水泥土搅拌法加固软土地基的室内试验研究

Laboratory Experimental Study on the Improvement of Soft Soils by Cement-soil Deep Mixing Method

针对连云港软土的特殊性,采用室内试验,研究适宜于该地区海相软土的水泥土搅拌桩(湿法)的合理配比。试验结果表明:矿渣水泥能够适应软土高含盐量和高含粘量的特点,而添加粉煤灰没有明显效果,添加当地丰富的尾矿砂对水泥土强度存在负面影响;因此建议采用矿渣水泥,掺入适量的石膏、粉煤灰和SN-II添加剂进行软土地基加固。

Based on the special features of Lianyungang soft soils, the rational cement-soil proportion suitable for this type of soft soils by laboratory experiments was explored and discussed in this paper.The experimental results indicate that Lianyungang soft soils have selection on the cement variety, slag cement has the property to resist high salt content of soft soils and fit the heavy clay ; addition of lightweight of aggregate has no evident effects, and the addition of tailing sand rich in local area has negative effect on the strength of cemented soil;the composite additive SN-Ⅱ can increase the strength of cemented soil, comparatively.Blending experiments indicate that a good improvement effect of soft soils by DMM can be achieved by using slag cement and adding appropriate proportion of gypsum,lightweight aggregate and additive SN-Ⅱ together.