坑外搅拌桩加固对基坑变形的影响分析

在软土基坑施工过程中,由于地铁盾构进出洞以及为了保护基坑周围建筑物等原因,常常会进行坑外加固。坑外加固会提高土体强度,也会对基坑变形产生影响。本文结合上海地铁某车站端头井加固的工程实例,分析了坑外搅拌桩加固对基坑变形造成的不利影响,并在此基础上提出了一些减少坑外加固影响的控制措施,希望对以后的类似工程提供借鉴。

Researches on excavation deformation caused by cement mixing method outside excavation

During the construction of excavation in soft soils,soil reinforcement outside the excavation is used usually in order to protect the departure and reception of shield and surrounding buildings.Soil reinforcement outside the excavation will improve the strength of soil and affect excavation deformation.Combined with a project example of a metro station in Shanghai,the negative influence induced by excavation deformation caused by cement mixing method outside the excavation was analyzed.Based on the analysis,some measures were put forward in order to reduce the effect of soil reinforcement outside the excavation.These valuable measures are helpful to similar projects.