The geomechanical properties of soils treated with nanosilica particles  

作　　者：Gizem Aksu Tugba Eskisar 

机构地区：[1]Asia Prefabrik Ltd.Co.,Kemalpasa,Izmir,35730,Turkey [2]Department of Civil Engineering,Ege University,Bornova,Izmir,35100,Turkey

出　　处：《Journal of Rock Mechanics and Geotechnical Engineering》2023年第4期954-969,共16页岩石力学与岩土工程学报（英文版）

基　　金：The authors thank to Ege University Central Research Test and Analysis Laboratory Application and Research Center(EGE-MATAL)for SEM images.

摘　　要：This study examines the effect of nanosilica(NS)additive to improve the mechanical properties of clay,clayey sand,and sand.The engineering properties of the soils were investigated through Atterberg limits,compaction,unconfined compression,ultrasonic pulse velocity(UPV),freeze-thaw,and direct shear tests.The NS content varied from 0%to 0.7%and cement content was 5%and 10%by the dry weight of the soil.The curing period varied from 7 d to 150 d.The consistency,compaction,and strength properties of the soils were affected by the presence of NS and cement.The optimum NS contents in clay specimens with 5%and 10%cement were 0.5%and 0.7%,respectively.It was 0.7%in sand specimens with both cement ratios,as well as 0.3%and 0.7%in clayey sand specimens with 5%and 10%cement,respectively.In terms of freeze-thaw resistance,clayey sand specimens containing 0.5%NS and 10%cement had the minimum strength loss.Exponential relationships existed between the ultrasonic pulse velocity(UPV)and the unconfined compressive strength(UCS)of soil specimens having the same curing period.The shear strength parameters of the soils also improved with the addition of NS.Scanning electron microscope(SEM)images demonstrated that cement and NS contributed to the improvement of the soils by producing a denser and more uniform structure.It was concluded that the minor addition of NS could potentially improve the geomechanical properties of the soils.

关 键 词：Nanosilica(NS) Atterberg limits COMPACTION Unconfined compressive strength(UCS) Ultrasonic pulse velocity(UPV) FREEZE-THAW 

分 类 号：X53[环境科学与工程—环境工程]