Salinity effect on the compaction behaviour,matric suction,stiffness and microstructure of a silty soil  

作　　者：Zi Ying Yu-Jun Cui Nadia Benahmed Myriam Duc 

机构地区：[1]Ecole des Ponts ParisTech,Laboratoire Navier/CERMES,6-8 av.Blaise Pascal,Cite Descartes,Champs-sur-Marne,Marne-la-Vallee cedex 2,77455,France [2]INRAE,Aix Marseille Univ,RECOVER,Equipe G2DR,3275 route Cezanne,CS 40061,Aix-en-Provence,13182,France [3]Universite Gustave Eiffel,IFSTTAR/GERS/SRO,14-20 boulevard Newton,Champs-sur-Marne,Marne-la-Vallee,77447,France

出　　处：《Journal of Rock Mechanics and Geotechnical Engineering》2021年第4期855-863,共9页岩石力学与岩土工程学报（英文版）

基　　金：the China Scholarship Council(CSC);Ecole des Ponts ParisTech(ENPC);INRAE for their financial support。

摘　　要：To better understand the salinity effect on the compaction behaviour of soil,standard Proctor compaction test was conducted on soil samples with different salinities.Matric suction and small-strain shear modulus,G_(max),were determined and pore size distribution was also investigated on samples statically compacted at different water contents.Results showed that with the decrease of soil salinity from initial value of 2.1‰(g of salt/kg of dry soil)to zero,the maximum dry density increased and the optimum water content decreased,whereas there was no significant change with the increase of soil salinity from 2.1‰ to 6.76‰.Interestingly,it was observed that G_(max) also decreased when the soil salinity decreased from initial value of 2.1‰ to zero and kept almost constant when the soil salinity increased from 2.1‰ to 6.76‰,for dry samples with similar matric suction and also for samples compacted at optimum state and on wet side whose matric suctions were slightly different due to the difference in remoulded water content.Furthermore,the effect of salinity on compaction behaviour and G_(max) decreased for samples compacted from dry side to wet side.The pore size distribution exhibited bi-modal characteristics with two populations of micro-and macro-pores not only for samples compacted on dry side and at optimum state,but also for those compacted on wet side.Further examination showed that the modal size of micro-pores shifted to lower values and that of macro-pores shifted to higher values for saline soil compared to the soil without salt.

关 键 词：SILTS COMPACTION SUCTION STIFFNESS MICROSTRUCTURE 

分 类 号：TU43[建筑科学—岩土工程]