为了研究软土地区基坑分区开挖变形特性，本文以杭州新世界望江新城4号深基坑为背景，对分区施工过程中坑外土体及地连墙变形监测数据进行了分析，并采用数值模拟进行了对比分析。研究结果表明：基坑开挖过程中地连墙变形呈现抛物线型变化，且坑后基坑施工时会使地连墙出现推回位移；坑外深层土体变形与地连墙变形类似，但变形大小比地连墙变形小；坑外地表沉降值随着基坑的开挖逐渐增大，且受环境影响；墙顶沉降在基坑开挖和坑内主体结构修建过程中呈现“先隆起后沉降”的现象。

In order to study the deformation characteristics of foundation pit zoned excavation in soft soil area, this paper takes Hangzhou New World Wangjiang New City No.4 deep foundation pit as the background, and analyzes the deformation monitoring data of soil body and ground connecting wall outside the pit in the process of zoned construction, and uses numerical simulation to carry out a comparative analysis. The results show that: the deformation of the ground-connected wall shows parabolic changes during the excavation of the foundation pit, and the ground-connected wall will be pushed back to displacement during the construction of the pit; the deformation of the deep soil outside the pit is similar to the deformation of the ground-connected wall, but the size of the deformation is smaller than the deformation of the ground-connected wall; the value of the ground surface settlement outside the pit increases with the excavation of the foundation pit, and it is affected by the environment; the top of the wall settles in the process of the excavation of the foundation pit and the construction of the main structure inside the pit, and it shows a “bulge first and then settle”. The settlement of the top of the wall presents a phenomenon of "uplift first and then settlement" during the excavation of the foundation pit and the construction of the main structure in the pit.

国家重点研发计划资助(2023YFC3009400)；国家自然科学基金(52238009)；江西省自然科学基金(20223BBG71018)