摘要
定向水力致裂能够有效降低坚硬顶板的强度和完整性,从而能够弱化顶板破坏时的能量释放和动力效应。采用定向水力致裂处理坚硬顶板,处理方式包括顶板分层和切断悬顶。为了研究定向水力致裂处理顶板起到的防冲效果,采用UDEC离散元分析软件对顶板致裂前后系统释放能量和系统动能进行了计算,研究结果表明顶板致裂后降低了系统释放能量和系统动能,从而减少顶板和煤体能量积聚,降低了冲击地压发生的危险性。
Aiming at the main influencing factors of rockburst, the hard roof directional hydraulic fracture is used to deal with the hard roof. The length of the hanging roof is reduced by cutting hard roof and thickness of the roof is reduced by stratifying hard roof. In order to analyze the effect of rockburst prevention, UDEC discrete element method software is used to simulate the changes of released energy and kinetic energy of the model system before and after cracking the roof. The results show that released energy and kinetic energy of the model system are reduced after cracking roof and there are little energy accumulation of the roof and coal seam,thus rockburst rick is reduced.
出处
《西安科技大学学报》
CAS
2012年第4期444-449,共6页
Journal of Xi’an University of Science and Technology
基金
国家重点基础研究发展规划(973)资助项目(2010CB226806)
关键词
水力致裂
冲击地压
致裂效果
防冲
directional hydraulic fracture
rockburst
effect of fracturing
rockburst prevention
