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Mechanical behaviour analysis and support system field experiment of confined concrete arches

约束混凝土拱架力学性能分析及支护体系现场试验

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Abstract

Soft rock control is a big challenge in underground engineering. As for this problem, a high-strength support technique of confined concrete (CC) arches is proposed and studied in this paper. Based on full-scale mechanical test system of arch, research is made on the failure mechanism and mechanical properties of CC arch. Then, a mechanical calculation model of circular section is established for the arches with arbitrary section and unequal rigidity; a calculation formula is deduced for the internal force of the arch; an analysis is made on the influence of different factors on the internal force of the arch; and a calculation formula is got for the bearing capacity of CC arch through the strength criterion of bearing capacity. With numerical calculation and laboratory experiment, the ultimate bearing capacity and internal force distribution is analyzed for CC arches. The research results show that: 1) CC arch is 2.31 times higher in strength than the U-shaped steel arch and has better stability; 2) The key damage position of the arch is the two sides; 3) Theoretical analysis, numerical calculation and laboratory experiment have good consistency in the internal force distribution, bearing capacity, and deformation and failure modes of the arch. All of that verifies the correctness of the theoretical calculation. Based on the above results, a field experiment is carried out in Liangjia Mine. Compared with the U-shaped steel arch support, CC arch support is more effective in surrounding rock deformation control. The research results can provide a basis for the design of CC arch support in underground engineering.

摘要

针对典型软岩地下工程控制难题, 本文提出了约束混凝土高强支护技术。利用自主研发的全比 尺力学试验系统, 对于约束混凝土拱架的破坏机制及力学性能进行了研究。同时, 建立了圆形断面巷 道任意节数、非等刚度拱架力学计算模型, 推导了拱架内力计算公式, 分析了不同因素对拱架内力的 影响规律, 结合压弯强度判别准则, 得到了约束混凝土拱架承载能力计算公式。结合理论分析、数值 计算和室内试验对约束混凝土拱架的极限承载力及内力分布进行了对比分析, 研究结果表明: 1)约束 混凝土拱架比传统U型钢拱架强度提高2.31倍, 且具有更好的稳定性; 2)拱架关键破坏部位为两侧帮 部; 3)理论分析、数值计算以及室内试验在拱架的内力分布、承载能力和变形破坏形态等方面具有较 好的一致性, 验证了理论计算的正确性。在上述研究的基础上, 开展了梁家煤矿约束混凝土支护现场 试验, 与传统υ型钢拱架支护相比, 该类支护有效控制了围岩变形。研究成果可为地下工程约束混凝 土高强支护设计提供依据。

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Authors and Affiliations

  1. Research Center of Geotechnical and Structural Engineering, Shandong University, Ji’nan, 250061, China

    Qi Wang  (王琦), Ying-cheng Luan  (栾英成), Bei Jiang  (江贝), Shu-cai Li  (李术才) & Heng-chang Yu  (于恒昌)

  2. State Key Laboratory of Coal Resources and Safe Mining, China University of Mining & Technology, Xuzhou, 221116, China

    Qi Wang  (王琦)

  3. School of Civil Engineering and Architecture, University of Jinan, Ji’nan, 250022, China

    Bei Jiang  (江贝)

Authors
  1. Qi Wang  (王琦)
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  2. Ying-cheng Luan  (栾英成)
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  3. Bei Jiang  (江贝)
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  4. Shu-cai Li  (李术才)
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  5. Heng-chang Yu  (于恒昌)
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Correspondence to Bei Jiang  (江贝).

Additional information

Foundation item: Projects(51674154, 51704125, 51874188) supported by the National Natural Science Foundation of China; Projects(2017T100116, 2017T100491, 2016M590150, 2016M602144) supported by the China Postdoctoral Science Foundation; Projects(2017GGX30101, 2018GGX109001, ZR2017QeE013) supported by the Natural Science Foundation of Shandong Province, China; Project(SKLCRSM18KF012) supported by the State Key Laboratory of Coal Resources and Safe Mining, China; Project(2018WLJH76) supported by the Young Scholars Program of Shandong University, China

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Wang, Q., Luan, Yc., Jiang, B. et al. Mechanical behaviour analysis and support system field experiment of confined concrete arches. J. Cent. South Univ. 26, 970–983 (2019). https://doi.org/10.1007/s11771-019-4064-0

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  • DOI: https://doi.org/10.1007/s11771-019-4064-0

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