水泥土渗透特性与强度特性研究综述

Research status of seepage behavior and strength property of soil-cement

通过分析和归纳近年来水泥土研究成果,总结了水泥土的渗透和强度特性,并提出了水泥土耐久性和腐蚀性问题。水泥掺入比是影响水泥土渗透和强度的主要因素,渗透系数随掺入比或龄期的增加而减小,并趋于一定值。相同水泥掺入比条件下,龄期是影响水泥土渗透系数的主要因素;强度随掺入比或龄期的增加而增大,外掺剂是否改善水泥土强度取决于外掺剂的自身性质,强度随水灰比的增大而减小。应力应变曲线型态与围压相关,低围压下为软化型,并随围压的增大向硬化型发展;剪切破坏面上法向应力与轴向夹角θf随着围压增加而减小。

The researches of cement-soil in recent years are summed up. The permeability and strength properties of cement-soil are summarized and the durability and corrosion problems are put forward. Cement ratio is a main factor affecting the strength and permeability coefficient of cement-soil. Permeability coefficient decreases with the increasing of cement ratio or age and approach to a constant. Under the same cement ratio conditions, age is the key of permeability coefficient of cement-soil. Strength has a positive correlation with cement ratio or age, while decreases with the increasing of water cement ratio. Admixture whether improve strength of cement-soil or not depends on its properties. The curve of stress-strain relation is related to the confining pressure. The property of strain softening is shown under low confining pressure and gradually develops to hardening. The angle between the normal stress and axial direction decreases with the increasing of confining pressure in failure surface.