Experimental investigation on the shear strength and deformation behaviour of xanthan gum and guar gum treated clayey sand

IF 2.5 3区 工程技术 Q2 ENGINEERING, CIVIL Geomechanics and Engineering Pub Date : 2021-01-01 DOI:10.12989/GAE.2021.26.2.101
Susheel Kumar, E. Sujatha
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引用次数: 5

Abstract

Soil stabilization is widely used to favourably amend the soil behaviour. The use of biopolymers to treat soil is not only an eco-friendly but is also a sustainable approach. Biopolymers, xanthan gum and guar gum are used to augment the strength of clayey sand. Xanthan gum is anionic while guar gum is non-ionic. Triaxial tests were conducted on treated soil samples to understand the effect of biopolymer treatment on clayey sand at different dosages and curing periods. Shear strength parameters –angle of internal friction and cohesion increases appreciably on treating soil with xanthan and guar gum for all dosages investigated, though angle of internal friction decreases with the curing period in case of xanthan gum treated soil. Xanthan gum performs better in enhancing the strength and deformation behaviour of the soil compared to guar gum. There is a substantial gain in early strength but as the curing period increases further, the rate of increase in strength is marginal. The deformation modulus at failure also increases with the biopolymer content. The reduction in post-peak strength of treated soil is sudden and drastic indicating brittle behavior. The energy absorption capacity of the biopolymer treated soil increases with increase in biopolymer content and curing period. The strength gain in soil can be ascribed to the formation of hydrogels that are cementitious in nature. Strength is also improved through the ionic / hydrogen bonds that are formed by biopolymer addition.
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黄原胶和瓜尔胶处理粘土砂的抗剪强度和变形特性试验研究
土壤稳定被广泛应用于改善土壤特性。使用生物聚合物来处理土壤不仅是一种环保的方法,也是一种可持续的方法。生物聚合物、黄原胶和瓜尔胶被用来增加粘土砂的强度。黄原胶是阴离子的,而瓜尔胶是非离子的。对处理后的土样进行三轴试验,了解不同剂量和养护时间下生物聚合物处理对粘性砂的影响。抗剪强度参数——内摩擦角和黏聚角在黄原胶和瓜尔胶处理下均显著增大,而内摩擦角随黄原胶处理时间的延长而减小。与瓜尔胶相比,黄原胶在增强土壤强度和变形性能方面表现更好。早期强度有很大的提高,但随着养护时间的进一步延长,强度的增加率是微乎其微的。破坏时的变形模量也随着生物聚合物含量的增加而增加。处理后土的峰后强度降低是突然而剧烈的,表现出脆性行为。生物聚合物处理土壤的吸能能力随生物聚合物含量的增加和养护时间的延长而增加。土壤中的强度增加可归因于水凝胶的形成,水凝胶本质上是胶凝的。通过生物聚合物加成形成的离子/氢键,强度也得到了提高。
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来源期刊
Geomechanics and Engineering
Geomechanics and Engineering ENGINEERING, CIVIL-ENGINEERING, GEOLOGICAL
CiteScore
5.20
自引率
25.00%
发文量
0
审稿时长
>12 weeks
期刊介绍: The Geomechanics and Engineering aims at opening an easy access to the valuable source of information and providing an excellent publication channel for the global community of researchers in the geomechanics and its applications. Typical subjects covered by the journal include: - Analytical, computational, and experimental multiscale and interaction mechanics- Computational and Theoretical Geomechnics- Foundations- Tunneling- Earth Structures- Site Characterization- Soil-Structure Interactions
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