基于微震事件响应分析的采动覆岩损伤时空演化规律

IF 2.1 3区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY
Xiao Yang , Longqing Shi , Mei Qiu , Jin Han , Xingyue Qu , Song Fu
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引用次数: 0

摘要

鄂尔多斯盆地侏罗系煤炭开采面临上覆义军组和漯河组含水砂岩层的威胁,对导水裂隙带与含水层空间关系的动态演化预测提出了挑战。结合岩石梁理论模型和微震监测数据,分析了长壁工作面后退过程中覆岩断裂特征的时空演化。通过对覆岩的力学模型分析,阐明了采动方向(横向)单个岩梁的应力驱动机制,从而建立了覆岩断裂纵向“四区”结构模型(导水区坍塌、岩梁导水区、岩梁弱渗透破坏区和初始阻水区);将导水裂隙带的上边界确定为破坏岩梁弱渗透带。以少寨煤矿1502长壁工作面为研究对象,对生产过程中微震数据进行时空分析,发现微震频率时间序列呈现波动下降趋势,并动态响应岩梁断裂特征。在此基础上,我们将奇异谱分析与距离加权能量算法相结合,对微地震数据进行处理,在74、197、320和432天的工作面推进过程中识别出显著的覆盖层裂缝变化。综合煤系沉积环境、微震事件密度、地层柱等因素,动态确定了上覆岩裂缝边界,导水裂缝带最大发育延伸至安定组泥岩37.46 m层。通过注水试验验证,宜军组和漯河组仍在初始阻水区内,未受采矿活动的干扰。本文提出的“应力场驱动→微震响应→沉积约束”三元分析方法揭示了采动覆岩断裂与微震响应的动态相关性,为制定有效的防治水措施提供了理论依据。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Spatiotemporal evolution patterns of mining-induced overburden damage based on microseismic event response analysis
Jurassic coal mining in the Ordos Basin faces threats from overlying water-bearing sandstone layers of the Yijun and Luohe Formations, posing challenges for predicting the dynamic evolution prediction of spatial relationships between water-conducting fracture zones and aquifers. This study integrated rock beam theoretical models with microseismic monitoring data to analyze the spatiotemporal evolution of overburden fracture characteristics during longwall face retreat. Through mechanical model analysis of the overburden, we elucidated the stress-driving mechanism of individual rock beams in the mining direction (transverse), thereby establishing a longitudinal “four-zone” structural model of overburden fracture (Collapsed water-conducting zone, Rock-beam water-conducting zone, Damaged rock-beam weak-permeability zone, and Initial water-resisting zone), identifying the upper boundary of water-conducting fracture zone as the damaged rock-beam weak-permeability zone. Taking Longwall Face 1502 of Shaozhai Coal Mine as the research object, spatiotemporal analysis of microseismic data during production revealed that microseismic frequency time series exhibited a fluctuating decreasing trend and dynamically responded to rock beam fracture characteristics. Based on this, we applied singular spectrum analysis coupled with a distance-weighted energy algorithm to process microseismic data, identifying significant overburden fracture changes at 74, 197, 320, and 432 days of face advancement. By integrating coal measures depositional environments, microseismic event density, and stratigraphic columns, we dynamically determined the overburden fracture boundary and maximum development of the water-conducting fracture zone extended to the 37.46 m mudstone layer of the Anding Formation. Validation through water injection tests confirmed that the Yijun and Luohe Formations remained within the Initial water-resisting zone, undisturbed by mining activities. The ternary analysis method of “stress field driving → microseismic response → sedimentary constraint” proposed in this study reveals the dynamic correlation between mining-induced overburden fracture and microseismic responses, providing a theoretical foundation for effective water prevention and control measures.
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来源期刊
Journal of Applied Geophysics
Journal of Applied Geophysics 地学-地球科学综合
CiteScore
3.60
自引率
10.00%
发文量
274
审稿时长
4 months
期刊介绍: The Journal of Applied Geophysics with its key objective of responding to pertinent and timely needs, places particular emphasis on methodological developments and innovative applications of geophysical techniques for addressing environmental, engineering, and hydrological problems. Related topical research in exploration geophysics and in soil and rock physics is also covered by the Journal of Applied Geophysics.
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