和工程实践相结合的研究方法,分析了上下采空极近距离煤层开采过程中采场围岩应力分布规律、位移变化及变形破坏特征。研究表明:在煤层厚度不大、顶底板岩层基本稳定和采高3 m左右情况下,上下采空极近距离煤层开采中,煤层及顶底板整体应力有所降低,且其完整性没有受到严重破坏;而在工作面两巷外侧一定范围围岩应力集中程度明显加强,在工作面切眼和收作线煤壁附近35 m范围内,形成一定范围的剪切破裂区。在上下采空极近距离煤层开采中,应加强两巷修护与加固,合理布置工作面以避开应力集中区和剪切破裂区,并采取相应矿压控制措施,保证工作面正常安全开采。In response to the engineering specifications of the middle coal seam mining after the upper and lower coal seam mining during the extremely close distance coal seam group mining, by adopting the numerical simulation, analog simulation and the engineering practice, the stress distribution, the dis-placement variation characteristics and the fracture of the stope surrounding rock during the extremely close distance coal seam mining has been analyzed. Results show that the roof and floor stress decreases, and its integrity isn’t badly damaged during the extremely close distance coal seam mining when the coal seam is not thick, the roof and floor rocks are relatively stable and the mining height are about 3 meters. While the surrounding rock stress concentration strengthens significantly at the range of the dis-trict sublevel entry outside. It forms a shear fracture zone 35 m near to the open-off cut and terminal line. During the extremely close distance coal seam mining, repair and reinforcement for the two roadways should be strengthened and the working face should be reasonably arranged to avoid the high stress zone and the shear fracture zone. Meanwhile the corresponding underground pressure control measures should be taken, ensuring the working face safety mining.

关 键 词：上下采空 极近距离煤层 煤层群开采 围岩应力 围岩破坏特征 

分 类 号：TD323[矿业工程—矿井建设]