基坑围护结构是基坑安全稳定的最基本保障，杭州解放路延伸线新城隧道基坑开挖深度大、地下水位高、地质差，围护结构施工难度大。结合工程实际，分析介绍了基坑施工过程中围护结构的施工技术及辅助性措施。

Retaining structure is one of the most fundamental measures to guarantee the safety and stability of the foundation pits. Due to the great excavation depth, high ground water level and poor geological conditions of the foundation pits of Xincheng tunnel on the extension line of Jiefang Road in Hangzhou, there exist great difficulties in the construction of the foundation pits. Taking the construction of the foundation pits of Xincheng tunnel on the extension line of Jiefang Road in Hangzhou as example, the paper presents the retaining structure construction technology and the assistance measures adopted in the construction of the foundation pits.