摘要
河道淤泥气泡混合土(FMLSS)是固体土体和微孔组成的非均质复合材料,是一种具有轻质、高强度的新型土工材料,工程应用范围较广。基于不同地域的工程应用,面对温度变化明显,温差较大区域,需要进一步考察冻融对FMLSS工程性质的影响,其中压缩性是影响地基土承载性能与变形的重要指标。通过室内试验,研究了FMLSS在冻融条件下的压缩性及微观机理。试验结果表明:冻融对FMLSS的压缩性具有较明显的影响,根据压缩前后FMLSS内部微观特征分析可知,冻融对FMLSS内部微孔分布特性的影响是导致FMLSS压缩性变化的重要因素。此外,气泡掺入比、原料土含水量、水泥掺入比、养护时间等因素也对冻融后的FMLSS压缩性具有一定的影响。
River silt air bubble mixed soil(FMLSS)is a heterogeneous composite material composed of solid soil and micropores.It is a new type of geotechnical material with light weight and high strength,and has a wide range of engineering applications.Based on engineering applications in different regions,in the face of obvious temperature changes and large temperature differences,the impact of freeze-thaw on the engineering properties of FMLSS needs to be further investigated.Among them,compressibility is an important index affecting the bearing capacity and deformation of foundation soil.Through laboratory experiments,the compressibility and micromechanism of FMLSS under freeze-thaw conditions were studied.The experimental results show that freeze-thaw has a significant effect on the compressibility of FMLSS.According to the analysis of the internal micro-features of FMLSS before and after compression,it is known that the effect of freeze-thaw on the distribution characteristics of micropores in FMLSS is an important factor that causes the change of compressibility of FMLSS.In addition,factors such as bubble mixing ratio,raw material moisture content,cement mixing ratio,curing time and other factors also have a certain effect on the FMLSS compressibility after freezing and thawing.
作者
张琦
顾欢达
薛国强
张益平
ZHANG Qi;GU Huan-da;XUE Guo-qiang;ZHANG Yi-ping(School of Civil Engineering,Suzhou University of Science and Technology,Suzhou Jiangsu 215011,China;Housing and Urban-Rural Development Bureau of Changshu,Changshu Jiangsu 215500;China 3.Engineering Quality Inspection Center of Changshu,Changshu Jiangsu 215500 China)
出处
《江苏建筑》
2020年第3期76-81,共6页
Jiangsu Construction
基金
国家自然科学基金(51378327)。
关键词
河道淤泥气泡混合土
压缩性
微观机理
冻融
river silt and air bubble mixed soil
compressibility
micromechanism
freeze-thaw
