富水软弱土地区施工通常面临易扰动和承压水双重难题，南京河西地区便是典型富水软弱土地区代表，且近些年开发强度较大，同时地铁隧道沿线又是首选地段，通常面临基坑深、大、近等特点，确定可靠的地铁隧道保护措施是亟需研究的问题。文章以南京紫鑫中华广场三期为例，采用提高支护刚度、土体加固、设置隔离桩等保护措施减小基坑开挖对相邻隧道影响，同时通过MADIS软件分析相关保护措施的重要性和必要性，并结合地铁隧道监测数据加以验证，为在富水软弱土地层基坑施工对相邻地铁隧道的影响制定保护措施提供参考。

Construction in water-rich and soft soil areas usually faces dual problems of susceptible for disturbance and confined water. The Hexi area in Nanjing is a typical water-rich and soft soil area. In recent years, the development intensity has been relatively high and the area along the subway tunnel is the first choice for geotechnical engineering. However, this is often faced with the characteristics of deep, large and close foundation pits. Determining reliable subway tunnel protection measures has become an issue that needs urgent research. This article addeses this issue by taking the third phase of Nanjing Zixin Zhonghua Square as an example. Protection measures such as increasing support stiffness, soil reinforcement, and isolation piles are used to reduce the impacts of foundation pit excavation on adjacent tunnels. In the meantime, MADIS software is used to analyze the importance of relevant protection measures. The nature and necessity are verified by combining with the subway tunnel monitoring data to provide a reference for formulating protective measures for the impacts of foundation pit construction in water-rich and soft soil layers on adjacent subway tunnels.