Effect on Construction Intervals on Deformation Characteristics of Surface Soil during Construction of Twintube Shieldbored Tunnels: Case Study on a Running Tunnel of Line 6 of Tianjin Metro

doi:10.3973/j.issn.1672-741X.2015.10.003

Tunnel Construction ›› 2015, Vol. 35 ›› Issue (10): 989-996.DOI: 10.3973/j.issn.1672-741X.2015.10.003

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Effect on Construction Intervals on Deformation Characteristics of Surface Soil during Construction of Twintube Shieldbored Tunnels: Case Study on a Running Tunnel of Line 6 of Tianjin Metro

ZHANG Sherong^1,2, YU Mao^1,2, DU Xiaoyu^1,2, LOU Yu³

(1. State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300072, China; 2. School of Civil Engineering, Tianjin University, Tianjin 300072, China; 3. China Railway 16th Bureau Group Co., Ltd, Tianjin 300162, China)

Received:2015-05-11 Revised:2015-08-19 Online:2015-10-20 Published:2015-11-09

Abstract

Abstract:

Studying the mechanism of the ground surface deformation under different construction intervals of twintube tunnels has great importance for the control of the overall deformation and the differential deformation of the ground surface. In the paper, the distribution characteristics of the surface soil deformation under different construction intervals are studied, with a twintube running tunnel on Line 6 of Tianjin Metro crossing underneath Tianjin West Railway Station as an example. In the study, the key deformation control indices of the railway facilities are adopted as the evaluation standard. The relationship between the ground surface settlement/differential settlement and the construction intervals are analyzed, providing reliable basis for choosing suitable construction intervals so as to ensure the engineering safety and the smooth operation of the railway facilities. The results reveal that the construction intervals have obvious impact on the disturbance degrees and disturbance ranges of the ground surface deformation during the tunnel construction. As for the ground surface settlement, the smaller the construction intervals are, the faster the surface settlement at the tunnel face is. The range of the longitudinal deformation of the surface soil is about 20m when the left tube is completely in advance, about 25 m smaller than that in simultaneous construction. As for the differential settlement of the surface soil, when the left tube is completely in advance, the maximum values of the surface deformations in the track direction, horizontal direction and track spacing are 1mm, 0.6mm and 0.2mm respectively, about 0.8mm, 0.2mm and 0.15mm smaller than those in simultaneous construction respectively. Thus, the simultaneous construction of the twin tunnel tubes is the most adverse condition in terms of controlling the surface soil deformation, while accomplishing the excavation of one tube before the construction of the other is the best way to control the surface soil deformation.

Key words: Tianjin Metro, shieldbored tunnel, twintube tunnel, construction interval, ground surface deformation characteristics, numerical simulation

CLC Number:

U 459.3

ZHANG Sherong, YU Mao, DU Xiaoyu, LOU Yu. Effect on Construction Intervals on Deformation Characteristics of Surface Soil during Construction of Twintube Shieldbored Tunnels: Case Study on a Running Tunnel of Line 6 of Tianjin Metro[J]. Tunnel Construction, 2015, 35(10): 989-996.

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Effect on Construction Intervals on Deformation Characteristics of Surface Soil during Construction of Twintube Shieldbored Tunnels: Case Study on a Running Tunnel of Line 6 of Tianjin Metro

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