滨海软土地基超大面积浅基坑支护技术工程实践研究

Practices of supporting technology for shallow super-large excavations in coastal area under soft foundation conditions

由于淤泥质软土强度低、含水率高、压缩性大、流变性显著等特点,软土地基上的基坑工程开挖风险较大,其支护方案的选择对工程的造价、进度、质量影响明显,甚至成为工程能否顺利实施的关键。介绍了上海滨海地区淤泥质软土的特点,并结合浦江镇4个超大型基坑的工程实践,对常用基坑支护型式的应用效果进行综合分析比较,旨在为软土地区类似基坑工程的实践提供借鉴和参考。

Because of the low strength, high moisture content, high compressibility and marked rheology of sullage soft soils, the risk of excavating foundation pits in soft foundations is large. The option of support schemes has obvious effect on cost, progress and quality of projects. Sometimes it even becomes the key to the successful completion of the projects. Combined with the engineering practices of four super-large excavations in Pujiang Town of Shanghai, the characteristics of sullage soft soils in coastal areas of Shanghai are introduced, and the application effects of common supporting structures are also comprehensively analyzed and compared. The experience and conclusions may be helpful to the similar or even larger projects in the future.