Feasibility Analysis on Key Technologies to Cope with High Water Pressure and Long Distance of Subsea Shield Tunnel

SONG Chaoye1 HE Weiguo1 WU Yijun2

(1.China Railway Liuyuan Group Co., Ltd., Tianjin 300133)
(2.Enterprise Key Laboratory of Tunnel Design and Safety Assessment, Tianjin 300133)

【Abstract】The sea-crossing tunnels are developing rapidly in China. The proposed Qiongzhou Strait Passage and Bohai Strait Passage will face technical difficulties such as ultra-long distance and ultra-high water pressure tunneling. In the current research and practice, the water pressure of shield tunneling is about 0.8 MPa, and the distance of one tunneling is within 8 km. Based on the engineering background of the Qiongzhou Strait Middle Line Shield Tunnel(water pressure of 1.2 MPa, tunneling length of 12 km), the engineering analogy and construction key technologies are used to analyze the feasibility of high-pressure long-distance shield tunneling technology to solve the problem of safe tunneling and safe service during the operation of the shield tunnel under high water pressure. The following technologies, i. e., shield active tool change, passive saturation diving belt pressure tool change, integrated tool change technology for freezing and strengthening in extraordinary state and the comprehensive technology of replaceable seal, are put forward, which can guarantee the shield tunneling for long distance. Meanwhile, an ultra-high water pressure shield composite segment lining and a combination of internal and external waterproof structures are proposed to ensure the safe operation of the shield segment structure under ultra-high water pressure.

【Keywords】 subsea tunnel; high water pressure; shield tunnel; long distance tunneling; cutting tool replacement;

【DOI】

【Funds】 Research Plan of National Railway Administration of the People's Republic of China (KF2015-005-B) Project of Science and Technology Research and Development Program of China Railway Corporation (2016-Major-08)

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This Article

ISSN:2096-4498

CN: 44-1745/U

Vol 40, No. 05, Pages 717-726

May 2020

Downloads:9

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Article Outline

Abstract

  • 0 Introduction
  • 1 Qiongzhou Strait Railway Tunnel
  • 2 Case study on shield tunnels under highwater pressure
  • 3 Countermeasures for construction of shield-bored tunnels under high waterpressure
  • 4 Segment structure to cope with high waterpressure
  • 5 Conclusions and recommendations
  • References