对渤海地区吹填土基本性质的对比分析

Comparison and analysis to the basic properties of dredger fill in Bohai sea region

针对渤海湾地区的吹填土,从粒度成分、矿物成分、物理化学性质等方面进行了对比分析。结果表明:渤海湾地区的土样颗粒相对细小,粒度组成以黏粒组为主,在物理性质中表现出塑性指数大,阳离子交换量大、有机质含量高、在塑性图内位于高液限黏土区的特殊性质;另外,受海湾区域内复杂的沉积物分布影响,不同地区吹填土的矿物变化规律不明显,而化学成分中易溶盐含量高,以钠离子和氯离子为主要化学成分,导致土体结构单元形成一定的胶结作用,造成土体物理化学性质不稳定。

In this paper,comparison and analysis to dredger fill in Bohai Sea regionis made from the aspects of granule composition,mineral composition, physical and chemical properties, and so on. Results indicate： the particle of soil samples of Bohai Sea region is relatively small,and the grain-size composition takes the clay group as the main part. The physical properties show the high plasticity index, large cation exchange capacity, high organic content, locating at the highly liquid limit clay area inside the plastic figure. In addition, the mineral variation laws of dredger fill in different parts are not obvious affected by the distribution of complex sediments in the bay area. The high content of soluble salts in the chemical composition, taking sodium and chloride ions as the main chemical composition, leads to the structural unit of dredger fill to form the certain cementation,which causes the physical and chemical properties of soil unstable.