The East Artificial Island of the Shenzhen-Zhongshan Link serves as the foundation for the large interchange between the tunnel and the Guangzhou-Shenzhen coastal expressway bridge,and it is located directly beneath the existing coastal expressway.A total of 41 piers of the expressway are situated within the island and are affected by the construction of the artificial island filling.To ensure the normal operation of the coastal expressway,both the horizontal and vertical displacement control values at the pier tops must be maintained within 5 mm during construction and after the completion of the artificial island.In response to the challenges of bridge deformation control during the construction of the artificial island,key measures such as strengthening the foundation of the island-wall structure,setting up isolation protection piles for piers,backfilling in sections with proper foundation treatment,and reasonably controlling the backfill height difference are adopted in the design scheme of the artificial island.The geotechnical finite element analysis software midas GTS NX-2017 is used to analyze the influence of the island filling process and island wall structure construction of the artificial island on the deformation of the abutments.Real-time monitoring of bridge settlement and displacement is conducted to guide the construction process.These measures successfully facilitated the formation of the East Artificial Island under the coastal expressway bridge,ensuring the smooth completion of the Shenzhen-Zhongshan Link and the normal operation of the coastal expressway,which provides reference significance for other engineering constructions.