Effect of suction on the mechanical behaviour of unsaturated compacted clay–sand mixtures

Studia Geotechnica et Mechanica

article

Salima Bouchemella¹  Said Taibi² 

[1] INFRARES Laboratory, Department of Civil Engineering, University of Souk Ahras;LOMC, UMR CNRS 6394, Department of Civil Engineering, University of Le Havre Normandy

关键词: Suction;    Unsaturated soil;    Clay–sand mixture;    Unconfined compression strength;    Strain secant modulus;    Wetting–drying path;   

DOI  :  10.2478/sgem-2022-0016

学科分类：社会科学、人文和艺术（综合）

来源: Walter de Gruyter GmbH

【 摘 要 】

In this work, a series of unconfined compression tests at different water contents were performed to investigate the mechanical behaviour of clay–sand mixtures compacted in standard Proctor conditions. For studying the effect of water content and suction on unconfined compressive strength (UCS) and on strain secant modulus (E50 modulus) of these mixtures, drying–wetting paths were defined by measuring the soil–water characteristic curves (SWCCs) using osmotic and salt solution techniques and filter paper method. The results highlighted that an increase in sand content of the mixture leads to an increase in the maximum dry densities and a decrease in the optimum water content of the materials. However, at the given state, when clay is mixed with 25% of sand, the UCS and E50 modulus increase to 37% and 70%, respectively, compared to those of clayey samples. But when clay is mixed with 50% of sand, the UCS and E50 modulus decrease to 38% and 46%, respectively, compared to those of clayey samples. The results also indicate that the UCS and E50 increase with a decrease in the water content and an increase in suction, irrespective of the sand content.

【 授权许可】

CC BY