城市软土地区深基坑施工的力学行为分析

Mechanical Behavior Analysis of Deep Foundation Pit Construction in Urban Soft Soil Area

依托深圳某深基坑工程,开展了城市软土地区深基坑施工的力学行为分析,并根据现场的实际监测数据,深入解析了基坑围护结构及地表的水平位移和沉降变形的机理。监测数据表明,当基坑底部一次开挖进尺过大,且未及时跟进施工支撑时,将导致地表沉降和围护结构水平位移过大。在及时跟进支撑并严格控制一次开挖进尺后,地表沉降和围护结构水平位移均可得到有效控制。

Based on one deep foundation engineering in Shenzhen, a mechanical behavior analysis of deep foundation pit construction in urban soft soil area has been carried out in this paper. Furthermore, according to actual monitoring data on site, this paper also analyzes the foundation pit support structure and mechanism of surface horizontal displacement and settlement deformation. The monitoring data indicates that when one of the excavation footage at the bottom of the foundation pit is too large and the construction support is not followed up in time, it will cause an oversized surface settlement and horizontal displacement of the support structure. However, after a timely follow-up of support and strict control over one of the excavation footage, both surface settlement and horizontal displacement of the support structure can be controlled effectively.