摘要
沿空巷道是冲击地压频发难防治区域,分析其围岩应力分布状态是研究冲击地压防控的关键.通过研究常规工作面与错层位工作面沿空巷道围岩支承压力分布特征及对沿空巷道冲击危险性进行评价得到如下结论:1)错层位工作面梯形煤体位于砌体梁结构掩护下,处于低应力区,其实体煤侧应力峰值与极限平衡区宽度均略小于常规工作面开采的;2)留宽煤柱掘巷时,煤柱内易形成高应力集中;窄煤柱沿空掘巷,实体煤侧支承压力峰值增大,极限平衡区宽度减小,应力集中程度明显增高;负煤柱沿空巷道始终仍处于低应力区,实体煤侧应力峰值无增幅,而实际极限平衡区宽度增大,因此应力集中程度明显降低,实现了集中应力向深部煤体转移的效果,起到了降压的作用;3)负煤柱沿空巷道周围煤岩体中储能低,当能量释放时却耗能多,负煤柱沿空巷道冲击危险性更低.华丰煤矿实践案例证明,负煤柱巷道布置有利于沿空巷道冲击地压防治,并实现了安全高效生产.
Gob-side entry is the area where rock burst occurs frequently which is difficult to prevent and control. Analyzing the stress distribution of surrounding rock is the key to studying the prevention of rock burst. Based on the distribution characteristics of the surrounding rock abutment pressure around the gob-side entry with conventional and split-level, the rock burst risk of the gob-side entry was studied. The results show that the trapezoidal coal body in split-level panel is located under the cover of voussoir structure and in a low-stress area. With lower abutment pressure, the limit equilibrium zone width of solid coal side is smaller than that of the conventional. When driving roadways with wide coal pillars, high stress concentration is easy to form in coal pillars. When driving roadways with narrow coal pillars, the peak of abutment pressure increases, the width of the limit equilibrium zone decreases, and the degree of stress concentration increases significantly. However, the gob-side entry with negative coal pillars is in the low-stress area, when the peak stress of abutment pressure does not increase. The actual limit equilibrium width is enlarged, so the stress concentration degree is obviously reduced, which realizes the effect of transferring the concentrated stress to the deep coal body and plays the role of pressure avoidance. The negative coal pillar gob-side entry with lower rock burst risk has low energy storage and high energy consumption in the coal and rock masses. The safe and efficient production of Huafeng coal mine proved that the layout of negative coal pillar gob-side entry is beneficial to the prevention of rock burst.
作者
王志强
王鹏
石磊
吕文玉
苏泽华
武超
张焦
赵景礼
WANG Zhiqiang;WANG Peng;SHI Lei;Lü Wenyu;SU Zehua;WU Chao;ZHANG Jiao;ZHAO Jingli(School of Energy and Mining Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China;State Key Laboratory of Coal Resources in Western China,Xi’an University of Science and Technology,Xi’an,Shaanxi 710054,China;Beijing Key Laboratory for Precise Mining of Intergrown Energy and Resources,National Demonstration Center for Experimental Safe Coal Mining and Geological Guarantee Education,China University of Mining and Technology(Beijing),Beijing 100083,China)
出处
《中国矿业大学学报》
EI
CAS
CSCD
北大核心
2020年第6期1046-1056,共11页
Journal of China University of Mining & Technology
基金
国家自然科学基金项目(51774289)
国家自然科学基金青年基金项目(51404270)
西部煤炭绿色安全开发国家重点实验室开放基金项目(SKLCRKF1903)。
关键词
沿空巷道
冲击地压
负煤柱
应力转移
错层位
gob-side entry
rock burst
negative pillar
stress transfer
split-level
