Formation mechanism of collapsing gully in southern China and the relationship with granite residual soil: A geotechnical perspective
文献类型：期刊论文
| 作者 | Liu, Xinyu2,3,4; Zhang, Xianwei2; Kong, Lingwei2; Wang, Gang2,3; Liu, Honghu1,5 |
| 刊名 | CATENA
 |
| 出版日期 | 2022-03-01 |
| 卷号 | 210期号:-页码:- |
| ISSN号 | 0341-8162 |
| 关键词 | Collapsing gully Soil erosion Granite residual soil Weathering Disintegration Cementation |
| 英文摘要 | Recently, there has been an increase in collapsing gullies in the south of China as one of the most destructive types of soil erosion. Most collapsing gullies are formed on a well-developed granite crust; thus, granite residual soil plays a critical role. However, the extent to which the geotechnical features of residual soil, especially soil disintegration, affects collapsing gully formation is poorly understood. This study performed laboratory disintegration tests on granite residual soil taken from the red soil, sandy soil, and detritus layers of a collapsing gully. The disintegration behaviour was quantified by defining the disintegration ratio, R-d, and three equivalent disintegration rates, v(I), v(II,) and vI(II), corresponding to R-d =10%, 30%, and 50%, respectively. The results revealed that the red soil layer (depth < 1.3 m) and the soil at the shallower depth of the sandy soil layer (depth < 3.0 m) showed similar disintegration behaviours, which were complete (R-d = 100%) and rapid, with vI values in the range of 66.7-266.7%/min. The soil disintegration in the sandy soil layer was characterised by an incremental increase in R-d to 100% within 100 min. The residual soil at the bottom of the sandy soil layer and the top of the detritus layer (depths of 4.0-8.0 m) disintegrated consistently at the first, after which the disintegration rate gradually decreased with v(III) lower than 1%/min. The detritus layer soil at a depth greater than 10.0 m showed incomplete disintegration, and the ultimate R-d was approximately 60%. The formation mechanism for the soil disintegration and gully collapse was also proposed. The weakening of cementation triggered the breakup of soil aggregates and led to soil disintegration and the occurrence of a gully collapse. This study provided new insights on gully erosion. |
| 学科主题 | Geology ; Agriculture ; Water Resources |
| 语种 | 英语 |
| 出版者 | ELSEVIER |
| WOS记录号 | WOS:000790432300001 |
| 源URL | [http://119.78.100.198/handle/2S6PX9GI/35516]  |
| 专题 | 中科院武汉岩土力学所 |
| 作者单位 | 1.State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling 712100, China 2.State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China 3.University of Chinese Academy of Sciences, Beijing 100049, China 4.Key Laboratory of Environmental Change and Natural Disaster, Ministry of Education, Beijing Normal University, Beijing 100875, China 5.Changjiang River Scientific Research Institute, Changjiang Water Resource Commission, Wuhan 430010, China |
| 推荐引用方式 GB/T 7714 | Liu, Xinyu,Zhang, Xianwei,Kong, Lingwei,et al. Formation mechanism of collapsing gully in southern China and the relationship with granite residual soil: A geotechnical perspective[J]. CATENA,2022,210(-):-. |
| APA | Liu, Xinyu,Zhang, Xianwei,Kong, Lingwei,Wang, Gang,&Liu, Honghu.(2022).Formation mechanism of collapsing gully in southern China and the relationship with granite residual soil: A geotechnical perspective.CATENA,210(-),-. |
| MLA | Liu, Xinyu,et al."Formation mechanism of collapsing gully in southern China and the relationship with granite residual soil: A geotechnical perspective".CATENA 210.-(2022):-. |
入库方式： OAI收割
来源：武汉岩土力学研究所
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