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Numerical simulation research on response characteristics of surrounding rock for deep super-large section chamber under dynamic and static combined loading condition

动静载荷下深部超大断面硐室围岩响应特性的数值模拟研究

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Abstract

The stability control of surrounding rock for large or super-large section chamber is a difficult technical problem in deep mining condition. Based on the in-site geological conditions of Longgu coal mine, this paper used the dynamic module of FLAC3D to study the response characteristics of deep super-large section chamber under dynamic and static combined loading condition. Results showed that under the static loading condition, the maximum vertical stress, deformation and failure range are large, where the stress concentration coefficient is 1.64. The maximum roof-to-floor and two-sides deformations are 54.6 mm and 53.1 mm, respectively. Then, under the dynamic and static combined loading condition: (1) The influence of dynamic load frequency on the two-sides is more obvious; (2) The dynamic load amplitude has the greatest influence on the stress concentration degree, and the plastic failure tends to develop to the deeper; (3) With the dynamic load source distance increase, the response of surrounding rock is gradually attenuated. On this basis, empirical equations for each dynamic load conditions were obtained by using regression analysis method, and all correlation coefficients are greater than 0.99. This research provided reference for the supporting design of deep super-large section chamber under same or similar conditions.

摘要

大及超大断面硐室围岩稳定性控制是深部开采条件下的关键技术难题. 本文根据龙固煤矿筛分产品转运硐室实际地质条件, 利用 FLAC3D 中的 Dynamic 模块系统地研究了动静载荷影响下深部超大断面硐室围岩响应特性. 结果表明: 静载作用下围岩最大垂直应力、 变形量及破裂范围均较大, 其中应力集中系数为 1.64, 顶底板及两帮最大变形量分别为 54.6 mm 和 53.1 mm. 之后在动静载荷叠加扰动下, 硐室围岩响应将发生进一步变化: (1)动载扰动频率对两帮的影响较为明显, 动载频率 160 Hz 时的两帮变形量较10 Hz 时增大了 50.1%; (2)动载强度对于围岩应力集中程度的影响最大, 应力集中系数最大为 2.38, 塑性破坏更多的向围岩深部发展; (3)随着动载源与硐室距离的增加, 硐室围岩响应在阻尼的作用下逐渐衰减并趋于静载状态. 在此基础上, 采用回归分析的方法获得了不同动载条件下的围岩响应经验方程, 相关性系数均大于 0.99. 本研究成果可为相同或相似条件下深部超大断面硐室围岩稳定性控制及支护设计提供参考和借鉴.

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Authors and Affiliations

  1. School of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao, 266590, China

    De-yuan Fan  (范德源), Xue-sheng Liu  (刘学生), Yun-liang Tan  (谭云亮), Shi-lin Song  (宋世琳), Jian-guo Ning  (宁建国) & Qing Ma  (马庆)

  2. State Key Laboratory of Mining Disaster Prevention and Control, Shandong University of Science and Technology, Qingdao, 266590, China

    Xue-sheng Liu  (刘学生), Yun-liang Tan  (谭云亮) & Jian-guo Ning  (宁建国)

  3. State Key Laboratory of Water Resource Protection and Utilization in Coal Mining, China Energy Group Co., Ltd., Beijing, 100011, China

    Xue-sheng Liu  (刘学生)

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  1. De-yuan Fan  (范德源)
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Contributions

The overarching research goals were developed by FAN De-yuan, LIU Xue-sheng and TAN Yun-liang. FAN De-yuan established the calculation model. SONG Shi-lin and MA Qing analyzed the calculated results. NING Jian-guo conducted the literature review. The initial draft of the manuscript was written by FAN De-yuan and LIU Xue-sheng. All authors replied to reviewers’ comments and revised the final version.

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Correspondence to Xue-sheng Liu  (刘学生).

Ethics declarations

FAN De-yuan, LIU Xue-sheng, TAN Yun-liang, SONG Shi-lin, NING Jian-guo and MA Qing declare that they have no conflict of interest.

Additional information

Foundation item: Project(2018YFC0604703) supported by the National Key R&D Program of China; Projects(51804181, 51874190) supported by the National Natural Science Foundation of China; Project(ZR2018QEE002) supported by the Shandong Province Natural Science Fund, China; Project(ZR2018ZA0603) supported by the Major Program of Shandong Province Natural Science Foundation; Project(2019GSF116003) supported by the Key R&D Project of Shandong Province; Project(SDKDYC190234) supported by the Shandong University of Science and Technology, Graduate Student Technology Innovation Project, China

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Fan, Dy., Liu, Xs., Tan, Yl. et al. Numerical simulation research on response characteristics of surrounding rock for deep super-large section chamber under dynamic and static combined loading condition. J. Cent. South Univ. 27, 3544–3566 (2020). https://doi.org/10.1007/s11771-020-4509-5

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