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

IF 0.7 Q4 MECHANICS Studia Geotechnica et Mechanica Pub Date : 2022-09-01 DOI:10.2478/sgem-2022-0016
Salima Bouchemella, S. Taibi
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Abstract

Abstract 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.
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吸力对非饱和压实粘土-砂混合料力学特性的影响
摘要在这项工作中,在不同含水量下进行了一系列无侧限抗压试验,以研究在标准普氏条件下压实的粘土-砂混合物的力学性能。为了研究含水量和吸力对这些混合物的无侧限抗压强度(UCS)和应变割线模量(E50模量)的影响,通过使用渗透和盐溶液技术以及滤纸法测量土壤-水特性曲线(SWCC)来定义干湿路径。结果表明,混合物含砂量的增加会导致材料最大干密度的增加和最佳含水量的降低。然而,在给定状态下,当粘土与25%的沙子混合时,与粘土样品相比,UCS和E50模量分别增加到37%和70%。但当粘土与50%的沙子混合时,与粘土样品相比,UCS和E50模量分别降低到38%和46%。结果还表明,UCS和E50随着含水量的减少和吸力的增加而增加,而与含砂量无关。
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来源期刊
CiteScore
1.30
自引率
16.70%
发文量
20
审稿时长
16 weeks
期刊介绍: An international journal ‘Studia Geotechnica et Mechanica’ covers new developments in the broad areas of geomechanics as well as structural mechanics. The journal welcomes contributions dealing with original theoretical, numerical as well as experimental work. The following topics are of special interest: Constitutive relations for geomaterials (soils, rocks, concrete, etc.) Modeling of mechanical behaviour of heterogeneous materials at different scales Analysis of coupled thermo-hydro-chemo-mechanical problems Modeling of instabilities and localized deformation Experimental investigations of material properties at different scales Numerical algorithms: formulation and performance Application of numerical techniques to analysis of problems involving foundations, underground structures, slopes and embankment Risk and reliability analysis Analysis of concrete and masonry structures Modeling of case histories
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