滑降式预支撑体系与传统支护体系基坑变形对比研究

Comparative Study on Deformation between Sliding Type Rapid Pre-Support System and Conventional Support Systems in Foundation Pits

摘要: 随着地下工程基坑深度持续加深，传统基坑支护体系受限于施工效率与变形协调能力，难以满足深基坑的严苛变形要求。基于上海轨道交通市域线机场联络线工程四处深基坑案例，结合现场监测数据量化分析，对采用滑降式预支撑体系的基坑围护结构侧移变形与传统支护体系的围护结构侧移变形进行对比研究。滑降式预支撑体系通过模块化滑降结构与实时应力补偿协同作用机制，最大水平位移较传统体系减少23%~30%，实现支护结构“随挖随支”的动态响应，为高效基坑支护施工提供借鉴作用。

Abstract: With the increasing depth of underground foundation pits, conventional retaining systems face challenges in meeting stringent deformation requirements due to limitations in construction efficiency and deformation coordination. This study focuses on four deep foundation pits in the Shanghai Rail Transit Airport Link Project, conducting a comparative analysis of lateral deformations in retaining structures between the sliding type rapid pre-support system and conventional systems through quantitative field monitoring data. The sliding type rapid pre-support system integrates a modular sliding-down structure with a real-time stress compensation mechanism, enabling dynamic “excavation-support synchronization”. Results indicate that the maximum horizontal displacement of the sliding type rapid pre-support system is reduced by 23%~30% compared to conventional systems. This research validates the effectiveness of the SDPS in deep excavation scenarios, providing a valuable reference for efficient foundation pit support construction.