General Introduction
Presidents and Academicians
Dam Safety Management Center of MWR
Waterlocks Safety Management Center of MWR
Research Center for Climate Change of MWR
Engineering Quality Inspection Center of MWR
Hydrology and Water Resources Department
Hydraulic Engineering Department
River and Harbor Engineering Department
Geotechnical Engineering Department
Materials and Structural Engineering Department
Dam Safety Management Department
Center of Eco-Environmental Research
Research Center for Rural Water Management
State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering
Key Laboratory of Port, Waterway and Sedimentation Engineering of Ministry of Transport
Key Laboratory of Water Science and Hydraulic Engineering of MWR
Key Laboratory of Failure Mechanism and Safety Control Techniques of Earth-rock Dam of MWR
R&D Center of Hydro-Power Engineering Safety and Environmental Technology of NEA
International Joint Research Center of Water Science & Engineering
Research Center on Hydrology and Water Resources Engineering of MWR
Tiexinqiao Water Experiment Center
Chuzhou Water Experiment Center
Dangtu Water Experiment Center
River and Lake Research Center at Wuxi
NHRI Patented Detection Technique Facilitates the Accurate Butt Joint of the First Tube of Immersed Tunnel of the Shenzhen-Zhongshan Link
Post Time:2020-07-13Front:[ Large Medium Small ]

On June 17, 2020, the first tube of immersed tunnel of the Shenzhen-Zhongshan Link successfully achieved the accurate butt joint with the buried section of the west artificial island after about 33 hours, indicating that the core control project in the key route of the Link has made significant progress and further marking that China has reached a new technological peak in the field of immersed tunnel construction. The Shenzhen-Zhongshan Link Management Center sent a congratulatory letter to NHRI.

The Shenzhen-Zhongshan Link is a major national project in the 13th Five-Year Plan and an important river-crossing channel in the Guangdong-Hong Kong-Macao Greater Bay Area, with a total length of about 24 km, of which the immersed tunnel is about 6.8 km long and is divided into 32 sections of immersed tubes. The immersed tubes adopt the world's first two-way eight-lane steel-shell concrete structure. The submarine immersed tunnel is the longest and widest steel-shell concrete tunnel in the world, without any relevant engineering experience in the entire industry chain to be referred at present. Reliable non-destructive testing technique of immersed tube tunnel with steel-shell concrete structure is one of the controlling links to control the pouring quality of self-compacting concrete and ensure the safety of the Link immersed tubes.


In order to solve this world-class problem of the complex structure of the Link immersed tubes, NHRI proposed a quantitative detection method of the void height of steel-shell concrete and developed the non-destructive testing equipment for millimeter-level void of steel-shell concrete after more than three years of technical research and more than 10,000 indoor model tests, with the help of its existing exclusive patented technique. By more than a thousand groups of voiding blind detection verification with the full-scale model in the early stage of the Link, the detection resolution was up to 2 mm, and the coincidence rate over 85%, which surpassed Japan's 70% detection level. It has been successfully applied to the quality inspection of the first section of the Link immersed tubes.

As early as 2010-2012 during the feasibility study of the Shenzhen-Zhongshan Link, the Institute carried out a special study on the impact of the engineering construction on the water-sediment environment and the port channel of the Lingding Sea. Using seabed evolution analysis, large-scale movable-bed physical model tests and mathematical model simulation, under the emergency of large-scale sand mining pits in the Lingding Sea, NHRI demonstrated the adaptability of the project scheme to adopt the combination of the west bridge and the east tunnel from the perspective of meeting the navigation conditions and maintaining the swale stability. During this period, the Institute also completed the calculation of the hydrological elements like the design wave and water level of the artificial island in the bridge area, and the feasibility study on the upgrade of the special channel of the offshore platform and the Fanshi Channel to the 100,000-ton channel, which has laid an important foundation for the final Link scheme.


Physical Model Test


In the preliminary design stage of the Shenzhen-Zhongshan Link from 2016 to 2017, the research team of NHRI carried out a special study on the observation and test of the back silting of the foundation trench of the Link immersed tunnel. According to the backfilling monitoring of the trial trench, the analysis of the water-sediment environment in the water area of the foundation trench, and the simulation results of the tide-current-sediment mathematical model, the backfilling intensity and distribution characteristics of the ultra-long foundation trench after excavation were predicted, providing a basis for formulating the construction plan for immersed tubes placement. Since the construction of the main works of the artificial islands and tunnel started in December 2017, the Institute has continued to invest excellent resources in the special research on technical problems encountered in the construction process. It successively carried out numerical model studies on the design hydrology and wave, and tide, current and sediment for the area ranging from the Longxue Harbour basin to the Link tunnel site during the construction period, and at the same time conducted a special study on the erosion and protection of the east anchorage of the super-large bridge across the Lingding Channel. The work at this stage has provided technical support for the prefabrication, transportation and precise butt joint of large steel-shell concrete immersed tubes of the Link.


3D Mathematical Model Simulation


With the simultaneous construction of the two pouring sections of the Link immersed tunnel, NHRI will, as always, work hard, uphold science and standards, strive for excellence, and contribute wisdom and strength to build the Link as a "100-year safe quality project" and accelerate the strategy of "a country with strong transportation network".

打印本页 关闭窗口
Produced By 大汉网络 大汉版通发布系统