摘要
掘进巷道贯通期间应力集中易诱发冲击地压灾害,保障巷道安全掘进贯通具有重要意义。以新疆乌东煤矿急倾斜巨厚煤层巷道的贯通掘进为背景,采用FLAC^(3D)数值模拟方法,分析了巷道贯通期间围岩应力和能量分布特征及演化规律;制定了急倾斜巨厚煤层巷道贯通期间的冲击地压防控策略和方案;利用多项微震物理指标,分析了巷道贯通期间能量的时序变化特征,并对卸压效果进行了评估。结果表明:巷道垂直应力、水平应力、能量峰值随着贯通距离的逐渐减少均有增大的趋势,应力和能量集中区域主要出现在两掘进面之间;接近贯通位置50~120 m时,微震能量频次增加,b值出现骤降趋势,S值、EEM值出现逐渐递增趋势;巷道即将贯通时,微震频次有较大幅度的上下波动,能量出现少量异常高值,b值再次迅速下降,S值下降至低值,EEM值骤降至极小值;卸压后单日平均释放总能量下降了60.7%;单日总频次下降了62.8%;b值、S值、EEM值能很好地反映巷道掘进时煤岩的活动特征,在反掘段内均未偏离正常水平,卸压防控措施效果良好。研究结果可对急倾斜巨厚煤层掘进巷道贯通期间冲击地压的防治提供借鉴与参考。
The stress concentration during connection of drivage roadways tends to induce rock burst disaster,and it is of great significance to ensure the safety of tunnelling.Taking the connection of drivage roadways in the steeply inclined ultra-thick coal seam of Wudong Coal Mine,Xinjiang Province,as the research object,the FLAC^(3D)numerical simulation method was used to analyze the stress and energy distribution characteristics,as well as the evolution of the surrounding rock during the connection of drivage roadways.The prevention and control strategy and plan of rock burst during the connection of drivage roadways of steeply inclined ultra-thick coal seam were formulated.Based on multiple microseismic physical indexes,the characteristics of energy time series variation during connection of roadways penetration were analyzed and the effect of pressure relief was evaluated.The results show that the peak value of vertical stress,horizontal stress and energy increases with the decreasing of the penetrating distance,and the concentrated area of stress and energy mainly occur between the two driving faces.When approaching the penetrating position 50~120 m,the frequency of microseismic energy increases,the b value shows a sudden decline trend,and the S value and EEM value show a gradual increasing trend.When two lanes are about to connect,the microseismic frequency fluctuates up and down greatly,the energy appears a small amount of abnormal high value,the b value drops rapidly again,the S value drops to a low value,and the EEM value drops sharply to a minimum value.Statistics show that the average daily total energy released after pressure relief decreases by 60.7%.The total daily frequency decreases by 62.8%;b value,S value and EEM value can well reflect the activity characteristics of coal and rock in roadway excavation,and do not deviate from the normal level in the reverse excavation section,and the pressure relief prevention and control measures are effective.The research results could provide a reference for the prevention and control of rock burst during the connection of drivage roadways in steeply inclined ultra-thick coal seam.
作者
冯攀飞
朱红伟
宗程
崔峰
刘江峰
FENG Panfei;ZHU Hongwei;ZONG Cheng;CUI Feng;LIU Jiangfeng(CHN Energy Xinjiang Energy Co.,Ltd.,Urumqi 830027,China;College of Energy and Mining Engineering,Xi’an University of Science and Technology,Xi’an 710054,China;Key Laboratory of Xinjiang Coal Resources Green Mining Ministry of Education,Xinjiang Institute of Engineering,Urumqi 830023,China;Xinjiang Engineering Research Center of Green Intelligent Coal Mining,Xinjiang Institute of Engineering,Urumqi 830023,China)
出处
《西安科技大学学报》
北大核心
2025年第3期512-523,共12页
Journal of Xi’an University of Science and Technology
基金
国家自然科学基金项目(52422404)
新疆煤炭资源绿色开采教育部重点实验室开放课题项目(KLXGY-KA2501)。
关键词
急倾斜巨厚煤层
巷道贯通
冲击地压
数值模拟
微震物理指标
steeply inclined ultra-thick coal seam
roadways connection
rock burst
numerical simulation
microseismic physical indexs
作者简介
第一作者:冯攀飞,男,陕西咸阳人,高级工程师,E-mail:162160986@qq.com;通信作者:崔峰,男,河南新乡人,教授,博士生导师,E-mail:cuifeng9418@163.com。
