Drained behaviour of artificially cemented dune aeolian sand

IF 1.7 Q3 ENGINEERING, GEOLOGICAL

Geomechanics and Geoengineering-An International Journal Pub Date : 2021-08-24 DOI:10.1080/17486025.2021.1961024

T. Fontoura, Olavo Francisco dos Santos, R. Severo, R. Coutinho

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Abstract

ABSTRACT Mixing cement and soil is a traditional technique used to improve their mechanical properties. Other studies proposed a rational dosage methodology for soil-cement mixtures. This method is based on the void-cement ratio and aimed at obtaining a particular strength level. The present study evaluated the validity of the void-cement ratio (η/Civ) and analysed the stress – strain – strength behaviour of aeolian dune sand from Natal, Brazil, mixed with cement. Isotropically consolidated drained triaxial compression tests (CID-C) were conducted with moulded samples containing 0.0, 2.5, 5.0 and 7.5% cement by weight of dry soil. Void ratios corresponded to three conditions of relative density: loose, medium and dense, with confining stresses of 50, 100, 200 and 300 kPa. The effect of void ratio, cement content and void-cement ratio on the stress-strain-strength behaviour of the mixtures was determined. The results showed that the void-cement ratio is an appropriate parameter to assess the effective strength of the cement-sand mixture studied.

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人工胶结沙丘风沙的排水特性

水泥与土混合是改善其力学性能的传统方法。其他研究提出了水泥土混合料的合理掺量方法。该方法基于空灰比，旨在获得特定的强度水平。本研究评估了孔隙-水泥比(η/Civ)的有效性，并分析了巴西纳塔尔风成沙丘砂与水泥混合后的应力-应变-强度行为。采用干土质量比分别为0.0、2.5、5.0和7.5%的水泥模样进行了各向同性固结排水三轴压缩试验。孔隙比对应的相对密度条件为松散、中等和致密，围应力分别为50、100、200和300 kPa。研究了孔隙比、水泥掺量和空灰比对混合料应力-应变-强度特性的影响。结果表明，空灰比是评价所研究水泥砂混合料有效强度的合适参数。

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来源期刊

Geomechanics and Geoengineering-An International Journal ENGINEERING, GEOLOGICAL-

CiteScore

3.80

自引率

0.00%

发文量

期刊介绍： Geomechanics is concerned with the application of the principle of mechanics to earth-materials (namely geo-material). Geoengineering covers a wide range of engineering disciplines related to geo-materials, such as foundation engineering, slope engineering, tunnelling, rock engineering, engineering geology and geo-environmental engineering. Geomechanics and Geoengineering is a major publication channel for research in the areas of soil and rock mechanics, geotechnical and geological engineering, engineering geology, geo-environmental engineering and all geo-material related engineering and science disciplines. The Journal provides an international forum for the exchange of innovative ideas, especially between researchers in Asia and the rest of the world.