{"title":"湿润和干燥交替对无根复合材料剪切特性的影响","authors":"Ruihan Jiang, Peng Zhan, Chaobo Zhang, Jing Jiang","doi":"10.1071/sr24049","DOIUrl":null,"url":null,"abstract":"<strong> Context</strong><p>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.</p><strong> Aims</strong><p>This study tried to explore the effects of wetting and drying alternation on shear mechanical properties of loess reinforced with root system.</p><strong> Methods</strong><p>Direct shear testing was conducted on alfalfa (<i>Medicago sativa L</i>.) root system-loess composites with three soil bulk densities (1.2 g·cm<sup>−3</sup>, 1.3 g·cm<sup>−3</sup> and 1.4 g·cm<sup>−3</sup>) under 0, 1, 2 and 3 cycles of wetting and drying alternation (WD0, WD1, WD2 and WD3).</p><strong> Key results</strong><p>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.</p><strong> Conclusions</strong><p>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.</p><strong> Implications</strong><p>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.</p>","PeriodicalId":21818,"journal":{"name":"Soil Research","volume":null,"pages":null},"PeriodicalIF":1.2000,"publicationDate":"2024-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Effects of wetting and drying alternation on the shear properties of root-loess composites\",\"authors\":\"Ruihan Jiang, Peng Zhan, Chaobo Zhang, Jing Jiang\",\"doi\":\"10.1071/sr24049\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<strong> Context</strong><p>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.</p><strong> Aims</strong><p>This study tried to explore the effects of wetting and drying alternation on shear mechanical properties of loess reinforced with root system.</p><strong> Methods</strong><p>Direct shear testing was conducted on alfalfa (<i>Medicago sativa L</i>.) root system-loess composites with three soil bulk densities (1.2 g·cm<sup>−3</sup>, 1.3 g·cm<sup>−3</sup> and 1.4 g·cm<sup>−3</sup>) under 0, 1, 2 and 3 cycles of wetting and drying alternation (WD0, WD1, WD2 and WD3).</p><strong> Key results</strong><p>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.</p><strong> Conclusions</strong><p>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.</p><strong> Implications</strong><p>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.</p>\",\"PeriodicalId\":21818,\"journal\":{\"name\":\"Soil Research\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":1.2000,\"publicationDate\":\"2024-08-13\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Soil Research\",\"FirstCategoryId\":\"97\",\"ListUrlMain\":\"https://doi.org/10.1071/sr24049\",\"RegionNum\":4,\"RegionCategory\":\"农林科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q4\",\"JCRName\":\"SOIL SCIENCE\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Soil Research","FirstCategoryId":"97","ListUrlMain":"https://doi.org/10.1071/sr24049","RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"SOIL SCIENCE","Score":null,"Total":0}
Effects of wetting and drying alternation on the shear properties of root-loess composites
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.
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.
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