Effects of tung oil and its induced hydrophobicity on the cracking behavior of purple soil exposed to wetting–drying cycle conditions

IF 5.4 1区农林科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Catena Pub Date : 2025-05-02 DOI:10.1016/j.catena.2025.109112

Qiyong Zhang , Jingtao Yang , Yuzhen Kong

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引用次数: 0

Abstract

Desiccation cracking is a common natural phenomenon in near-surface soils, often leading to geological disasters and soil erosion. Organic additive can influence soil cracking behavior, but the impact of hydrophobicity induced by organic additive on this behavior has not been thoroughly studied. Previous studies have shown that tung oil is widely used in soil treatment and serves as a highly effective inducer of soil hydrophobicity. Therefore, this study investigates the effects of tung oil and its induced hydrophobicity on the cracking behavior of purple soil exposed to wetting–drying cycle conditions. The research employs laboratory simulations, long-term monitoring, and image processing techniques. The results show that the hydrophobic effect causes soil samples to crack at higher water content and increases the maximum cracking velocity by impeding water migration during initial drying. During wetting–drying cycles, the differences in the changes of total crack length for 0–5% tung oil samples are mainly attributed to variations in the hydrophobicity and binding effect induced by tung oil. Regarding crack development, the hydrophobic effect of tung oil is stronger than its reinforcing effect, leading to enhanced crack formation during the final stage following initial drying.

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桐油及其诱导疏水性对干湿循环条件下紫色土开裂行为的影响

干裂是近地表土壤常见的自然现象，常导致地质灾害和水土流失。有机添加剂可以影响土壤的开裂行为，但有机添加剂引起的疏水性对土壤开裂行为的影响尚未得到深入的研究。以往的研究表明，桐油作为一种高效的土壤疏水性诱导剂被广泛应用于土壤处理中。因此，本研究考察了桐油及其诱导的疏水性对干湿循环条件下紫色土开裂行为的影响。该研究采用实验室模拟、长期监测和图像处理技术。结果表明：疏水效应使土样在含水率较高时开裂，并通过阻碍水分在初始干燥过程中的迁移而增大最大开裂速度；在干湿循环过程中，0 ~ 5%桐油样品总裂缝长度变化的差异主要归因于桐油引起的疏水性和结合效应的变化。在裂缝发育方面，桐油的疏水作用大于补强作用，导致初始干燥后期裂缝形成加快。

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来源期刊

Catena 环境科学-地球科学综合

CiteScore

10.50

自引率

9.70%

发文量

816

审稿时长

54 days

期刊介绍： Catena publishes papers describing original field and laboratory investigations and reviews on geoecology and landscape evolution with emphasis on interdisciplinary aspects of soil science, hydrology and geomorphology. It aims to disseminate new knowledge and foster better understanding of the physical environment, of evolutionary sequences that have resulted in past and current landscapes, and of the natural processes that are likely to determine the fate of our terrestrial environment. Papers within any one of the above topics are welcome provided they are of sufficiently wide interest and relevance.