武汉河漫滩相软土工程特性试验及对比研究

Test and comparative study on engineering characteristics of floodplain soft soil in Wuhan

从宏观及微观意义上认识不同地域软土的工程特性并分析其成因不仅具有重要的理论意义,对于工程设计施工也具有重要的参考价值。从基本物理力学性质、粒度分析、微观结构、矿物成分、元素分析等方面对武汉冲积河漫滩相淤泥质软土进行了一系列试验研究,结果表明:武汉软土是一种具有高含水率、高孔隙比、高压缩性、高黏粒含量、高有机质含量、中灵敏度的饱和软土,具有较强的结构性。并根据软土成因类型和地域分布特征,针对性选取了参考文献中他人研究的海相沉积的南海软土、海口软土和湖相沉积的北京翠湖湿地土的试验数据与文中的武汉软土进行对比分析,探讨了不同成因软土宏微观工程性质的异同性。软土的成因类型、地域分布、微观结构、矿物成分等因素影响和决定着软土的工程性质。

It is of great theoretical significance to understand the engineering characteristics of different regional soft soil and analyze its cause from the macroscopic and microcosmic meaning,and it also has important reference value for the engineering design and construction.In this paper,a series of experimental studies on the floodplain alluvial silt soft soil in Wuhan were carried out from the aspects of the basic physical and mechanical properties,the particle size analysis,the microstructure,the mineral composition and the element analysis.Results show that Wuhan soft soil is a kind of saturated soft soils with high moisture content,high void ratio,high compressibility,high clay content,high organic matter content and moderate sensitivity,and has strong structure property.According to the genetic types and geographical distribution characteristics of soft soil,we selected the experimental data of the littoral deposits of soft soils in the South China Sea and in Haikou,the lacustrine deposits of soft soil in Beijing Cuihu wetland from others'studies in references,and compared with the soft soil in Wuhan,discussed the similarities and differences of macro and micro engineering properties.Results suggest that the genetic type,regional distribution,microstructure and mineral composition of soft soil influence and determine its engineering properties.