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Based on the design practice of the interchange between Shenzhen-Zhongshan Link and the airport — the first large underground interchange in the sea in China, the paper investigates the key design technologies in view of the project characteristics, such as the interchange hub selection, bridge and tunnel conversion, construction operation, operation guarantee, complex hydrogeology and surrounding constraints. The results show that: 1) A large underground interchange in the sea is adopted to effectively solve the traffic conversion demand of airport hub under complex conditions. 2) The scheme of a "one body with two wings" artificial island and double-row steel sheet pile short cofferdam is adopted, which effectively solve the conversion of large underground interchange with the tube tunnel, construction on land and the operational support needs. 3)A supporting structure of impact-cone cast-in-place pile + pilot-hole with clay replacement and high-pressure jet grouted pile is adopted, which effectively solve the construction of foundation pit in complex marine silt with riprapped rock and sand fill and water-stopping problem. 4) A locking steel pipe pile integrated enclosure scheme is adopted, which provides effective protection for the highway bridge piers during the construction of the artificial island and the excavation of the foundation pit. 5)A double exhaust shaft scheme is adopted, which effectively solve the problem of building of longitudinal through exhaust ducts in ramp tunnels in complex marine environment. [ABSTRACT FROM AUTHOR]

Based on the comprehensive comparison and analysis of the methods for laying out and the application effect of the construction survey control network for the construction of the artificial islands and tunnels for the Hongkong-Zhuhai-Macao Bridge and the Shenzhen-Zhong shan Link, this paper summarizes the common characteristics of the construction survey for the cross-sea artificial islands and tunnels, and proposes reasonable suggestions on the design of the survey networks, site selection and embedment of survey points, evaluation of the stability of control points and application of survey results, which can be used for reference on similar projects. [ABSTRACT FROM AUTHOR]

The west artificial island of Shenzhen-Zhongshan Link adopts the rapid island-formation process by inserting large diameter steel cylinders into the enclosed island body on the sea bed. At present, the cases of rapid island-formation by steel cylinder are relatively few, and the research on the tilt of steel cylinder during construction and the stability of the cylinder need to be further deepened. Taking the west artificial island of Shenzhen-Zhongshan Link as an example, in view of the construction conditions of steel cylinder vibration and sinking until the formation of land area of artificial island, this paper analyzed the causes of the tilt of the cylinder under the comprehensive action of loads inside and outside the island, the results are closely related to the geological conditions and the lateral pressure and water pressure caused by the foundation reinforcement inside and outside the cylinder during construction. The monitoring results after foundation treatment in the island and the riprap of the island wall structure are basically completed show that the cylinder displacement and tilt have converged, and the security has been controlled. It provides some experience reference for further research on the stability of steel cylinder enclosure structure during construction in similar projects. [ABSTRACT FROM AUTHOR]

In order to realize data fusion calculation in the flexible elevation transference and meet the data monitoring requirements of leveling construction, a decision support system for leveling construction of Shenzhen -Zhongshan Link immersed tube storage area was developed. In this paper, measurement and control solution method for leveling construction was introduced, the structure of decision support system and the main function modules including general navigation & positioning, leveling parameter design and positioning, leveling construction monitoring and leveling data management were analyzed, and an application example in the leveling construction of immersed tube storage area was also given. Application results show that the technical route of the measurement and control method is reasonable, the calculation method of the software is efficient and correct, multi-perspective data display mode can vividly display the relative relationship between real time monitoring elevation and design elevation, which meets the application requirements of leveling construction. [ABSTRACT FROM AUTHOR]

The engineering control and survey technology of Shenzhen-Zhongshan Link is different from the general engineering survey technology. It is far away from the coast, large-scale survey control network, high precision requirements, many participating units, and the implementation of the retest organization is difficult. In this paper, we briefly introduced the planning and implementation of the first class survey control network retest technology of Shenzhen-Zhongshan Link island and tunnel project, summarized the experience and lessons, which can provide references for similar projects. [ABSTRACT FROM AUTHOR]