基于微震监测及岩体损伤模型的露天–地下联合开采岩移过程数值模拟研究

doi:10.13722/j.cnki.jrme.2023.0151

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摘要为研究矿山露天–地下联合开采过程中围岩移动变化过程，以大红山铁矿露天–地下联合开采工程为依托，处理A34～A37勘探线间的微震事件，并对该微震事件时空分布规律进行研究。同时，推导可嵌入数值模拟中的基于微震事件的岩体损伤模型，利用该模型初步分析得到A34～A37勘探线间联采过程中岩体损伤及岩移发展过程，初步认为截至2019年，F2断层对地下矿开采导致的岩体移动的抑制作用基本失效，仅775 m标高附近的抑制效果存在，确定围岩陷落角为79.3°，移动角为74°。为确认基于微震监测的岩体损伤模型数值模拟计算的可靠性，采用随机介质放矿理论，结合现场实测地表塌陷情况，对数值模拟分析得到的岩移结论进行验证。研究可为类似矿山露天–地下联合开采岩移分析等提供一定参考。

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关键词 ：岩石力学, 露天&ndash, 地下联合开采, 微震监测, 岩体损伤, 数值模拟, 岩体移动

Abstract：In order to study the temporal and spatial variations in surrounding rock displacement during the process of combined open-pit and underground mining，this study focuses on the Dahongshan iron mine combinded open-pit and underground mining project. Specifically，the microseismic events occurring between exploration lines A34 and A37 were examined to discern the patterns of their distribution. Moreover，a novel rock damage model，incorporating microseismic events，was developed and integrated into numerical simulations to analyze the progressive rock damage and displacement within the combined mining zone of exploration lines A34–A37. It is worth noting that the preliminary findings indicate that the inhibitory effect of the F2 fault on rock mass movement resulting from underground mining has become largely ineffective，except for a localized inhibitory effect near the 775 m elevation. Consequently，the estimated collapse angle of the surrounding rock is determined to be 79.3°，while the displacement angle amounts to 74°. To ascertain the reliability of the numerical simulations based on the microseismic monitoring-derived rock damage model，stochastic medium ore drawing theory，along with field measurements of surface subsidence，was employed to validate the simulated conclusions concerning rock displacement. Encouragingly，the outcomes of the validation process confirm the credibility and robustness of the simulation results. Overall，this research makes significant contributions to the analysis of rock mass displacement in the context of combined open-pit and underground mining，thereby providing invaluable insights and serving as a fundamental reference for future investigations in this domain.

Key words： rock mechanics combined open-pit and underground mining microseismic monitoring rock mass damage numerical simulation rock mass movement

引用本文:

侯俊旭1，2，杨天鸿1，2，赵永1，2，马凯1，2，马庆山1，2，邓文学1，2，张玮3，董越权3. 基于微震监测及岩体损伤模型的露天–地下联合开采岩移过程数值模拟研究[J]. 岩石力学与工程学报, 2024, 43(S1): 3243-3256.
HOU Junxu1，2，YANG Tianhong1，2，ZHAO Yong1，2，MA Kai1，2，MA Qingshan1，2，. Numerical simulation of rock moving process of combined open-pit and underground mining based on microseismic monitoring and #br# rock mass damage model. , 2024, 43(S1): 3243-3256.

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https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2023.0151 或 https://rockmech.whrsm.ac.cn/CN/Y2024/V43/IS1/3243

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