Cracking process in expansive soil with and without vegetation covers in dry and rainy seasons at field scale

IF 1.9 4区农林科学 Q3 SOIL SCIENCE

Revista Brasileira De Ciencia Do Solo Pub Date : 2023-01-01 DOI:10.36783/18069657rbcs20230055

Silvio Romero de Melo Ferreira, Arthur Gomes Dantas Araújo, Martha Maria Bezerra Santos

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引用次数: 0

Abstract

ABSTRACT The presence of desiccation cracks in the soil alters its hydromechanical behavior, increasing the soil's water infiltration capacity, mobilizing the potential for expansion. This may affect the performance of the structural elements of the construction. This study aimed to evaluate the mechanics of expansion, contraction and cracking of the expansive soil of Paulista - Pernambuco, Brazil, through field trials, subject to wetting cycles and drying. The studied soil is a sandy silty clay of high compressibility with medium to very high expansion potential. The process of formation and propagation of cracks was analyzed using digital images and the monitoring of samples subjected to drying and wetting cycles. The indices of crack geometry increased with the advancement of desiccation but did not stabilize. During the wetting period, they tend to close. The pattern of cracks in the tests varied according to the presence or absence of vegetation. It was concluded that the vegetation cover has a significant influence on the standardization and the crack formation and propagation process.

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有无植被覆盖膨胀土在旱季和雨季的开裂过程

土壤中干裂的存在改变了土壤的水力学行为，增加了土壤的入渗能力，调动了土壤膨胀的潜力。这可能会影响建筑结构元件的性能。本研究旨在通过实地试验，评估巴西保利斯塔-伯南布哥膨胀土在湿循环和干燥条件下的膨胀、收缩和开裂机理。研究的土为高压缩性的砂质粉质粘土，具有中等至极高的膨胀势。利用数字图像和试样干湿循环监测分析了裂纹的形成和扩展过程。裂纹几何指数随干燥时间的增加而增加，但不稳定。在湿润期，它们往往会关闭。试验中裂缝的模式根据有无植被而变化。结果表明，植被覆盖度对标准化、裂缝形成和扩展过程有显著影响。

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来源期刊

Revista Brasileira De Ciencia Do Solo 农林科学-土壤科学

CiteScore

3.00

自引率

11.80%

发文量

审稿时长

9-24 weeks

期刊介绍： The Revista Brasileira de Ciência do Solo is a scientific journal published by the Brazilian Society for Soil Science (SBCS), founded in 1947, and is responsible for the propagation of original and inedited technical-scientific work of interest for Soil Science. Contributions must not have been previously published or submit to other periodicals, with the only exception of articles presented in summarized form at professional meetings. Literature reviews are accepted when solicited by the Editorial Board.