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隧道与地下工程灾害防治  2021, Vol. 3 Issue (3): 29-35    DOI: 10.19952/j.cnki.2096-5052.2021.03.04
  先进计算方法在隧道与岩土工程中的应用 本期目录 | 过刊浏览 | 高级检索 |
考虑顶板下沉效应的煤体卸荷动态断裂数值模拟
张振南,杨跃宗
上海交通大学船舶海洋与建筑工程学院, 上海 200240
Numerical simulation of dynamic fracturing behaviors of abruptly unloaded coal with consideration of roof subsidence
ZHANG Zhennan, YANG Yuezong
School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiaotong University, Shanghai 200240, China
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摘要 为揭示巷道开挖或采矿过程中的煤体动态断裂规律,采用离散虚内键(discretized virtual internal bond,DVIB)方法对突然卸荷条件下的煤体动态断裂进行研究。结果表明,突然卸荷动态断裂具有显著的三阶段特征:初始破坏、稳定破坏和加速破坏阶段。本研究考虑顶板下沉作用,定量地总结了煤岩体卸荷过程中裂纹面随时间的演化规律。随着地应力增大,初始和加速阶段的动态断裂过程更为剧烈,稳定阶段的持续时间也更短。顶板下沉速率对初始破坏阶段基本没有影响;随着顶板下沉速率的增大,稳定和加速破坏阶段的破坏程度增强。围岩刚度越大,稳定破坏阶段的持续时间就越长。本研究对于冲击地压的预测和防治具有较重要的参考意义。
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张振南
杨跃宗
关键词:  煤爆  顶板下沉  动态断裂  煤岩体  卸荷    
Abstract: To explore the dynamic fracture regularities of coal body under abrupt unloading with consideration of roof subsidence, the discretized virtual internal bond method was used to simulate the dynamic fracture process of the rock-coal-rock body under unloading condition. It was found that the dynamic fracture exhibited three-stage characteristics, namely the initial, the stable and the accelerated failure stage. With consideration of the roof subsidence, a quantitative fracture evolution function was drawn. With the initial in-situ stress increasing, the dynamic fracture in the initial and the accelerated failure stages was more violent, and the duration of the stable failure stage became shorter. The roof subsidence rate had little effect on the initial failure stage. With the roof subsidence rate increasing, the dynamic fracture in the stable and the accelerated failure stages was more violent. With the surrounding rock stiffness increasing, the duration of stable failure became longer. These findings provided valuable reference for the prediction of coal burst.
Key words:  coal burst    roof subsidence    dynamic fracture    coal-rock body    unloading
收稿日期:  2021-06-11      修回日期:  2021-08-23      发布日期:  2021-09-20     
中图分类号:  TD82  
基金资助: 国家自然科学基金资助项目(11772190)
作者简介:  张振南(1974— ),男,黑龙江木兰人,博士,教授,博士生导师,主要研究方向为岩石断裂破坏力学与数值模拟. E-mail:zhennanzhang@sjtu.edu.cn
引用本文:    
张振南, 杨跃宗. 考虑顶板下沉效应的煤体卸荷动态断裂数值模拟[J]. 隧道与地下工程灾害防治, 2021, 3(3): 29-35.
ZHANG Zhennan, YANG Yuezong. Numerical simulation of dynamic fracturing behaviors of abruptly unloaded coal with consideration of roof subsidence. Hazard Control in Tunnelling and Underground Engineering, 2021, 3(3): 29-35.
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http://tunnel.sdujournals.com/CN/Y2021/V3/I3/29
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