Numerical Simulation of Risk Nodes in Segment Floating Transportation of Honggu Tunnel in Nanchang

doi:10.3973/j.issn.1672-741X.2016.09.005

Tunnel Construction ›› 2016, Vol. 36 ›› Issue (9): 1052-1059.DOI: 10.3973/j.issn.1672-741X.2016.09.005

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Numerical Simulation of Risk Nodes in Segment Floating Transportation of Honggu Tunnel in Nanchang

DENG Xiaoxin¹, LIU Huikang^{2, *}, ZHANG Yucheng³, GUAN Lei⁴, HUANG Ke¹

（1. Nanchang Municipal Public Group, Nanchang 330000, Jiangxi, China;  2. Guangzhou Metro Design & Research Institute Co., Ltd., Guangzhou 510000, Guangdong, China;  3. Guangdong Research Institute of Water Resources and Hydropower, Guangzhou 510610, Guangdong, China;  4. China Railway Tunnel Group Co., Ltd., Luoyang 471009, Henan, China）

Received:2016-05-18 Revised:2016-08-15 Online:2016-09-20 Published:2016-09-20

Abstract

Abstract:

Honggu Tunnel is the first immersed tunnel in river with large flow velocity and large water level drop.The tunnel segment floating transportation is difficult. The risk nodes in segment floating transportation of the tunnel are analyzed so as to guarantee the safety of the segment and surrounding buildings. The water resistances on segment at every risk node are numerically simulated; the calculation software Fluent is adopted; and the calculation model is based on RNG κ-ε model.Some suggestions are proposed as follows: 1) The segment undocking should be carried out under the flow velocity of less than 0.6 m/s. 2) The segment turning should be carried out under the flow velocity of less than 08 m/s. 3) The segment passing through Nanchang Bridge should be carried out under the flow velocity of less than 1.0 m/s. 4) The optimized segment turning scheme of river course widening can meet the requirements of segment turning and anchoring.

Key words: Honggu Immersed Tunnel, tunnel segment floating transportation, water resistance, numerical simulation

CLC Number:

U 455.46

DENG Xiaoxin, LIU Huikang, ZHANG Yucheng, GUAN Lei, HUANG Ke. Numerical Simulation of Risk Nodes in Segment Floating Transportation of Honggu Tunnel in Nanchang[J]. Tunnel Construction, 2016, 36(9): 1052-1059.

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Numerical Simulation of Risk Nodes in Segment Floating Transportation of Honggu Tunnel in Nanchang

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