水泥土的长期渗透特性研究

Long-Term Permeability Characteristics of Cement Soil

实施了水泥固化粉土和高岭土的室内渗透试验,在分析水泥土灰水比和龄期对渗透性影响的基础上,提出了不含拟合参数的水泥土长期渗透系数预测式。试验结果表明,与原土种类无关,同一龄期水泥土的渗透系数随灰水比的增大线性减小;粉土水泥土的渗透系数大于相同灰水比、相同龄期高岭土水泥土的渗透系数;水泥土渗透系数随灰水比的降低速率与原土的种类及龄期有关,粉土水泥土渗透系数随灰水比的降低速率大于相同龄期高岭土水泥土的渗透系数降低速率;与原土种类无关,水泥土的渗透系数随龄期的增大逐渐降低,在龄期超过28 d后,渗透系数随龄期的降低速率减小。预测式预测的结果基本反映了水泥土渗透系数随龄期的变化规律。

Indoor permeability tests of cement-stabilized silt and kaolin are conducted.Based on the analysis of the effect of cement-water ratio and curing time on permeability,a long-term permeability coefficient prediction formula of cement soil without fitting parameters is proposed.The results show that regardless of the original soil type,the permeability coefficient of cement soil decreases linearly with the increase of cement-water ratio at the same curing time;The permeability coefficient of cement-stabilized silt is greater than that permeability coefficient of cement-stabilized kaolin at the same cement-water ratio and curing time;The decreasing rate of cement soil permeability with cement-water ratio is related to the original soil type and curing time.The decreasing rate of permeability coefficient of cement-stabilized silt with cement-water ratio is greater than that cement-stabilized kaolin at the same curing time.Regardless of the original soil type,the permeability coefficient of cement soil decreases with the increase of curing time.After the time exceeds 28 days,the decreasing rate of the permeability coefficient decreases with curing time.The predicted results basically reflect the law of the permeability coefficient of cement soil with curing time.