天津滨海新区吹填软土固化试验研究  

Experimental study of solidification of soft dredger fill in Tianjin Binhai New Area

作　　者：杨爱武[1,2] 周金[3] 孔令伟[2] 

机构地区：[1]天津大学天津市软土特性与工程环境重点实验室,天津300381 [2]中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,武汉430071 [3]中交四航工程研究院有限公司,广州510230

出　　处：《岩土力学》2013年第9期2442-2448,共7页Rock and Soil Mechanics

基　　金：天津市科技发展计划项目(No.06YFSZSF04000);国家自然科学基金项目(No.51179186)

摘　　要：天津滨海新区有大面积吹填软土,难以直接满足工程建设的要求,需进行固化处理。现采用主剂水泥和外加剂石膏、NaOH、Na2CO3和FeCl3,通过组合配比对天津滨海新区不同含水率的吹填软土分别进行室内固化试验,以无侧限抗压强度为指标,经有效地筛选和对比分析,确定了适用于不同工程性质的两种固化剂组合配比,并对固化土的微结构特征进行了分析研究。试验研究表明,水泥加适量的外加剂加固天津滨海新区吹填软土效果明显好于纯水泥土。微观结构分析表明,与同一龄期下水泥土相比,固化土生成的水化物更多,孔隙含量更少,表现出更稳定的微结构特性,也从机制上解释了该现象。There is large area of soft dredger fill in Tianjin Binhai New Area, which hard to meet the requirements of engineering construction, needed to be solidified. Through selecting cement as main agent; gypsum, NaOH, Na2CO3, and FeCl3 as assistant additives, a series of indoor consolidation experiments are performed for soft dredger fill with different water contents in Tianjin Binhai New Area. Using unconfined compression strength as a main factor, analysis of microstructure for solidified soil are made by choosing two kinds of solidification agent which are used for different programs through effective comparison and screening. The results show that solidified soft dredger fill in Tianjin Binhai New Area with cement and appropriate as well as a moderate amount of additional agent has an obvious advantage than solidified with pure cement. Microstructural analysis shows that compared with the same age of cement soil, more hydration and less pore content and more stable microstructure features generated by the solidified soil, which can explain the phenomenon from the mechanism.

关 键 词：吹填软土 抗压强度 固化剂 微观结构 

分 类 号：TU411[建筑科学—岩土工程]