吹填珊瑚砂地基软弱夹层特性

Weak sandwich characteristic of dredger fill coral sand foundation

新近吹填珊瑚砂地基在施工过程中形成的软弱夹层分布范围广、厚度随机、无明显规律、工程性质差,给工程建设带来极大的难度和挑战。通过室内试验对珊瑚砂地基中软弱夹层特性进行分析研究。结果表明:软弱夹层主要以粉土为主,具有较高的塑限;抗剪强度指标比一般天然粉砂-粉土的抗剪强度指标高;土中细颗粒(<0.075 mm)含量越大,土的最佳含水率越大、最大干密度越小。

The weak sandwich formed during construction of the newly filled coral sand foundation is characterized by broad distribution,random thickness,poor engineering property,and shows no apparent rule,thus it brings great difficulty and challenge on the engineering construction.So,we carry out an in-door experiment to study the characteristics of the weak sandwich.The results show that the weak sandwich is mainly made of silty soil and has a high plastic limit;its shear strength is higher that of the natural powder sand;the more the content of the fine particle(with particle size of less than 0.075 mm),the higher water content in the soil and the smaller the maximum dry density.