Key Techniques of Excavation and Blasting in ShallowBuried
Soft and Hard&nbsp;Strata
of Tunnel Boring Machine Preparatory Tunnel of Plateau Railway

LI Zhijun; LIU Guangzhi; YU Jingbo; CHEN Qiao

doi:10.3973/j.issn.2096-4498.2022.06.012

2022 , Vol. 42 >Issue 6: 1044 - 1052

DOI: https://doi.org/10.3973/j.issn.2096-4498.2022.06.012

Key Techniques of Excavation and Blasting in ShallowBuried Soft and Hard Strata of Tunnel Boring Machine Preparatory Tunnel of Plateau Railway

LI Zhijun ,
LIU Guangzhi ,
YU Jingbo ,
CHEN Qiao

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(1. School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, Sichuan, China; 2. China Railway Tunnel Group Co., Ltd., Guangzhou 511458, Guangdong, China)

Online published: 2022-07-05

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Abstract

Two open tunnel boring machines bored the left and right line preparatory tunnels of a tunnel of the advanced bid doubletunnel and onebridge project. During the drillandblast construction, waterrich Grades Ⅳ, Ⅴ, and Ⅵ surrounding rocks with soft and hard soils were encountered. As a result, the principle technology varies with lithology, active treatment, and vibration reduction is adopted. Furthermore, techniques such as bench change and automatic blasting, threebench reserved core soil and annular pilot tunnel loose blasting, cutting before blasting and edge cutting by hydraulic top heading milling excavation and lower bench loose blasting, top heading hydraulic hammer excavation and edge cutting by scarifier, and arch foot weak blasting are employed, resulting in successful completion of preparatory tunnels.

Key words： plateau railway tunnel; preparatory tunnel; vibration reduction; smooth blasting; reserved core soil

Cite this article

LI Zhijun , LIU Guangzhi , YU Jingbo , CHEN Qiao .

Key Techniques of Excavation and Blasting in ShallowBuried Soft and Hard Strata of Tunnel Boring Machine Preparatory Tunnel of Plateau Railway

[J]. Tunnel Construction, 2022 , 42(6) : 1044 -1052 . DOI: 10.3973/j.issn.2096-4498.2022.06.012

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