摘要
针对褶曲构造区围岩采动应力分布不均造成的应力集中区易诱发强矿压灾害,以张双楼煤矿74104工作面为背景,基于数值模拟和现场监测对褶曲构造区围岩采动应力演化规律和分布特征进行了研究。研究表明:褶曲构造区围岩特征点(脊点、槽点、拐点和转折端)附近区域应力集中程度高于其他区域。工作面回采过程中,特征点应力集中程度最严重位置一开始位于拐点处,其次是脊点、槽点和转折端;随工作面推进,脊点及其附近转折端处应力集中程度逐渐增大最终成为集中程度最大区域,集中系数达2.08,其次是拐点和槽点及其附近转折端处。对于曲率越大的褶曲构造区,工作面回采后,其应力分布越不均匀,褶曲轴部和两翼拐点处的应力集中程度高;反之,曲率越小,回采后其应力分布较为均匀。针对74104工作面褶曲构造区围岩特征点(脊点、拐点)高应力集中区,提出了顶板预裂爆破卸压技术,并采用数值模拟和微震监测对卸压效果进行评价。结果表明:褶曲构造区顶板预裂爆破后,特征点(脊点和拐点)区域应力集中程度分别降低了37.5%和39%,最大微震能量降低了66.7%。降低了该区域强矿压灾害风险,保障了工作面安全开采。
Stress concentration areas caused by the uneven distribution of mining stress in the surrounding rock of the fold structure area is likely to induce strong mine pressure disasters.In this study,based on the background of the 74104 working face of Zhangshuanglou Coal Mine,the evolution and distribution characteristics of mining stress of surrounding rock in the fold structure area were researched through numerical simulation and field monitoring.The results indicate that the stress concentration in the area around the characteristic points(ridge point,trough point,inflection point and turning point)of the surrounding rock in the fold structure area is higher than that in other areas.In the process of mining,the most serious stress concentration occurs at the inflection point at the beginning,followed by the ridge point,the trough point,and the turning point in sequence.As the working face advances,the ridge point and its nearby turning point witness an increasingly concentrated stress and eventually become the largest area of stress concentration,with a concentration coefficient of 2.o8,followed by the inflection point and the trough point and their nearby turning points.For the fold structure area with a greater curvature,the stress distribution is more uneven after mining,and the stress is highly concentrated at the fold crank shaft and the inflection points of the two wings.Conversely,for the fold structure area with a smaller curvature,the stress is more evenly distributed after mining.Targeting the high stress concentration area around the characteristic points(ridge point and inflection point)of surrounding rock in the fold structure area of the working face 74104,the pressure relief technology of pre-spliting blasting at the roof was proposed,and the pressure relief effect was evaluated on the basis of numerical simulation and microseismic monitoring.After the application of the proposed technology,the stress concentration degrees at the characteristic points(ridge point and inflection point)are reduced by 37.5% and 39%,respectively,and the maximum microseismic energy is reduced by 66.7%.The technology serves to lower the risk of strong mine pressure disasters in this area and ensure safe mining of the working face.
作者
唐龙
屠世浩
屠洪盛
张雷
李文龙
苗凯军
赵宏斌
马杰阳
TANG Long;TU Shihao;TU Hongsheng;ZHANG Lei;LI Wenlong;MIAO Kaijun;ZHAO Hongbin;MA Jieyang(School of Mines,China University of Mining and Technology,Xuzhou,Jiangsu 221116,China;Xuzhou Mining Business Group,Xuzhou,Jiangsu 221018,China)
出处
《采矿与安全工程学报》
北大核心
2025年第3期636-647,共12页
Journal of Mining & Safety Engineering
基金
国家自然科学基金项目(51874281)
国家自然科学基金青年科学基金项目(52004270)
江苏省研究生科研与实践创新计划项目(KYCX22_2612)。
关键词
褶曲构造区
采动应力演化
顶板爆破卸压
数值模拟
fold tectonic area
mining stress evolution
roof blasting relief
numerical simulation
