软土地区超大型深基坑的围护设计

The support system design for an over size & deep excavation in soft soil

以南京软土地区的某一超大型深基坑围护为例,首先介绍了基坑围护方案的选择,其次采用不同的土体参数对基坑典型断面进行计算,计算结果表明不同的土体参数对基坑安全性及围护方案经济性的影响巨大,设计人员应根据现场的实际选择合理的土体参数。最后详细阐述了基坑开挖过程中出现的基坑事故、产生的原因及相应的对策,可为软土地质条件下的基坑设计提供较好的借鉴与示范。

In this paper, the support system for an over size ＆ deep excavation in Nanjing soft soil district is introduced in detail. Different soil parameters are used for calculation of typical cross - sections. The result of calculation shows that soil parameters have an enormous influence on the safety and economy of the support system and the soil parameters should be selected according to actual situation. At last, the accidents of deep excavation are described and relevant countermeasures are put forward based on analysis results, which can provide example for design of deep excavation in soft soil district.