摘要
为了揭示工作面回采速度与顶板弯曲变形能相关性,采用理论分析、数值模拟和现场实测方法,首先研究了回采速度效应下顶板能量积聚规律,然后分析了顶板能量释放特征,最后探讨了回采速度影响下顶板能量积聚释放机制。结果表明:随着加载速率增大,岩梁的抗拉强度呈线性增大趋势,而积聚能量呈指数型增加趋势;随着回采速度增加,顶板释放能量也呈指数型增加趋势;工作面回采速度为5.0～6.0 m/d时,微震活动为高能量低频次,而保持在4.0 m/d左右时,微震活动为低能量高频次;回采速度由慢变快时,顶板积聚能量增加的本质是受到的加载速率增大,而能量释放的本质是增加的弹性能致使煤岩系统的非稳定动态平衡被打破,从而诱发冲击地压。
In order to reveal the relation characteristics between the stoping speed and the roof deformation energy,this paper first studied the energy accumulation law of roof under the stoping speed effect by theoretical analysis and numerical simulation,and then analyzed the energy release characteristic of roof by field monitoring.At last,the energy accumulation and release mechanism of roof is discussed.Results show:when the loading rate increases,the tensile strength of roof beam increase linearly,and the accumulated energy of roof shows an exponential growth trend;the increase of released energy of roof shows an exponential trend as increasing the stoping speed;when the stoping speed is 5.0~6.0 m/d,the microseismic activity is high energy and low frequency,but when the stoping speed is about 4.0 m/d,it is low energy and high frequency;when the stoping speed increases,the essence of accumulated energy increase of roof is the increase of loading rate,and the essence of energy release is that the increased elastic energy destroys the unstable dynamic balance of coal-rock system,which might induce rock burst.
作者
赵同彬
郭伟耀
韩飞
顾士坦
ZHAO Tongbin;GUO Weiyao;HAN Fei;GU Shitan(State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology,Qingdao 266590,China;National Demonstration Center for Experimental MiningEngineering Education,Shandong University of Science and Technology,Qingdao 266590,China;DongtanCoal Mine,Yanzhou Coal Mining Company Limited,Zoucheng 273500,China)
出处
《煤炭科学技术》
CAS
北大核心
2018年第10期37-44,共8页
Coal Science and Technology
基金
国家重点研发计划资助项目(2016YFC0801401)
国家自然科学基金资助项目(51674160)
泰山学者优势特色学科人才团队支持计划资助项目
关键词
回采速度
顶板
能量积聚
能量释放
微震
stoping speed
roof
energy accumulation
energy release
microseismic
