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Effects of confining pressure on deformation failure behavior of jointed rock

围压对节理岩体变形破坏行为的影响

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Abstract

for a deeper understanding of the deformation failure behavior of jointed rock, numerical compression simulations are carried out on a rock specimen containing non-persistent joints under confining pressure with the bonded-particle model. The microscopic parameters which can reflect the macroscopic mechanical properties and failure behavior of artificial jointed specimens are firstly calibrated. Then, the influence of joint inclination and confining pressure on stress — strain curves, crack patterns, and contact force distributions of jointed rock are investigated. The simulation results show that both the compressive strength and elastic modulus of the specimens increase with increasing confining pressure, and these two mechanical parameters decrease first and then increase with the increase of joints inclination. The sensitivity of strength and elastic modulus to confining pressure is not the same in different joints inclinations, which has the least impact on specimens with α =90°. Under low confining pressure, the failure modes are controlled by the joint inclination. As the confining pressure increased, the initiation and propagation of tensile crack are gradually inhibited, and the failure mode is transferred from tensile failure to shear-compression failure. Finally, the reinforcement effect of prestressed bolt support on engineering fractured rock mass is discussed.

摘要

节理岩体的力学特性对于工程岩体的安全至关重要. 为了更好的掌握节理岩体的变形破坏规律, 采用离散元程序对不同围压作用下的断续节理岩体进行了模拟实验研究. 首先, 以室内试验数据为基础, 标定了能够反映节理试件宏观力学行为和变形破坏特征的数值模型细观参数. 然后, 研究了节理倾角和围压对节理试样应力应变曲线、破裂模式和接触力分布的影响规律. 结果表明; 试件的抗压强度和弹性模量随围压的增加而增加, 随节理组倾角的增加呈现出先减小后增大的变化趋势; 不同节理组倾角下试件的强度和弹性模量对围压的敏感性不同, 其中节理组倾角为90& deg; 时影响最小; 在低围压下, 试样的破坏模式由节理组倾角控制; 随着围压的增大, 拉裂缝的萌生和扩展逐渐受到抑制, 破坏模式由拉破坏向剪切-压缩破坏转变. 最后, 进一步探讨了预应力锚固支护对工程裂隙岩体的加固作用.

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Authors and Affiliations

  1. Key Laboratory of Mining Disaster Prevention and Control, School of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao, 266590, China

    Miao Chen  (陈淼), Chuan-wei Zang  (臧传伟), Guang-lei Zhou  (周广磊), Bang-you Jiang  (蒋邦友), Guang-chao Zhang  (张广超) & Cheng-peng Zhang  (张成朋)

  2. College of Energy Engineering, Xi’an University of Science and Technology, Xi’an, 710054, China

    Zi-wei Ding  (丁自伟)

  3. School of Resources and Safety Engineering, Chongqing University, Chongqing, 400044, China

    Cheng-peng Zhang  (张成朋)

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  1. Miao Chen  (陈淼)
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  2. Chuan-wei Zang  (臧传伟)
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  3. Zi-wei Ding  (丁自伟)
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  4. Guang-lei Zhou  (周广磊)
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  7. Cheng-peng Zhang  (张成朋)
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Corresponding authors

Correspondence to Miao Chen  (陈淼) or Chuan-wei Zang  (臧传伟).

Additional information

Foundation item

Projects(52004145, 51904164) supported by the National Natural Science Foundation of China; Project(ZR2020QE119) supported by the Natural Science Foundation of Shandong Province, China; Project(SICGM202107) supported by the Open Fund of the Key Laboratory of Mining Disaster Prevention and Control, China

Contributors

The overarching research goals were developed by CHEN Miao and ZANG Chuan-wei. CHEN Miao, DING Zi-wei and ZHOU Guang-lei analyzed the calculated results. The initial draft of the manuscript was written by CHEN Miao. JIANG Bang-you and ZHANG Guang-chao revised the initial draft. CHEN Miao and ZHANG Cheng-peng replied to reviewers’ comments and revised the final version.

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All the authors declare that they have no conflict of interest.

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Chen, M., Zang, Cw., Ding, Zw. et al. Effects of confining pressure on deformation failure behavior of jointed rock. J. Cent. South Univ. 29, 1305–1319 (2022). https://doi.org/10.1007/s11771-022-4991-z

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  • DOI: https://doi.org/10.1007/s11771-022-4991-z

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