海相淤泥水泥土特性室内试验研究

Research on the Characteristics of Marine Silt Soil-cement

无侧限抗压强度(q_(u))、剪切强度(τ)、压缩系数(a_(1-2))压缩模量(E_(s))和渗透系数(K_(v))是水泥土的重要特性指标,是水泥搅拌桩设计的基本依据。选取珠海洪湾片区典型的海相淤泥为研究对象,开展不同水泥掺入量、不同龄期的室内试验研究,获得了淤泥水泥土特性指标随水泥掺入量和龄期的变化规律以及各特性指标之间的相关性。研究结果表明:q_(u)、a_(1-2)、E_(s)与龄期呈对数关系;τ、K_(v)与龄期呈幂函数关系;q_(u)、τ与水泥掺入量呈线性关系;a_(1-2)、K_(v)与水泥掺入量呈幂函数关系;E_(s)与水泥掺入量呈对数关系;q_(u)与τ、a_(1-2)、E_(s)呈线性关系;q_(u)与K_(v)呈幂函数关系,研究成果可为类似水泥土特性参数取值提供参考。

Unconfined compressive strength(q_(u)),shear strength(τ),compression coefficient(a_(1-2)),compression modulus(E_(s))and permeability coefficient(K_(v))are the important characteristics of soil-cement and are the basis for the design of cement mixing piles.The typical marine silt in Hongwan area of Zhuhai is selected as the research object to carry out laboratory tests with different cement content and different ages,and the variation law of the characteristics of silt soil-cement with cement content and ages is obtained,as well as the correlation between each characteristic index.The results show that:q_(u),a_(1-2),E_(s) have logarithmic relationship with age;the relation betweenτ,K_(v) and age is a power function;q_(u) andτhave a linear relationship with cement content;the relationship between a_(1-2),K_(v)and cement content is a power function;there is a logarithmic relationship between E_(s)and cement content;q_(u)is linear withτ,a_(1-2),E_(s);and the relationship between q_(u) and K_(v) is a power function.The research results can provide reference for the value of similar soil-cement properties.