粉煤灰加固处理吹填泥浆的试验研究

人工吹填造陆技术,为解决我国东南沿海地区经济建设所需陆域不足的问题提出了新思路,但对软土地基进行快速、经济的加固处理也成为急需解决的技术问题。采用粉煤灰作为添加剂,对福建吹填泥浆进行了加固处理,并对加固后吹填土体工程地质性质和微观结构特征进行了研究。研究中发现加固后土体的工程地质性质得到改善,且土体的工程地质性质的改善是与微观结构特征的变化密切相关的。因此,从宏观的工程地质性质到微观结构特征变化都说明粉煤灰作为添加剂加固处理吹填泥浆是可行的,并给出了确定粉煤灰掺入比的建议,从而为吹填土软土地基的加固处理提供了一种更经济的加固手段。

EXPERIMENTAL STUDY ON CONSOLIDATION OF DREDGER FILL SLURRY WITH FLY ASH

Making land by dredger fill provides a novel idea to solve the problem of lacking economic construction land in coastal area of Southeast China;but it is still a technical question to consolidate dredger fill foundation quickly and economically. Testing study that uses fly ash as additive to treat dredger fill slurry and to consolidate dredger fill foundation is carried out to find an efficient consolidation method. A number of experiments proves that the engineering geological properties of consolidated dredger fill has been improved. With the increase of the quantity of fly ash in dredger fill,the bearing capacity and shear strength of consolidated dredger fill are enhanced;and characteristics of consolidation are improved. There is close relationship between the changes of microstructure characteristics and improvements of engineering geological property. The structure type of consolidated dredger fill changes from flocculent structure to skeleton-flocculent structure,equivalent diameter of structure units becomes bigger,and a part of structure units became granular structure. The changes of microstructure directly lead to improvement of engineering geological property. It can be concluded that treating dredger fill slurry with fly ash is feasible and economical.