软土地区保留建筑下方深基坑设计及分析  

Design and Analysis of Deep Excavation Under a Historical Building in Soft Soil Area

作　　者：黄开勇 梁志荣 万延阳 HUANG Kaiyong;LIANG Zhirong;WAN Yanyang(Shanghai Shen Yuan Geotechnical Engineering Co.Ltd.,Shanghai 200011)

机构地区：[1]上海申元岩土工程有限公司,上海200011

出　　处：《土工基础》2023年第6期920-925,共6页Soil Engineering and Foundation

基　　金：上海市青年科技英才扬帆计划(21YF1432600);上海市地质之星人才计划(Dzxh202208);上海市优秀技术带头人计划(22XD1432800);上海市青年科技启明星计划(21QB1404400)。

摘　　要：以上海某项目为例,介绍软土地区保留建筑地下空间分区顺作、局部盖挖关键技术。施工时首先保留建筑最终位置下方的竖向支承体系以及地下室顶板,然后将保留建筑平移至最终位置进行基础托换。根据环境特点进行基坑分区,依次顺作施工非保留建筑区和保留建筑所在区,保留建筑下方采用局部盖挖。基坑支护结构采用地下连续墙结合四道钢筋混凝土支撑。监测数据表明,基坑施工期间,保留建筑结构始终安全稳定;围护结构侧向位移可以满足周边环境保护要求,其中,基坑长边角部以及短边围护侧移明显小于长边中部,小坑围护侧移明显小于大坑。This paper presents a case history of the foundation construction under a preserved historical building.Aspects of partitioned bottom-up construction and partial covered excavation of the underground space under a historical building in soft soil area are discussed.Before the historical building was transferred to the permanent position for the required underpinning,the vertical supporting systems and the basement ceiling at the final location were constructed first.The excavation was partitioned in consideration of its complicated surroundings,the zone with the historical building was constructed in bottom-up method after the other one was completed.The region under the historical building was partial covered excavated.Diaphragm walls with four-layer reinforced concrete struts were utilized as the supporting structures.The monitoring data indicated the preserved historical building structure was safe and stable during the entire excavation and the lateral displacements of the supporting structures well met the protection requirements of the surroundings.The deformations in the short side or at the corner of long side were significantly smaller than those in the middle of the long side,and the wall deflections of the small zone were evidently smaller than those of the larger excavated area.

关 键 词：软土 保留建筑 深基坑 基础托换 建筑平移 局部盖挖 

分 类 号：TU473[建筑科学—结构工程]