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Inducing mode analysis of rock burst in fault-affected zone with a hard-thick stratum occurrence

机译：厚地层发育断层影响区岩爆诱发模式分析

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摘要

Study of movement characteristics of a hard-thick stratum (HTS) affected by a fault in a coalmine is significant to predict the dynamic hazards (i.e., rock bursts and shock bumps) because of the particular structural and mechanical properties of the HTS and the fault. Hence, using UDEC numerical simulation, the movement characteristic of HTS and fault-slipping law with different mining directions towards the fault were studied. Then, two different inducing modes and corresponding mechanisms of rock burst were obtained. The results show that the structure of overlying strata on two fault walls is different because of fault cutting and fault dip; it results in the HTS of two fault walls presenting different movement stage characteristics. From analysis of fault plane stress and fault slipping, we obtain that footwall mining has higher risk of rock burst than hanging wall mining. Finally, summarizing two different inducing modes of rock burst affected by the HTS and the fault: one that mainly resulted from the strain energy release caused by the HTS obvious bending and failure (i.e., hanging wall mining) and one that notably affected by fault slipping and HTS failure subsidence (i.e., footwall mining). A field case regarding microseismic monitoring is used to verify the numerical simulation results. Study results can serve as a reference for predicting of rock bursts and their classification into hazardous areas under similar conditions.
机译：研究受断层影响的坚硬地层（HTS）的运动特征对于预测动态危险性（例如，岩爆和冲击波）具有重要意义，因为HTS和断层具有特殊的结构和机械特性。因此，利用UDEC数值模拟，研究了高温超导的运动特征和沿不同断层走向的断层滑动规律。然后，获得了两种不同的诱发岩石破裂的方式和相应的机理。结果表明，由于断层切割和断层倾角，两断层上覆岩层结构不同。这导致两个断层墙的高温超导呈现出不同的运动阶段特征。通过对断层面应力和断层滑动的分析，我们得出，下盘开采比挂壁开采具有更高的岩爆风险。最后，总结了高温超导和断层对岩爆的两种不同的诱导方式：一种主要是由于高温超导明显弯曲和破坏（即，悬壁开采）引起的应变能释放，另一种是受断层滑动的显着影响。高温超导破坏沉降（即，下盘开采）。有关微震监测的现场案例用于验证数值模拟结果。研究结果可为预测相似条件下的岩爆和将其分类为危险区域提供参考。

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  • 来源
    《Environmental Geology》 |2019年第15期|467.1-467.13|共13页
  • 作者

    Wang Pu; Jiang Li-shuai; Zheng Peng-qiang; Qin Guang-peng; Zhang Chen;

  • 作者单位

    Shandong Univ Sci & Technol, Dept Resources & Civil Engn, Tai An 271019, Shandong, Peoples R China|Shandong Univ Sci & Technol, Natl Engn Lab Coalmine Backfilling Min, Tai An 271019, Shandong, Peoples R China;

    Shandong Univ Sci & Technol, State Key Lab Min Disaster Prevent & Control Co F, Qingdao 266590, Shandong, Peoples R China|Shandong Univ Sci & Technol, Minist Sci & Technol, Qingdao 266590, Shandong, Peoples R China;

    Shandong Univ Sci & Technol, Dept Resources & Civil Engn, Tai An 271019, Shandong, Peoples R China|Shandong Univ Sci & Technol, Natl Engn Lab Coalmine Backfilling Min, Tai An 271019, Shandong, Peoples R China;

    Shandong Univ Sci & Technol, Dept Resources & Civil Engn, Tai An 271019, Shandong, Peoples R China|Shandong Univ Sci & Technol, Natl Engn Lab Coalmine Backfilling Min, Tai An 271019, Shandong, Peoples R China;

    Shandong Univ Sci & Technol, State Key Lab Min Disaster Prevent & Control Co F, Qingdao 266590, Shandong, Peoples R China|Shandong Univ Sci & Technol, Minist Sci & Technol, Qingdao 266590, Shandong, Peoples R China;

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  • 正文语种 eng
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  • 关键词

    Hard-thick stratum (HTS); Normal fault; Fault slipping; Rock burst;

    机译：硬厚的地层（HTS）;正常故障;断层滑倒;摇滚爆裂;

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