水泥改性土及水泥土处理膨胀土地基技术

Treatment Technology of Expansive Soil Foundation with Cement Modified Soil and Cement Soil

南水北调工程一期工程陶岔—沙河南淅川段膨胀土的分布范围较广,鉴于膨胀土遇水膨胀、失水收缩的特性,膨胀土地基需要处理后才能使用。根据地基土自由膨胀率的不同,添加不同比例的水泥,通过控制成品的离散系数和压实系数,以及控制过渡层的施工技术,达到改良膨胀土地基的目的。实例验证表明,采用水泥改性土或水泥土处理膨胀土地基可明显改善地基的性质,施工效果良好。

The expansive soil widely distributes in Taocha-Shahe River in Xichuan along the first phase of the South-North Water Diversion Project. It expands with water and shrinks without water, so the foundation must be treated at first. The cement were added in different ratio to the expansive soil foundation with different free expansion rate to control its dispersion coefficient and compact coefficient, at the same time to control the con- struction technology of the transition layer so as to have better the expansive soil foundation. The example shows that the cement modified soil or cement soil are used to treat the foundation and evidently improve the expansive soil nature to obtain the good effects.