摘要
为探讨近距离煤层群工作面采场围岩失稳机制和开发相应的控制技术,采用理论计算、数值模拟和实验室试验综合方法,研究煤层群开采围岩采动应力场分布。阐明松散煤体注水加固的力学机制,并开发现场厚坚硬顶板深孔预裂爆破、深浅孔联合注水、新型采煤工艺综合技术措施。研究结果表明:在煤层群开采条件下,上下工作面相互影响程度剧烈,将下伏煤层工作面布置在上覆煤层开采后的卸压区内,可避免上煤层遗留煤柱高集中应力的影响,降低下伏煤层工作面原始应力水平。用设计的深孔预裂爆破工艺,能避免关键层断裂后对下伏煤层作面的动压冲击。提出的工作面低压短时间浅孔注水和2巷超前长孔预注水工艺,能提高松散煤体抗剪强度,增加煤体稳定性。
For the sake of exploring the mechanism of instability of surrounding rock of stopes in close distance coal seams and developing a technology for controlling the instability,distribution of mining pressure field under coal seam group mining was studied by means of calculation,simulation and laboratory experiments.A mechanical mechanism of water injection reinforcement was illustrated.Comprehensive technical measures of the deep-hole presplitting explosion,the short-hole water infusion at working face and the deep-hole water infusion in haulage roadway and coal mining technology were worked out.The research shows that two working faces influence each other tempestuously,that if the under working face is arranged in the distressed zone of the upper working face,then the original stress of the upper working face can be reduced,that the deep-hole presplitting explosion can be used to avoid the shock to the under working face for the key stratum fracture,that the short-hole water infusion at working face and the deephole water infusion in haulage roadway can be used to improve the shear strength of loose coal and the stability of coal wall.
作者
李家卓
谭文峰
李传明
朱传奇
马海峰
LI Jiazhuo TAN Wenfeng LI Chuanming ZHU Chuanqi MA Haifeng(Anhui Province Key Laboratory Sponse and Disaster Prevention and Control in Deep Coal Mine, Anhui University of Science and Technology, Huainan Anhui 232001, China School of Mining and Safety Engineering, Anhui University of Science and Technology, Huainan Anhui 232001, China Shandong Xinjulong Energy Limited Liability Company,Heze Shandong 274918 ,China)
出处
《中国安全科学学报》
CAS
CSCD
北大核心
2017年第5期122-127,共6页
China Safety Science Journal
基金
国家自然科学基金煤炭联合基金重点资助(U1361208)
安徽省自然科学基金资助(1408085MKL42)
安徽理工大学青年教师科学研究基金资助(12859)
安徽理工大学博士基金资助
关键词
近距离煤层群
松散煤体
采场围岩
失稳机制
开采工艺
close distance coal seams group
loose coal
surrounding rock
instability mechanism
mining technology
