富水软土地层中心城区浅覆土管幕法分析研究  

Analysis and Research on Pipe Curtain Method for Shallow Overburden in Central Urban Area in Water-Rich Soft Soil Layer

作　　者：徐志玲 XU Zhiling

机构地区：[1]上海隧道工程有限公司,上海市200032

出　　处：《城市道桥与防洪》2024年第7期198-202,M0018,共6页Urban Roads Bridges & Flood Control

基　　金：上海隧道科研项目:(2020-sk-06)。

摘　　要：为解决富水软土地层中心城区浅覆土无临时支撑、无土体加固的全断面暗挖施工难题,通过对日本MMST、URT和PCR工法从浅覆土可行性、断面多样性、密封止水性等方面进行调研和对比分析,提出了适合上海地区的束合管幕工法(U-BIT工法)。该工法基于超前支护与永久结构合一的设计思路,在管幕顶进完成后,通过张拉环向预应力,使原本纵向顶进的离散型、小断面钢管群束合形成可横向承载的整体受力体系,具有断面多样性、施工高效性、环境友好性和开挖断面利用率高等特点。在上海轨道交通14号线武定路站工程首次成功应用,实现了富水软土地层中心城区浅覆土地下结构低扰动、小变形快速静默施工。In order to solve the problem of full-section trenchless construction without temporary support and soil reinforcement in shallow overburden of water-rich soft soil layer in central urban area,the theoretical basis and research direction of underground bundled integrated tunnel(U-BIT)method suitable for Shanghai are provide by investigating and comparing Japanese MMST,URT and PCR methods in terms of the feasibility of shallow overburden,the diversity of the section,and the sealing of water.This method is based on the design idea of the combined temporary initial support and permanent structure.After the pipe-curtain is jacked,through the tensioning ring prestressing,the original longitudinal jacked and discrete steel pipes with small cross-section are bundled together to form a complete force system that can be transversely loaded with cross-section diversity,high efficiency in construction,environmentally friendly,and high utilization rate of the excavation section.This method has been successfully applied for the first time in the project of Shanghai Metro Line 14 Wuding Station.It has achieved fast,silent,low-disturbance and low-deformation construction of underground structure with shallow overburden in central urban area in water-rich soft soil layer,making an outstanding contribution to the promotion of the great leap from"impossible to implement"to"friendly construction"for urban underground infrastructure which the excavation construction cannot be implemented.

关 键 词：富水软土 中心城区 浅覆土暗挖施工 管幕工法 束合管幕工法 

分 类 号：TU941[建筑科学—建筑技术科学]