摘要
为了得到适用于高饱和度土固结分析的孔隙混合流体的压缩性计算公式,采用孔隙水压力来表示混合流体的压缩系数.推导过程中,不考虑气泡在水中的溶解,按Laplace公式建立气泡压强与水压的关系.分析了单个气泡对压缩性的影响,并进行了一维固结压缩试验,对混合流体的压缩系数公式进行了验证.结果表明:饱和度、水压和孔隙气的分散度是影响孔隙流体压缩性的3个主要因素;饱和度越小,气泡半径越大,混合流体的压缩性越大;若初始饱和度相同,当水压达到较大值时,气泡初始半径大小对压缩系数影响很小.将试验数值与其他研究者的计算结果进行对比,证明了所推导的理论公式能较好地分析预测孔隙混合流体的压缩系数.
In order to obtain the calculation formula for compressibility of pore mixture fluid,which is suitable to the consolidation analysis on soil with high degree of saturation,the compression coefficient of pore mixture fluid was expressed by the pore water pressure.In the derivation process,the dissolution of air bubble in water was neglected,and the relation between air bubble pressure and water pressure was established according to Laplace formula.The influence of single air bubble on compressibility was analyzed,and the one-dimensional consolidation compression tests were performed.In addition,the formula for compression coefficient of mixture fluid was verified.The results show that three major factors affecting the compressibility of pore fluid are degree of saturation,water pressure and dispersion degree of pore air.The smaller the degree of saturation is,or the bigger the radius of air bubble is,the larger the compressibility of mixture fluid is.If the initial degree of saturation is the same,the effect of initial radius of air bubble on compression coefficient is quite small when the water pressure reaches the maximum value.Through comparing the experimental results with the results calculated by other researchers,it is proved that the proposed theoretical formula can analyze and predict the compression coefficient of pore mixture fluid better.
出处
《沈阳工业大学学报》
EI
CAS
北大核心
2012年第6期703-709,共7页
Journal of Shenyang University of Technology
基金
国家自然科学基金资助项目(50878191)
宁波市科技创新团队基金资助项目(2011B81005)
关键词
封闭气泡
非饱和土
饱和度
压缩性
压缩流体
混合流体
固结
孔隙水压
孔隙气压
occluded air bubble
unsaturated soil
degree of saturation
compressibility
compressible fluid
mixture fluid
consolidation
pore water pressure
pore air pressure
