里下河古潟湖相软土基本工程特性与形成机理的关系

THE RELATIONSHIP BETWEEN THE ENGINEERING PROPERTIES AND DEVELOPMENT MECHANISM OF THE ANCIENT LAGOON FACIES SOFT SOIL AT LIXIAHE

淮盐高速公路穿越的里下河地区,广泛分布有高含水量、高压缩性古潟湖相软土,工程性质很差,该层软土的工程性质与里下河古潟湖的形成机理密切相关。本文在对潟湖形成一般模式总结的基础上,结合苏北地区第四纪以来沉积环境及区域地质地貌变化情况,得出里下河古潟湖相软土的形成机理,并对淮沿高速公路盐线典型地段土样工程性质进行分析,根据土的工程性质的垂直变化,判断古潟湖相软土的分布情况,进而寻找古潟湖相软土工程性质与其形成机理之间的关系。

Lixiahe district, where the Huaiyan expressway runs, has broadly distribution of high water- content and high compressive ancient lagoon facies soft soil. The soil has engineering low - grade properties. There is a close relationship between its engineering properties and the development mechanism of Lixiahe lagoon. In this paper, it starts from changes of the sedimentary environment and local geology, points out the development mechanism of Lixiahe lagoon facies soft soil, based on the general development model of lagoon. After these, it analyzes the engineering properties of typical lagoon facies soft soil from Huaiyan expressway, and estimates the distribution of lagoon facies soft soil based on the vertical changes of its engineering properties. Finally, the paper gives the rela- tionship between its engineering properties and growth mechanism .