摘要
针对煤层上方坚硬厚层砂岩顶板在工作面回采时发生破断滑移,弹性能瞬间释放进而导致强动压灾害的问题,以枣泉煤矿130205工作面为研究现场,采用长水平孔区域水力压裂技术手段提前对工作面顶板上覆砂岩层位进行处理,释放了砂岩内部积聚的弹性能,以微震监测系统和工作面矿压分析作为主要监测评价手段,通过对比130205工作面压裂区域和未压裂区域微震事件频次、能量和支架压力分布情况,发现采用长水平孔区域水力压裂技术可以有效减缓矿压显现,10^(4) J以上微震能量事件频次明显降低;超前支承压力影响范围平均由124.47 m降低为66.12 m,应力集中系数平均由3.04降低为1.40,应力峰值由15.37 MPa降低为10.78 MPa。
In response to the problem of fracture and sliding of the hard and thick sandstone roof above the coal seam during mining,and the instantaneous release of elastic energy leading to strong dynamic pressure disasters,taking the 130205 working face of Zaoquan coal mine as the research site,the long horizontal hole area hydraulic fracturing technology was used to pre treat the overlying sandstone layer on the working face roof,releasing the elastic energy accumulated inside the sandstone.The microseismic monitoring system and mining pressure analysis of the working face were used as the main monitoring and evaluation methods.By comparing the frequency,energy,and support pressure distribution of micro-seismic events in the fractured and un fractured areas of the 130205 working face,it was found that using the long horizontal hole area hydraulic fracturing technology can effectively slow down the occurrence of mining pressure,and the frequency of micro-seismic energy events above 10^(4) J was significantly reduced;the average range of influence of advanced support pressure has decreased from 124.47 m to 66.12 m,the average stress concentration coefficient has decreased from 3.04 to 1.40,and the peak stress has decreased from 15.37 MPa to 10.78 MPa.
作者
侯树宏
赵凯
杜昭
庞立宁
HOU Shuhong;ZHAO Kai;DU Zhao;PANG Lining(CHN Energy Ningxia Coal Industry Co.,Ltd.,Yinchuan 750011,China;Zaoquan Coal Mine,CHN Energy Ningxia Coal Industry Co.,Ltd.,Yinchuan 751400,China;CCTEG Coal Mining Research Institute,Beijing 100013,China)
出处
《煤炭技术》
2025年第4期47-52,共6页
Coal Technology
关键词
坚硬厚层砂岩顶板
强动压灾害
长水平孔区域压裂
微震监测
hard and thick sandstone roof
strong dynamic pressure disasters
fracturing in long horizontal hole area
micro-seismic monitoring
