内河码头回填料压缩-渗流耦合特性试验  

Experimental study on consolidation-seepage coupling of backfill in inland river ports

作　　者：梁越[1,2,3] 卢孝志 郝建云[3] 

机构地区：[1]重庆交通大学国家内河航道整治工程技术研究中心,重庆400074 [2]重庆交通大学水利水运工程教育部重点实验室,重庆400074 [3]重庆交通大学河海学院,重庆400074

出　　处：《水利水电科技进展》2014年第6期70-75,81,共7页Advances in Science and Technology of Water Resources

基　　金："十二五"国家科技支撑计划(2011BAB09B01);国家自然科学基金(51409029;51349007)

摘　　要：利用高级固结试验系统对不同配合比的砂泥岩混合料进行压缩固结试验,研究不同竖向压力下土体的压缩、回弹及再压缩过程中压缩与渗透的耦合变化特征。试验结果表明:土体的压缩系数随竖向压力的增大趋于稳定,随泥岩含量的增大而增大;压缩指数随泥岩含量的增大而增大,即泥岩含量越高,土体的压缩性越强;土体渗透系数随孔隙比的增大而加速增大,随泥岩含量的增大而减小;提出一维渗流-压缩固结耦合有限差分计算方法,克服了太沙基固结理论中渗透系数恒定及小变形的假定。We used the GDSCTS（ GDS advanced consolidation testing system） for consolidating and permeating experiments on the mixed filling with different mix proportion. To do this, we proposed experiments for studying the coupling characteristics of the consolidating and the permeating in soils compression under instantaneous step loading. The results show that the compressibility tends to be stable with the increasing vertical pressure and goes up with the increasing mudstone content. The compression index also increases with the increasing mudstone content, which means that the more the mudstone content is, the higher the compressibility of soil would be. The permeability exponentially increases with the increasing of the void ratio and decreases with the increasing of mudstone content. Thus, we proposed an algorithm based on the finite difference method for 1-D seepage-consolidation coupling. The algorithm is more appropriate to describe the consolidation of soils than the Terzaghi＇s consolidation theory because the permeability is related to the void ration and the large deformation is permitted in the new method.

关 键 词：砂泥岩混合料 压缩固结 渗透特性 压缩指数 孔隙水压力 有限差分法 内河码头 

分 类 号：U652.2[交通运输工程—港口、海岸及近海工程]