Shear strength of biopolymer amended soil under freeze-thaw cycles: Experimental investigation and DEM modeling

IF 6.9 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Engineering Geology Pub Date : 2025-05-04 DOI:10.1016/j.enggeo.2025.108108

Jiayu Gu , Junjun Ni , Shusen Liu , Yanbo Chen

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Abstract

Global climate change has caused frequent extreme weather events, leading to the degradation of soil engineering properties. Eco-friendly biopolymer has been considered for soil reinforcement under extreme climate. This study investigates the effects of biopolymer amendment on soil mechanical properties under freeze-thaw (F-T) cycles. Direct shear tests were conducted on plain soil (PS) and biopolymer reinforced soil (BRS) under varying water contents (5 %, 15 %, and 25 %) and F-T cycles. Microstructural analysis and numerical simulation were carried out to reveal the influence of biopolymer on the evolutions of microstructure, shear band and particle interaction. The results showed that biopolymer significantly enhanced soil strength, particularly at lower water contents, with strength increases of up to 3.6 times as water content decreased from 25 % to 5 %. BRS exhibited better resistance to strength deterioration under F-T cycles, with an average strength loss of 25.5 % compared to 35 % for PS after 10 cycles. SEM and MIP analyses demonstrated that biopolymer reduced porosity and pore size by filling voids and cementing particles while mitigating F-T damage. DEM simulations revealed that F-T cycles increase the shear band area and reduce the average contact force. However, the addition of biopolymer effectively mitigates the adverse effects of F-T cycles. Biopolymer is demonstrated to be effective in enhancing soil strength and durability in seasonally frozen ground region.

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冻融循环下生物聚合物改性土的抗剪强度：实验研究和DEM模型

全球气候变化导致极端天气事件频发，导致土壤工程性质退化。生态友好型生物聚合物已被考虑用于极端气候下的土壤加固。研究了冻融循环条件下生物聚合物对土壤力学特性的影响。在不同含水量（5%、15%和25%）和F-T循环下，对平原土（PS）和生物聚合物增强土（BRS）进行了直接剪切试验。通过微观结构分析和数值模拟揭示了生物聚合物对微观结构、剪切带和颗粒相互作用演变的影响。结果表明，生物聚合物显著提高了土壤强度，特别是在含水量较低时，当含水量从25%降低到5%时，强度增加了3.6倍。BRS在F-T循环下表现出更好的抗强度衰减能力，10次循环后平均强度损失为25.5%，而PS的平均强度损失为35%。SEM和MIP分析表明，生物聚合物通过填充空隙和固井颗粒来降低孔隙度和孔径，同时减轻F-T损伤。DEM模拟结果表明，F-T循环增加了剪切带面积，降低了平均接触力。然而，生物聚合物的加入有效地减轻了F-T循环的不利影响。生物聚合物在季节性冻土区具有提高土壤强度和耐久性的有效作用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Engineering Geology 地学-地球科学综合

CiteScore

13.70

自引率

12.20%

发文量

327

审稿时长

5.6 months

期刊介绍： Engineering Geology, an international interdisciplinary journal, serves as a bridge between earth sciences and engineering, focusing on geological and geotechnical engineering. It welcomes studies with relevance to engineering, environmental concerns, and safety, catering to engineering geologists with backgrounds in geology or civil/mining engineering. Topics include applied geomorphology, structural geology, geophysics, geochemistry, environmental geology, hydrogeology, land use planning, natural hazards, remote sensing, soil and rock mechanics, and applied geotechnical engineering. The journal provides a platform for research at the intersection of geology and engineering disciplines.