水泥固化粉质土的无侧限抗压强度预测

Predication method of unconfined compression strength for cemented silty soils

对以粉质土为原料的水泥固化土进行了不同水泥掺入比、水灰质量比、龄期的系列试验.水泥掺入比相同时,水灰质量比越大,水泥固化粉质土的无侧限抗压强度越低;水灰质量比相同时,水泥掺入比越大,水泥固化粉质土的无侧限抗压强度越高,同时得出了水泥固化粉质土的无侧限抗压强度与似水灰质量比的倒数呈现线性关系,对于某一原料土,最大似水灰质量比是一个常值.基于似水灰质量比概念研究了水泥固化粉质土的强度预测方法,在28d龄期下,已知在某一水泥掺入比和水灰质量比的条件下的水泥固化粉质土的无侧限抗压强度值,即可用该方法预测其他龄期、水泥掺入比、水灰质量比条件下的水泥固化粉质土的无侧限抗压强度;水泥固化粉质土最大似水灰质量比R0与粉质土液限WL的关系不能用已有的经验关系式表示,其变化规律与已有的经验关系式给出的规律相反.

A series of laboratory tests were performed on cemented silty soils to understand their strength behavior. With the same cement content, the greater the water-cement ratio is, the lower the unconfined compressive strength of cemented silty soils is; with the same water-cement ratio, the greater the cement content is, the higher the unconfined compressive strength of cemented silty soils is. At the same time, the test results indicate that the unconfined compressive strength increases linearly with the inverse of quasi-water-cement ratio which is defined as the ratio of the total water weight to the cement weight before mixing, and the maximum quasi-water-cement ratio of original soils is a fixed constant. The method of predicting the unconfined compressive strength is discussed for cemented silty soils. With the unconfined compressive strength of cemented silty soils of 28 days under specific cement content and water-cement ratio, the unconfined compressive strength of cemented silty soils of other curing time, cement content and water-cement ratio can be predicted. The relationship between the maximum quasi-water-cement ratio and the liquid limit of original soils is also investigated. The relationship between the maximum quasi-water-cement ratio and the liquid limit of cemented silty soils does not fit the existing empirical formula, its variation regularity is contrary to the latter.