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Evaluation of Excavation-Damaged Zone around Underground Tunnels by Theoretical Calculation and Field Test Methods

Author

Listed:
  • Ming Tao

    (School of Resources and Safety Engineering, Central South University, Changsha 410083, China)

  • Zhixian Hong

    (School of Resources and Safety Engineering, Central South University, Changsha 410083, China)

  • Kang Peng

    (College of Resources and Environmental Science, Chongqing University, Chongqing 400044, China)

  • Pengwei Sun

    (Fankou Lead-zinc Mine, Shenzhen Zhongjin Lingnan Nonfemet Company Limited, Shaoguan 512325, China)

  • Mingyu Cao

    (Fankou Lead-zinc Mine, Shenzhen Zhongjin Lingnan Nonfemet Company Limited, Shaoguan 512325, China)

  • Kun Du

    (School of Resources and Safety Engineering, Central South University, Changsha 410083, China
    Advanced Research Center, Central South University, Changsha 410083, China)

Abstract

Excavation-damaged zones (EDZs) induced in underground mining and civil engineering potentially threaten tunnel safety and stability, and increase construction and support costs. In this paper, an investigation of the excavation damaged zone (EDZ) around roadways in Fankou lead-zinc mine in Guangzhou, China is performed by applying a seismic velocity method accompanied by SET-PLT-01 nonmetallic ultrasonic detector. Meanwhile, the in situ stress in the mining area was measured based on the stress relief method with the Swedish high-precision LUT system. The results indicate that the stress field is dominated by the maximum horizontal tectonic stress, and the extents of the EDZ on the roof-floor region are greater than that on the sidewall. In addition, both of the in situ stresses and EDZs show an increasing trend with an increase of depth. Analytical solutions of EDZ around circular openings in the brittle rock mass subjected to non-hydrostatic stress fields are presented in terms of the Mohr–Coulomb and generalized Hoek–Brown criteria, and validated by several cases mentioned above. The extents of EDZ solved by closed-form solutions were found to be in a great agreement with those obtained in the field. Finally, a series of parametric studies are conducted to investigate the effects of cohesion ( c ), friction angle ( φ ), geological strength index ( GSI ), m i , uniaxial compressive strength ( σ c ), and disturbance factor ( D ) on EDZ. It is shown that the effects of c , φ , GSI , and σ c are significant; however, more attention should be paid to consider the dynamic disturbances induced by mechanical drilling, blasting, and seismic waves in tunnel excavations or operations.

Suggested Citation

  • Ming Tao & Zhixian Hong & Kang Peng & Pengwei Sun & Mingyu Cao & Kun Du, 2019. "Evaluation of Excavation-Damaged Zone around Underground Tunnels by Theoretical Calculation and Field Test Methods," Energies, MDPI, vol. 12(9), pages 1-18, May.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:9:p:1682-:d:228111
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    References listed on IDEAS

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    1. Ji Tae Kim & Ki-Bae Hong & Hong Sun Ryou, 2018. "Numerical Analysis on the Effect of the Tunnel Slope on the Plug-Holing Phenomena," Energies, MDPI, vol. 12(1), pages 1-8, December.
    2. Xiaowei Feng & Nong Zhang & Lianyuan Gong & Fei Xue & Xigui Zheng, 2015. "Application of a Backfilling Method in Coal Mining to Realise an Ecologically Sensitive “Black Gold” Industry," Energies, MDPI, vol. 8(5), pages 1-12, April.
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    Cited by:

    1. Marek Jendryś & Stanisław Duży & Grzegorz Dyduch, 2020. "Analysis of Stress-Strain States in the Vicinity of Mining Excavations in a Rock Mass with Variable Mechanical Properties," Energies, MDPI, vol. 13(21), pages 1-15, October.
    2. Jianyu Li & Hong Li & Zheming Zhu & Ye Tao & Chun’an Tang, 2021. "Numerical Study on Damage Zones Induced by Excavation and Ventilation in a High-Temperature Tunnel at Depth," Energies, MDPI, vol. 14(16), pages 1-20, August.
    3. Kang Yi & Zhenghe Liu & Zhiguo Lu & Junwen Zhang & Shuangyong Dong, 2020. "Effect of Axial In-Situ Stress in Deep Tunnel Analysis Considering Strain Softening and Dilatancy," Energies, MDPI, vol. 13(6), pages 1-14, March.

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