Construction Technology of LargeDiameter
Shield Launching underneath Pipeline Group in SandyCobble Strata: a Case Study of Shield Tunnel of 〖JP3〗Wenquan Avnue StationMingguang Station Section on Chengdu Metro Line 17

WANG Deyong; ZHAO Dongping; AI Xiaoyang; WANG Luwei

doi:10.3973/j.issn.2096-4498.2020.S2.033

2020 , Vol. 40 >Issue S2: 256 - 263

DOI: https://doi.org/10.3973/j.issn.2096-4498.2020.S2.033

Construction Technology of LargeDiameter Shield Launching underneath Pipeline Group in SandyCobble Strata: a Case Study of Shield Tunnel of 〖JP3〗Wenquan Avnue StationMingguang Station Section on Chengdu Metro Line 17

WANG Deyong ,
ZHAO Dongping ,
AI Xiaoyang ,
WANG Luwei

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(1. Southwest Engineering Co., Ltd. of CCCC First Highway Engineering Co., Ltd., Chengdu 610091, Sichuan, China; 2. Key Laboratory of Transportation Tunnel Engineering, Ministry of Education, Southwest Jiaotong University, Chengdu 610031, Sichuan, China; 3. School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, Sichuan, China)

Online published: 2021-03-22

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Abstract

The settlement control is of great significance in largediameter shield launching underneath highpressure gas pipeline group in sandycobble strata. Hence, researches are conducted on reinforcement scheme, construction technology and parameters control of a largediameter shield launching underneath pipeline group at Wenquan Avnue stationMingguang station section on Chengdu metro line 17 using program demonstration and onsite measurement methods. The results show the following. (1) The surface settlement induced by the shield launching in sandycobble strata can be effectively controlled using combination scheme of doublelayer large pipe roof, Soletanche grouting and well point dewatering. (2) The settlement of pipeline in sandycobble strata can be effectively controlled by adopting the protection measures of strip foundation reinforcement and steel wire suspension fixation. (3) The recommended twostage control parameters for shield launching underneath pipeline in sandycobble strata are proposed based on the excavation test of shield tunnel in the same geological conditions and buried depth. (4) The pipeline settlement monitoring data show that the cumulative settlement of the pipeline during shield tunneling is within the control standard.

Key words： sandycobble stratum; shield tunnel; launching underneath pipeline group; tunneling parameters

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WANG Deyong , ZHAO Dongping , AI Xiaoyang , WANG Luwei . Construction Technology of LargeDiameter Shield Launching underneath Pipeline Group in SandyCobble Strata: a Case Study of Shield Tunnel of 〖JP3〗Wenquan Avnue StationMingguang Station Section on Chengdu Metro Line 17[J]. Tunnel Construction, 2020 , 40(S2) : 256 -263 . DOI: 10.3973/j.issn.2096-4498.2020.S2.033

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