Effects of wetting and drying alternation on the shear properties of root-loess composites

IF 1.2 4区农林科学 Q4 SOIL SCIENCE

Soil Research Pub Date : 2024-08-13 DOI:10.1071/sr24049

Ruihan Jiang, Peng Zhan, Chaobo Zhang, Jing Jiang

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引用次数: 0

Abstract

Context

Plant roots can increase soil shear strength and reinforce soil. However, wetting and drying alternation (WD) could lead to soil structure destruction, soil erosion and slope instability.

Aims

This study tried to explore the effects of wetting and drying alternation on shear mechanical properties of loess reinforced with root system.

Methods

Direct shear testing was conducted on alfalfa (Medicago sativa L.) root system-loess composites with three soil bulk densities (1.2 g·cm⁻³, 1.3 g·cm⁻³ and 1.4 g·cm⁻³) under 0, 1, 2 and 3 cycles of wetting and drying alternation (WD0, WD1, WD2 and WD3).

Key results

The morphological integrity of the root-loess composites was obviously better than the non-rooted loess after WD. Under the three soil bulk densities, negative power-law relationships were observed between the shear strength, cohesion and internal friction angle and the cycles of WD. WD deteriorated the soil shear strength. The most obvious decrease in soil shear strength occurred under WD1, which was 13.00–22.86% for the non-rooted loess and 17.33–25.09% for the root-loess composites. The cohesion was decreased more than the internal friction angle by WD.

Conclusions

The most obvious damage to the soil was under WD1. The roots inhibited the deterioration effect of WD on the shear property of loess, and the inhibition by the roots decreased with the cycles of WD.

Implications

The results could provide new insights into the mechanical relationship between plant roots and loess under WD, and provide a scientific basis for the ecological construction in the loess areas.

查看原文本刊更多论文

湿润和干燥交替对无根复合材料剪切特性的影响

背景植物根系可以增加土壤的抗剪强度并加固土壤。然而，干湿交替（WD）会导致土壤结构破坏、土壤侵蚀和边坡失稳。目的本研究试图探讨干湿交替对用根系加固的黄土的剪切力学性能的影响。方法对三种土壤容重（1.2 g-cm-3、1.3 g-cm-3 和 1.4 g-cm-3）的紫花苜蓿（Medicago sativa L.）根系-黄土复合材料在 0、1、2 和 3 个湿润和干燥交替周期（WD0、WD1、WD2 和 WD3）下进行直接剪切试验。主要结果WD后，无根黄土复合材料的形态完整性明显优于无根黄土。在三种土壤容重条件下，剪切强度、内聚力和内摩擦角与 WD 周期呈负幂律关系。WD 破坏了土壤的抗剪强度。在 WD1 条件下，土壤剪切强度的下降最为明显，无根黄土的下降幅度为 13.00-22.86%，无根黄土复合材料的下降幅度为 17.33-25.09%。WD 对内聚力的影响大于对内摩擦角的影响。结论 WD1 对土壤的破坏最为明显。根系抑制了 WD 对黄土剪切性能的恶化作用，并且根系的抑制作用随着 WD 周期的增加而减弱。研究意义该研究结果可为WD条件下植物根系与黄土之间的力学关系提供新的见解，为黄土地区的生态建设提供科学依据。

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

Soil Research SOIL SCIENCE-

CiteScore

3.20

自引率

6.20%

发文量

审稿时长

4.5 months

期刊介绍： Soil Research (formerly known as Australian Journal of Soil Research) is an international journal that aims to rapidly publish high-quality, novel research about fundamental and applied aspects of soil science. As well as publishing in traditional aspects of soil biology, soil physics and soil chemistry across terrestrial ecosystems, the journal welcomes manuscripts dealing with wider interactions of soils with the environment. Soil Research is published with the endorsement of the Commonwealth Scientific and Industrial Research Organisation (CSIRO) and the Australian Academy of Science.