软土地区高层建筑深基坑支护工程变形监测分析

Deformation Monitoring&Analysis of Foundation Pit Supporting Works for High-rise Building in Soft Soil Area

基坑开挖必然会改变土体的原始应力场和位移场,从而进一步引起邻近地基土体内部产生附加内力和变形,这在软土地区表现得更为明显。软土具有强流塑性和高回弹性,该类地质条件下基坑工程施工难度大、安全隐患多且施工工期长。因此,在软土地区对基坑进行详细监测保证基坑工程安全顺利实施非常重要。以广州南沙地块项目深基坑开挖为例,对基坑支护结构、基坑周围的土体和相邻的构筑物进行全面且系统的监测,对监测结果进行详细讨论,研究结果可为类似地层条件基坑支护结构设计提供经验借鉴。

Foundation pit excavation will inevitably change the original stress field and displacement field of soil mass,and further cause additional internal force and deformation inside the foundation nearby,especially in the soft soil area.Soft soil is of strong flow plasticity and high resilience and,under such geological condition,the foundation pit engineering is subject to difficult construction,multiple safety risks and long construction period.Therefore,it is very important in soft soil area to carry out detailed monitoring on foundation pit to ensure safe and smooth construction.Herein the excavation of deep foundation pit in Guangzhou Nansha Plot Project was taken as an example,and comprehensive and systematic monitoring was conducted on the foundation pit supporting structure,the surrounding soil and the adjacent structures,and the monitoring result was discussed in detail.The research result may be referenced to the design of foundation pit supporting structure under similar strata conditions.