Synchronous Backfilling Technology for Gravel and
Bottom Grouting Behind&nbsp;Double-Shield Tunnel Boring Machine
Segment: A Case Study of a


	

Section
of Qingdao Metro Line 6

WANG Shouhui; YANG Xing; JIANG Yusheng; LIU Quanwei; ZHAO Jizeng; ZHU Zhijing; SHAO Changzhi; TAN Zhuolin; YANG Zhiyong

doi:10.3973/j.issn.2096-4498.2023.11.015

2023 , Vol. 43 >Issue 11: 1954 - 1963

DOI: https://doi.org/10.3973/j.issn.2096-4498.2023.11.015

Synchronous Backfilling Technology for Gravel and Bottom Grouting Behind Double-Shield Tunnel Boring Machine Segment: A Case Study of a

Section of Qingdao Metro Line 6

WANG Shouhui ,
YANG Xing ,
JIANG Yusheng ,
LIU Quanwei ,
ZHAO Jizeng ,
ZHU Zhijing ,
SHAO Changzhi ,
TAN Zhuolin ,
YANG Zhiyong

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(1.Qingdao Metro Group Co.,Ltd.,Qingdao 266045,Shandong,China;2.School of Mechanics and Civil Engineering,China University of Mining and Technology Beijing,Beijing 100083,China;3.Qingdao Metro Line 6 Co.,Ltd.,Qingdao 266427,Shandong,China;4.School of Civil Engineering,Shandong University,Jinan 250002,Shandong,China;5.China Railway No.2 Engineering Group Co.,Ltd.,Chengdu 610031,Sichuan,China)

Online published: 2023-12-08

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Abstract

To address challenges related to untimely gravel backfilling, suboptimal backfilling effects, and delayed grouting behind the doubleshield tunnel boring machine(TBM) segment, a novel TBM shield tail sealing plate that is characterized by high wearresistance, easy assembly, elevated elasticity, and effective sealing is proposed. This design considers the structural mode of the TBM shield tail and its positional relationship with surrounding rocks and segments, facilitating synchronous backfilling of gravel and bottom grouting. To validate the feasibility of this technology, a field test is conducted on a section of Qingdao metro line 6. Primary indices, such as grout mixing ratio, grouting amount, and positions are collected. The results highlight the following key findings: (1) The installation of the sealing plate ensures the advance backfilling of gravel, thereby creating favorable conditions for synchronous bottom grouting. (2) A slurry with a watercement ratio of 2.3∶5 and a consistency of less than 13 cm is sufficient to meet the gravel grouting requirements. (3) For the lower segment, it is recommended that grouting points be positioned at a 60° angle against the 〖WT〗Y〖WT５《TNR》〗line of the tunnel crosssection to prevent grout overflow.

Key words： metro; doubleshield tunnel boring machine; segment; gravel; grouting; synchronous backfill

Cite this article

WANG Shouhui , YANG Xing , JIANG Yusheng , LIU Quanwei , ZHAO Jizeng , ZHU Zhijing , SHAO Changzhi , TAN Zhuolin , YANG Zhiyong .

Synchronous Backfilling Technology for Gravel and Bottom Grouting Behind Double-Shield Tunnel Boring Machine Segment: A Case Study of a

Section of Qingdao Metro Line 6

[J]. Tunnel Construction, 2023 , 43(11) : 1954 -1963 . DOI: 10.3973/j.issn.2096-4498.2023.11.015

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