超深地连墙施工方法研究

Research on Construction Method of Ultra Deep Ground Wall

本文以扬子科创中心三期项目为例,重点介绍了在长江漫滩地质情况下,砂层较厚地层中成槽作业,两墙合一地下连续墙结构垂直度要求高,施工时在地层变化时容易产生错位,卵石层易缩径塌孔。针对上述重难点问题,从设备选型、工艺参数制定等一系列方面采取的针对性方法,解决逆作法超深基坑地连墙施工中的问题。主旨介绍处理难点的办法,取得的施工作用,最终质量满足相关技术要求的情况下完成了本项目,为类似地质情况中的地连墙工程施工提供一定的参考。

This article takes the third phase project of the Yangzi Science and Technology Innovation Center as an example,focusing on the geological conditions of the Yangtze River floodplain,where slot forming operations are carried out in thick sand layers,and the verticality of the underground continuous wall structure with two walls in one is required to be high.During construction,it is easy to cause misalignment when the strata change,and the gravel layer is prone to shrinkage and collapse.In response to the above-mentioned key and difficult issues,targeted methods have been adopted from various aspects such as equipment selection and process parameter formulation to solve the problems in the construction of super deep foundation pit connecting walls using reverse constructionmethods.The main idea is to introduce the methods for handling difficulties,the construction effects achieved,and the completion of this project with the final quality meeting relevant technical requirements,whichprovides a certain reference for the construction of diaphragm walls in similar geological conditions.