Experimental Study on Mechanical Properties of Expansive Soil Improved by Xanthan Gum and Guar Gum

被引：3
|
作者：
Wang T. [1 ,2 ,3 ]
Wang L. [2 ,3 ]
Liu S. [2 ,3 ]
Zhang S. [2 ,3 ]
Wang O. [2 ,3 ]
机构：
[1] State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures, Shijiazhuang Tiedao University, Hebei, Shijiazhuang
[2] Key Laboratory of Roads and Railway Engineering Safety Control, Ministry of Education, Shijiazhuang Tiedao University, Hebei, Shijiazhuang
[3] School of Civil Engineering, Shijiazhuang Tiedao University, Hebei, Shijiazhuang
来源：
Zhongguo Tiedao Kexue/China Railway Science | 2023年 / 44卷 / 02期
关键词：
Cracks; Drying-wetting cycle; Expansive soil; Shear strength; Subgrade; Swelling-shrinkage property; Unconfined compressive strength;
D O I：
10.3969/j.issn.1001-4632.2023.02.01
中图分类号：
学科分类号：
摘要：
High quality filler of railway subgrade is shortage in expansive soil regions, so the environmentally friendly biopolymers can be used to improve expansive soil. The influence laws and microscopic mechanism of two biopolymers, xanthan gum and guar gum, on the mechanical properties of expansive soil were studied through conducting laboratory mechanical properties and microscopic analysis tests. The results show that the cementation formed by the reaction of xanthan gum and guar gum with minerals in soil can effectively improve the bonding strength among soil particles, increase the cohesion of soil, thereby reduce the expansion and shrinkage property of expansive soil, and improve its shear strength and unconfined compressive strength. The strength improvement effect of soil improved by guar gum is better than that of soil improved by xanthan gum, especially when the gum-soil ratio is 1. 0%, guar gum shows the best improvement effect under the comprehensive consideration of strength and deformation of the subgrade filling. The addition of xanthan gum and guar gum can effectively limit the development of cracks. The number and width of cracks in the improved soil of xanthan gum and guar gum are significantly lower than those in expansive soil with the same drying-wetting cycles. Meanwhile, the failure type changes from brittle failure to plastic failure. With the increase of drying-wetting cycles, the strength of both improved soil and expansive soil shows a trend of attenuation. However, compared with the expansive soil, the shear strength of guar gum improved soil increases significantly, while the xanthan gum improved soil has better stability. © 2023 Chinese Academy of Railway Sciences. All rights reserved.
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页码：1 / 10
页数：9
相关论文
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