Evolution of macro-meso properties of intact loess under long-term seepage and its influence on irrigation-induced loess flowslides
文献类型：期刊论文
| 作者 | Jian Tao; Kong Ling-wei; Bai Wei; Liu Bing-heng; Sun Zhi-liang |
| 刊名 | JOURNAL OF MOUNTAIN SCIENCE
 |
| 出版日期 | 2022-10-01 |
| 卷号 | 19期号:10页码:2935 |
| 关键词 | Intact loess Long-term seepage Undrained shear behavior Static liquefaction Flowslides |
| ISSN号 | 1672-6316 |
| 英文摘要 | The loess tableland provides an excellent site for people to live and cultivate. However, flowslides occur frequently on the slope of loess tablelands due to agriculture irrigation, resulting in serious economic losses and casualties. The structure degradation effect of irrigation water seepage on intact loess leads to a weakening of its mechanical properties, which may be responsible for the recurrent occurrence of flowslides in irrigated loess tablelands. In this paper, seepage tests and triaxial tests were carried out to investigate the evolution of the microstructure and undrained shear properties of intact loess during seepage. The results show that water seepage leads to a significant decrease in pore water ion concentration and migration of fine particles with water flow, but no noticeably change in mineral composition. During seepage, the metastable structure of intact loess collapses, the fine particles disperse around the skeleton particle to fill the pores, and the total porosity decreases. The permeability coefficient gradually decreases with seepage time and then tends to a constant. The saturated intact loess shows strongly contractive behavior during undrained shear and has considerable liquefaction potential. After seepage, the intact loess is characterized by more rapid build-up of pore water pressure and more intense strain-softening during shearing and has lower shear strength (including peak strength and steady-state strength). In irrigated loess tablelands, long-term seepage could weaken the shear strength of intact loess and increases its liquefaction potential, which contributes to the initiation of loess flowslide failure and the movement with high-speeds and long run-outs. |
| 学科主题 | Environmental Sciences & Ecology |
| 语种 | 英语 |
| WOS记录号 | WOS:000873887900014 |
| 出版者 | SCIENCE PRESS |
| 源URL | [http://119.78.100.198/handle/2S6PX9GI/34778]  |
| 专题 | 中科院武汉岩土力学所 |
| 作者单位 | 1.Chinese Academy of Sciences; Wuhan Institute of Rock & Soil Mechanics, CAS; 2.Chinese Academy of Sciences; University of Chinese Academy of Sciences, CAS |
| 推荐引用方式 GB/T 7714 | Jian Tao,Kong Ling-wei,Bai Wei,et al. Evolution of macro-meso properties of intact loess under long-term seepage and its influence on irrigation-induced loess flowslides[J]. JOURNAL OF MOUNTAIN SCIENCE,2022,19(10):2935. |
| APA | Jian Tao,Kong Ling-wei,Bai Wei,Liu Bing-heng,&Sun Zhi-liang.(2022).Evolution of macro-meso properties of intact loess under long-term seepage and its influence on irrigation-induced loess flowslides.JOURNAL OF MOUNTAIN SCIENCE,19(10),2935. |
| MLA | Jian Tao,et al."Evolution of macro-meso properties of intact loess under long-term seepage and its influence on irrigation-induced loess flowslides".JOURNAL OF MOUNTAIN SCIENCE 19.10(2022):2935. |
入库方式： OAI收割
来源：武汉岩土力学研究所
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