摘要
在我国沿海地区有着较多的软土地基,如何有效解决软土地基不均匀沉降的问题,成为我国建设发展的重点。泡沫轻质土作为一种新型轻质环保材料,提供了一种新思路,通过试验分析和数值模拟相结合的方式对泡沫轻质土材料的基本物理性能和在路堤工程当中的模拟应用进行了研究。通过室内试验研究泡沫轻质土的水固比参数对其物理性能的影响,发现泡沫轻质土的湿容重、无侧限抗压强度、抗折强度、收缩率随着水固比的减小而逐渐增大,泡沫轻质土的吸水率和流动度随着水固比的减小而逐渐减小,得到了无侧限抗压强度和抗折强度两者之间的函数关系式。通过对不同填筑材料下、不同容重和不同弹性模量的泡沫轻质土路堤以及不同泡沫轻质土填筑高度下的路堤竖向位移进行有限元数值模拟。发现采用泡沫轻质土材料填筑时,其路基最大沉降量只有普通填土的31%,而且随着填筑层数的增加,泡沫轻质土路堤沉降增大的速率要远远小于普通填土路堤沉降的速率。当弹性模量低于100MPa时,其路基的竖向应力受弹性模量的影响要比弹性模量大于100MPa时的影响要大。
There are many soft soil foundations in China’s coastal areas.How to effectively solve the problem of uneven settlement of soft soil foundation has become the focus of China’s construction and development.As a new lightweight environmental protection material,foamed lightweight soil provides us a new idea.The basic physical properties of foam lightweight soil materials and its application in embankment engineering are studied through experimental analysis and numerical simulation.Through laboratory tests,the influence of water solid ratio parameters on physical properties of foamed lightweight soil is studied.It is found that the wet bulk density,unconfined compressive strength,flexural strength and shrinkage rate of foam lightweight soil increase with the decrease of water solid ratio.The water absorption and fluidity of foam lightweight soil decrease gradually with the decrease of water solid ratio,and the unconfined compressive strength and flexural strength are obtained.The functional relationship between the two.The vertical displacement of the embankment under different filling materials,different bulk density and different elastic modulus of foamed lightweight soil embankment and different foamed lightweight soil under embankment height is simulated by finite element method.It is found that the maximum settlement of roadbed is only 31%of that of ordinary fill when foamed lightweight earth material is filled,and with the increase of the number of filling layers,the rate of settlement of the light weight soil embankment is much smaller than that of the ordinary embankment.When the elastic modulus is lower than 100 MPa,the influence of the elastic modulus on the vertical stress of the subgrade is greater than that when the elastic modulus is greater than 100 MPa.
作者
蔡历颖
李龙
宿杰
CAI Liying;LI Long;SU Jie(CSCEC Strait Construction and Development Co.,Ltd.,Fuzhou 350015,China)
出处
《建筑结构》
CSCD
北大核心
2021年第S01期2147-2152,共6页
Building Structure
关键词
泡沫轻质土
试验研究
数值模拟
foamed lightweight soil
experimental research
numerical analysis
