当前位置: X-MOL 学术Landslides › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
The internal erosion process and effects of undisturbed loess due to water infiltration
Landslides ( IF 6.7 ) Pub Date : 2020-08-20 , DOI: 10.1007/s10346-020-01518-z
Jianqi Zhuang , Jianbing Peng , Yi Zhu , Yanqiu Leng , Xinghua Zhu , Weiliang Huang

Internal erosion is a complex phenomenon that is one of the main risk factors to soil destruction. Its occurrence is mainly due to water infiltration and can cause slope instability. “Karst soil” is a type of loess with special soil and water sensitivity that makes it prone to landsliding. The processes of internal erosion include transport erosion and chemical dissolution, which strongly effect loess structure and strength. To reveal the internal processes and effects of the loess due to water infiltration, field investigations and indoor tests, including infiltration tests, undrained triaxial tests, particle analysis, chemical analysis, and scanning electron microscopy (SEM), were conducted. The results show that (1) the fine particles (clay and silt) and chemicals can move within the matrix of the macro-pores under seepage flow. The physical internal erosion is mainly due to fine particle migration out of the water and clay and silt particles, and the sample column settlement was 3.3 cm with a settlement ratio of 16.5%, which results in changes to the soil skeleton, increasing the porosity and infiltration rate of loess. (2) Chemical dissolution is also an important internal erosion process in loess, especially cations of Na, Mg, Ca, and K and anions of Cl, SO4, and CO3, which are mainly lost due to dissolution and flow out of with water and clay particles, resulting in altered physical characteristics of the soil. (3) Soil particles’ mitigation and chemical dissolution change the loess structure, leading to skeletal destruction and decreased peak strength and residual strength of the infiltrated sample to 7.75% and 8.13%, respectively. During internal erosion, physical fine particle migration and chemical dissolution are important for loess stability and loess slope susceptible to failure during water infiltration.

中文翻译:

原状黄土的内部侵蚀过程及水入渗影响

内部侵蚀是一种复杂的现象,是土壤破坏的主要风险因素之一。其发生主要是由于渗水,会引起边坡失稳。“喀斯特土壤”是一种具有特殊水土敏感性的黄土,容易发生滑坡。内部侵蚀过程包括输运侵蚀和化学溶解,对黄土结构和强度影响很大。为了揭示黄土渗水的内部过程和影响,进行了实地调查和室内试验,包括渗透试验、不排水三轴试验、颗粒​​分析、化学分析和扫描电子显微镜(SEM)。结果表明:(1)细颗粒(粘土和淤泥)和化学物质在渗流作用下可以在大孔隙的基质内移动。物理内部侵蚀主要是由于细颗粒迁移出水体和粘土和粉砂颗粒,样品柱沉降为 3.3 cm,沉降率为 16.5%,导致土壤骨架发生变化,增加孔隙度和孔隙度。黄土的入渗率。(2) 化学溶解也是黄土内部侵蚀的一个重要过程,尤其是 Na、Mg、Ca、K 的阳离子和 Cl、SO4、CO3 的阴离子,主要因溶解而流失,随水和粘土颗粒,导致土壤物理特性发生改变。(3)土壤颗粒的缓释和化学溶解改变了黄土结构,导致骨骼破坏,入渗样品的峰值强度和残余强度分别下降7.75%和8.13%。在内部侵蚀过程中,
更新日期:2020-08-20
down
wechat
bug