ANALYSIS ON EVOLUTION LAWS AND CAUSES OF STRUCTURE PERFORMANCES FOR COASTAL IMMERSED TUNNELS IN SOFT SOIL

XIE Xiongyao; ZHANG Naiyuan; ZHOU Biao; WANG Xiaojia

doi:10.13204/j.gyjzG20102911

Volume 51 Issue 7

Nov. 2021

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XIE Xiongyao, ZHANG Naiyuan, ZHOU Biao, WANG Xiaojia. ANALYSIS ON EVOLUTION LAWS AND CAUSES OF STRUCTURE PERFORMANCES FOR COASTAL IMMERSED TUNNELS IN SOFT SOIL[J]. INDUSTRIAL CONSTRUCTION, 2021, 51(7): 1-5,24. doi: 10.13204/j.gyjzG20102911

Citation:

XIE Xiongyao, ZHANG Naiyuan, ZHOU Biao, WANG Xiaojia. ANALYSIS ON EVOLUTION LAWS AND CAUSES OF STRUCTURE PERFORMANCES FOR COASTAL IMMERSED TUNNELS IN SOFT SOIL[J]. INDUSTRIAL CONSTRUCTION, 2021, 51(7): 1-5,24. doi: 10.13204/j.gyjzG20102911

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ANALYSIS ON EVOLUTION LAWS AND CAUSES OF STRUCTURE PERFORMANCES FOR COASTAL IMMERSED TUNNELS IN SOFT SOIL

doi: 10.13204/j.gyjzG20102911

1. College of Civil Engineering, Tongji University, Shanghai 200092, China;
2. Shanghai Municipal Highway Engineering Testing Co., Ltd., Shanghai 200031, China

Received Date: 2020-10-29
Available Online: 2021-11-11

Abstract

Abstract

In view of the urgent need of dependably technical supports and guidance in safety appraisals and further maintenance decisions for immersed tunnels in operation in China, to explore the long-term evolution laws and causes of structural performances for immersed tunnels, an analysis comparison was conducted on investigated data from Waihuan Tunnel in Shanghai involving long-term subsidence, water pressure in gaskets between segment joints,cracks in segments,quantities of water seepage and bare rebars,and thickness of overlaying soil,the main distribution characteristics of damage, evolution laws of structural properties, and causes of common damage were revealed. The results showed that subsidence was significant uneven along Waihuan Tunnel in Shanghai, in which the subsidence in some sections was not steady yet. Water pressure was measured in gaskets between segment joints of being damaged in waterproof, the seasonal variations of water pressure by temperature reflected the expansion and contraction of segment joints. A main chain of the performance deterioration for Waihuan Tunnel in Shanghai was revealed, that was the poor foundation and heavier loads from overlaying soil caused the uneven subsidence and then led to a series of quality issues that were the deformation of the structure, the evolution of cracks, the water seepage, the exposure and corrosion of rebars in series.
- immersed tunnel,
- performance evolution,
- structural damage,
- uneven subsidence

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References(18)

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