ISSN 2096-4498

   CN 44-1745/U

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Tunnel Construction >

2023 , Vol. 43 >Issue 4: 690 - 697

DOI: https://doi.org/10.3973/j.issn.2096-4498.2023.04.015

Stability Analysis of Surrounding Rock of Inverse Bench Excavation of Metro Tunnel with Minimal Overburden Thickness

  • WANG Jianhui ,
  • GAO Meng ,
  • WANG Runsheng ,
  • YANG Kai ,
  • HUANG Changxin ,
  • ZHANG Lianzhen ,
  • ZHANG Qing ,
  • ZHAO Yao ,
  • HAN Xu ,
  • ZHAO Junyun ,
  • WANG Anni ,
  • LI Zhipeng ,
  • WENG Xianjie
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  • (1.The 5th Engineering Co.,Ltd.of China Railway 19th Bureau Group,Dalian 116600,Liaoning,China;2.College of Pipeline and Civil Engineering,China University of Petroleum,Qingdao 266580, Shandong, China;3.School of Civil Engineering,Shandong University, Jinan 250061,Shandong,China;4.Kunming Railway Construction Company of China Railway No.8 Engineering Group Ltd.,Kunming 650000,Yunnan,China;5.School of Transportation and Civil Engineering,Shandong Jiaotong University,Jinan 250357,Shandong,China;6.Jiangxi Transport Consultation Company,Nanchang 330008,Jiangxi,China)

Online published: 2023-05-23

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Abstract

Blasting disturbance for tunnels excavated using bench method greatly influences the stability of the overlying surrounding rocks. This may result in tunnel collapse in the case of minimal overburden thickness. Thus, to address the above problem, an inverse bench excavation method, i.e., the lower bench goes first and then the top heading is excavated by blasting control technique, is proposed. The stability of surrounding rocks excavated by inverse bench method is numerically simulated using a case study of a metro tunnel excavation in Qingdao by applying the FLAC 3D finite element analysis software. The simulation results and engineering practice show that, under minimal overburden thickness, the inverse bench excavation can provide extra excavation free face for the top heading. This effectively reduces the blasting disturbance to the mechanical properties and integrity of the surrounding rocks, protecting their bearing capacity and guaranteeing the excavation safety of the metro tunnel.

Key words： tunnel engineering; blasting disturbance; minimal overburden thickness; reverse bench method; numerical simulation; excavation stability

Cite this article

WANG Jianhui , GAO Meng , WANG Runsheng , YANG Kai , HUANG Changxin , ZHANG Lianzhen , ZHANG Qing , ZHAO Yao , HAN Xu , ZHAO Junyun , WANG Anni , LI Zhipeng , WENG Xianjie . Stability Analysis of Surrounding Rock of Inverse Bench Excavation of Metro Tunnel with Minimal Overburden Thickness[J]. Tunnel Construction, 2023 , 43(4) : 690 -697 . DOI: 10.3973/j.issn.2096-4498.2023.04.015

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