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首页> 外文期刊>International journal of geomechanics >Strata Behaviors and Rock Burst-Inducing Mechanism under the Coupling Effect of a Hard, Thick Stratum and a Normal Fault
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Strata Behaviors and Rock Burst-Inducing Mechanism under the Coupling Effect of a Hard, Thick Stratum and a Normal Fault

机译：硬厚地层与正断层耦合作用下的地层行为及诱发岩爆的机制

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摘要

The study of strata behaviors of hard, thick stratum (HTS) and faults in underground coal mines is significant to understanding and predicting the mechanism of rock bursts. By considering the occurrence of a HTS and a normal fault (NF), the strata behaviors and rock burst-inducing mechanism were studied using the universal distinct element code (UDEC) numerical simulation and field observation. The results show that prior to failure, a HTS continues to suspend and the lower strata breaks and moves easily because of fault cutting and fault activation. This process induces microseismic events accompanied by the release of a small amount of energy that concentrates near the fault and beneath the HTS. However, the mining stress concentrates and strain energy accumulates in the surrounding rocks because of the large-scale suspension of the HTS, thereby providing sufficient energy for rock bursts to occur. When the HTS suspension increases to the ultimate span, the HTS breaks and slips along the fault plane. Moreover, the fault-plane stress varies notably and the fault slipping is clear. These conditions indicate that the fault activates and destabilizes violently. A large amount of strain energy is released because of the HTS failure and fault slipping, easily inducing violent rock bursts. Hence, the mechanism that induces rock bursts can be divided into two stages: the accumulation of strain energy prior to HTS failure and the release of strain energy because of the coupling effect of HTS failure and fault slipping. In particular, more attention should be paid to the latter stage.
机译：研究地下煤矿硬，厚地层（HTS）和断层的地层行为对理解和预测岩爆机理具有重要意义。考虑到高温超导和正常断层（NF）的发生，利用通用离散元编码（UDEC）数值模拟和现场观测研究了地层行为和岩石破裂诱发机制。结果表明，在发生故障之前，由于断层切割和断层激活，高温超导继续悬挂并且下部地层易于断裂和移动。该过程引起微地震事件，伴随着少量能量的释放，这些能量集中在断层附近和高温超导下方。然而，由于高温超导的大规模悬挂，开采应力集中并且应变能积聚在周围的岩石中，从而为发生岩爆提供了足够的能量。当HTS悬架增加到极限跨度时，HTS断裂并沿着断层平面滑动。此外，断层面应力变化明显，断层滑动明显。这些情况表明该故障会剧烈激活并破坏稳定。由于高温超导破坏和断层滑动，释放了大量的应变能，容易引起剧烈的岩爆。因此，诱发岩爆的机理可以分为两个阶段：高温超导破坏前应变能的积累和高温超导破坏与断层滑动的耦合作用引起的应变能的释放。特别地，应该更加注意后期。

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  • 来源
    《International journal of geomechanics》 |2018年第2期|04017135.1-04017135.14|共14页
  • 作者

    Wang Pu; Jiang Lishuai; Jiang Jinquan; Zheng Pengqiang; Li Wei;

  • 作者单位

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

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

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

    Shandong Univ Sci & Technol, Dept Resources & Civil Engn, Tai An 271000, Shandong, Peoples R China;

    Shandong Univ, Geotech & Struct Engn Res Ctr, Jinan 250061, 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 (NF); Strata behaviors; Fault slipping; Rock burst;

    机译：硬;厚层（HTS）;正断层（NF）;地层行为;断层滑动;岩爆;

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