Failure Mechanism and Support Technology of
Surrounding Rocks in Lithologic&nbsp;Interface
Area of DeepBuried Tunnel Bored by Tunnel Boring Machine

YAO Zhibin; XIONG Yongrun; FU Lianjie; QUAN Yongwei; NIU Wenjing; HU Lei

doi:10.3973/j.issn.2096-4498.2023.01.011

2023 , Vol. 43 >Issue 1: 102 - 111

DOI: https://doi.org/10.3973/j.issn.2096-4498.2023.01.011

Failure Mechanism and Support Technology of Surrounding Rocks in Lithologic Interface Area of DeepBuried Tunnel Bored by Tunnel Boring Machine

YAO Zhibin ,
XIONG Yongrun ,
FU Lianjie ,
QUAN Yongwei ,
NIU Wenjing ,
HU Lei

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(1.Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines,Northeastern University,Shenyang 110819, Liaoning,China;2.Key Laboratory of Liaoning Province on Deep Engineering and Intelligent Technology,Northeastern University, Shenyang 110819,Liaoning,China;3.Xinjiang Erqisi River Basin Development and Construction Administration,Urumqi 830000,Xinjiang,China)

Online published: 2023-02-16

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Abstract

To ensure safe and efficient construction in the lithologic interface area of deepburied tunnels bored by tunnel boring machines, field investigations and microseismic surveys are comprehensively employed to study the characteristics of surrounding rock damage and microseismicity in the axial lithologic interface area. On this basis, the support technologies for the surrounding rock damage in the lithologic interface area are examined. The results are as follows: (1) Owing to the stress concentration in the lithologic interface area, the surrounding rocks are prone to damage after excavation and unloading. The characteristics of "hard" on the south and "soft" on the north of the surrounding rocks cause different types of damage, distributed on both sides of the tunnel with the alteration zone as the boundary, and the damage distribution has obvious regionality. (2) There are good spatial correlations among rockburst, collapse, and microseismicity. (3) When the rockburst grade is low, the structural collapse should be preliminarily considered when employing a support method. As the rockburst grade rises, the rockburst should be gradually considered in the support method.

Key words： tunnel bored by tunnel boring machine; rockburst; collapse; lithologic interface; failure mechanism; support method[

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YAO Zhibin , XIONG Yongrun , FU Lianjie , QUAN Yongwei , NIU Wenjing , HU Lei .

Failure Mechanism and Support Technology of Surrounding Rocks in Lithologic Interface Area of DeepBuried Tunnel Bored by Tunnel Boring Machine

[J]. Tunnel Construction, 2023 , 43(1) : 102 -111 . DOI: 10.3973/j.issn.2096-4498.2023.01.011

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