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《Journal of Jilin University(Earth Science Edition)》 2012-01
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Pore Distribution Characteristics of Dredger Fill During Hierarchical Vacuum Preloading

YUAN Xiao-qing1,WANG Qing1,SUN Tie2,XIA Yu-bin3,CHEN Hui-e1,SONG Jing1 1.College of Construction Engineering,Jilin University,Changchun 130026,China 2.China Institute of Geotechnical Investigation and Surveying Co.,Ltd,Beijing 100007,China 3.CCCC Water Transportation Consultants Co.,Ltd,Beijing 100007,China  
In view of the problems such as the time of self-consolidation is long and the drain pipes are easy to clogged and consolidation will slow down gragually in practice,a grading vacuum preloading method is put forward,namely,vacuum preloading is imposed hierarchically,and simulation tests are carried out in laboratory.The test results show that the moisture content and the soluble salt content decreases gradually,the strength increases gradually during the consolidation process of dredger fill.The physical and chemical properties of dredger fill have been improved after the hierarchical vacuum preloading.At the same time,samples are tested by the mercury intrusion test which sampled from consolidation process and the pore distribution characteristics is analyzed by using fractal theory.It shows that the large size of pore will be compressed into more small pore with the increase of consolidation pressure and the variation of pore diameter distribution is changed from majority of large size pore(above 50%) into advantage of middle and small size pore,which are above 35% and above 35% respectively.
【Fund】: 国家自然科学基金项目(41172236 40372122 40902077);国家自然科学基金国际合作项目(40911120044);; 成都理工大学地质灾害防治与地质环境保护国家专业实验室开放基金(GZ2004-08);; 吉林大学博士研究生交叉学科科研资助计划项目(2011J014);吉林大学基本科研业务项目(200903198)
【CateGory Index】: TU472.33
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