软土地基地下室加层的基坑支护

Supports of a foundation pit of story-adding basement in soft soils

通过某工程实例,阐述了地下室由3层增加到4层,在原有支护桩已基本完成施工的情况下,充分利用已有支护桩,采用长短桩结合、利用土拱作用原理、增加内支撑层数等措施,成功完成加层地下室的基坑支护。在施工过程中,紧紧依靠监测成果,通过对监测资料的分析、研究,判断支护结构的安全性。通过监测,证明了设计采取各种措施的安全合理性。本工程取得的经验对于类似工程具有指导意义。

Through a practical project,it is discussed how to make full use of the existing retaining piles and to adopt the combination of long and short piles,the theory of soil arching as well as the way of increasing layers of bracings so as to complete the supports of the foundation pit of the basement when it is changed from 3 stories to 4 ones.During the construction process,the safety of the retaining structures and the rationality of the approach used in the design are proved through the analysis of the monitoring data.The experience of this project has the guiding significance for similar projects.