Effect of clay content to the strength of gravel soil in the source region of debris flow
文献类型：期刊论文
| 作者 | Chen Ning-sheng; Gao Yan-chao; Yang Cheng-lin; Hu Gui-sheng |
| 刊名 | JOURNAL OF MOUNTAIN SCIENCE
 |
| 出版日期 | 2018 |
| 卷号 | 15期号:10页码:2320-2334 |
| 关键词 | Debris flows Gravel soil Clay content Maximum shear stress Pore water pressure |
| ISSN号 | 1672-6316 |
| DOI | 10.1007/s11629-018-4911-8 |
| 文献子类 | Article |
| 英文摘要 | The production of runoff in the source area of a debris flow is the consequence of a reduction in soil strength. Gravel soil is widely distributed in the source region, and the influence of its clay content on soil strength is one of the important questions regarding the formation mechanism of debris flows. In this paper, the clay content in gravel soil is divided into groups of low clay content (1%, 2, 5%), moderate clay content (3.75%, 5.00%, 6.25%, 7.5%) and high clay content (10.0%, 12.5%, 15%). Tests of the unconsolidated undrained shear strength and consolidated drained shear strength were performed. The unconsolidated undrained shearing (UU) experiment simulates the rapid shear failure of loose gravel soil under the conditions of brief heavy rainfall. The consolidated drained shearing (CD) experiment simulates creep failure of consolidated sediment during extended rainfall. The pore water pressure first increased and then decreased as the clay content increased, and the increase in pore pressure was relatively high in the gravel soil sample when the clay content is in the range of 3.25-7.50%, and stress in the gravel soil is relatively low for a moderate clay content. Gravelly soils with a moderate clay content are more prone to debris-flow initiation. This paper presents a mathematical formula for the maximum shear stress and clay content of gravel soil under two conditions. The key processes whereby the soil fails and triggers a debris flow-volume contraction of soil, expansion of clay soil, and rise of pore pressure-cause reductions in the soil friction force and enhancement of the water content in the clay particles, and subsurface erosion of soil reduces the soil viscosity, which eventually reduces the soil strength so that the soil loses its stability, liquefies and generates a debris flow. |
| 电子版国际标准刊号 | 1993-0321 |
| 语种 | 英语 |
| WOS记录号 | WOS:000447295900018 |
| 源URL | [http://ir.imde.ac.cn/handle/131551/46335]  |
| 专题 | Journal of Mountain Science_Journal of Mountain Science-2018_Vol15 No.10 |
| 推荐引用方式 GB/T 7714 | Chen Ning-sheng,Gao Yan-chao,Yang Cheng-lin,et al. Effect of clay content to the strength of gravel soil in the source region of debris flow[J]. JOURNAL OF MOUNTAIN SCIENCE,2018,15(10):2320-2334. |
| APA | Chen Ning-sheng,Gao Yan-chao,Yang Cheng-lin,&Hu Gui-sheng.(2018).Effect of clay content to the strength of gravel soil in the source region of debris flow.JOURNAL OF MOUNTAIN SCIENCE,15(10),2320-2334. |
| MLA | Chen Ning-sheng,et al."Effect of clay content to the strength of gravel soil in the source region of debris flow".JOURNAL OF MOUNTAIN SCIENCE 15.10(2018):2320-2334. |
入库方式： OAI收割
来源：成都山地灾害与环境研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。