滑动带土壤渗透性和微结构演变机制的启示:中国三峡库区黄土坡滑坡案例研究

IF 4.1 2区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY
Qianyun Wang, Huiming Tang, Pengju An, Kun Fang, Junrong Zhang, Minghao Miao, Qingwen Tan, Lei Huang, Shengming Hu
{"title":"滑动带土壤渗透性和微结构演变机制的启示:中国三峡库区黄土坡滑坡案例研究","authors":"Qianyun Wang, Huiming Tang, Pengju An, Kun Fang, Junrong Zhang, Minghao Miao, Qingwen Tan, Lei Huang, Shengming Hu","doi":"10.1007/s12583-023-1828-0","DOIUrl":null,"url":null,"abstract":"<p>A large number of laboratory investigations related to the permeability have been conducted on the sliding zones. Yet little attention has been paid to the particular sliding zones of the slide-prone Badong Formation. Here, we experimentally investigate the permeability nature and the mechanism of seepage in the viscous sliding zone of the Huangtupo Landslide. Saturated seepage tests have been performed first with consideration of six dry densities and thirteen hydraulic gradients, in conjunction with the mercury intrusion porosimetry test and scanning electron microscopy test for the microstructure analysis after seepage. The results show that seepage in the sliding zone soil does not follow Darcy’s Law, since there is a threshold hydraulic gradient (<i>i</i><sub>0</sub>) below which no flow is observed and a critical hydraulic gradient (<i>i</i><sub><i>cr</i></sub>) over which the hydraulic conductivity (<i>K</i>) tends to be stable. The percentage of bound water could be responsible for the occurrence of <i>i</i><sub>0</sub> and <i>i</i><sub><i>cr</i></sub>. Furthermore, pore size distributions (PSD) less than 0.6 µm and between 10 and 90 µm exhibit positive and negative correlations with the <i>i</i><sub>0</sub>, respectively, indicating that the <i>i</i><sub>0</sub> is related to the PSD. The mechanism accounting for this result is that pore water pressure forces fine clay particles into the surrounding large pores and converts arranged particles to discretely distributed ones, thereby weakening the connectivity of pores. The seepages in the sliding zones behave differently from that in the sliding mass and sliding bed in response to the permeability.</p>","PeriodicalId":15607,"journal":{"name":"Journal of Earth Science","volume":"16 1","pages":""},"PeriodicalIF":4.1000,"publicationDate":"2024-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Insight into the Permeability and Microstructure Evolution Mechanism of the Sliding Zone Soil: A Case Study from the Huangtupo Landslide, Three Gorges Reservoir, China\",\"authors\":\"Qianyun Wang, Huiming Tang, Pengju An, Kun Fang, Junrong Zhang, Minghao Miao, Qingwen Tan, Lei Huang, Shengming Hu\",\"doi\":\"10.1007/s12583-023-1828-0\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p>A large number of laboratory investigations related to the permeability have been conducted on the sliding zones. Yet little attention has been paid to the particular sliding zones of the slide-prone Badong Formation. Here, we experimentally investigate the permeability nature and the mechanism of seepage in the viscous sliding zone of the Huangtupo Landslide. Saturated seepage tests have been performed first with consideration of six dry densities and thirteen hydraulic gradients, in conjunction with the mercury intrusion porosimetry test and scanning electron microscopy test for the microstructure analysis after seepage. The results show that seepage in the sliding zone soil does not follow Darcy’s Law, since there is a threshold hydraulic gradient (<i>i</i><sub>0</sub>) below which no flow is observed and a critical hydraulic gradient (<i>i</i><sub><i>cr</i></sub>) over which the hydraulic conductivity (<i>K</i>) tends to be stable. The percentage of bound water could be responsible for the occurrence of <i>i</i><sub>0</sub> and <i>i</i><sub><i>cr</i></sub>. Furthermore, pore size distributions (PSD) less than 0.6 µm and between 10 and 90 µm exhibit positive and negative correlations with the <i>i</i><sub>0</sub>, respectively, indicating that the <i>i</i><sub>0</sub> is related to the PSD. The mechanism accounting for this result is that pore water pressure forces fine clay particles into the surrounding large pores and converts arranged particles to discretely distributed ones, thereby weakening the connectivity of pores. The seepages in the sliding zones behave differently from that in the sliding mass and sliding bed in response to the permeability.</p>\",\"PeriodicalId\":15607,\"journal\":{\"name\":\"Journal of Earth Science\",\"volume\":\"16 1\",\"pages\":\"\"},\"PeriodicalIF\":4.1000,\"publicationDate\":\"2024-06-25\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of Earth Science\",\"FirstCategoryId\":\"89\",\"ListUrlMain\":\"https://doi.org/10.1007/s12583-023-1828-0\",\"RegionNum\":2,\"RegionCategory\":\"地球科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"GEOSCIENCES, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Earth Science","FirstCategoryId":"89","ListUrlMain":"https://doi.org/10.1007/s12583-023-1828-0","RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"GEOSCIENCES, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0

摘要

对滑动带进行了大量与渗透性有关的实验室研究。然而,对于易滑动的巴东地层的特殊滑动带却很少有人关注。在此,我们通过实验研究了黄土坡滑坡粘性滑动带的渗透性质和渗流机制。首先进行了饱和渗流试验,考虑了六种干密度和十三种水力梯度,同时还进行了汞侵入孔隙度试验和扫描电镜试验,以分析渗流后的微观结构。结果表明,滑动带土壤中的渗流并不遵循达西定律,因为存在一个临界水力梯度(i0),低于该水力梯度就观察不到水流,而超过该水力梯度的临界水力梯度(icr),水导率(K)趋于稳定。结合水的百分比可能是出现 i0 和 icr 的原因。此外,小于 0.6 微米和介于 10 至 90 微米之间的孔径分布(PSD)分别与 i0 呈正相关和负相关,表明 i0 与 PSD 有关。造成这一结果的机理是孔隙水压力迫使细粘土颗粒进入周围的大孔隙,并将排列的颗粒转化为离散分布的颗粒,从而削弱了孔隙的连通性。滑动带中的渗流与滑块和滑床中的渗流在渗透性方面的表现不同。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Insight into the Permeability and Microstructure Evolution Mechanism of the Sliding Zone Soil: A Case Study from the Huangtupo Landslide, Three Gorges Reservoir, China

A large number of laboratory investigations related to the permeability have been conducted on the sliding zones. Yet little attention has been paid to the particular sliding zones of the slide-prone Badong Formation. Here, we experimentally investigate the permeability nature and the mechanism of seepage in the viscous sliding zone of the Huangtupo Landslide. Saturated seepage tests have been performed first with consideration of six dry densities and thirteen hydraulic gradients, in conjunction with the mercury intrusion porosimetry test and scanning electron microscopy test for the microstructure analysis after seepage. The results show that seepage in the sliding zone soil does not follow Darcy’s Law, since there is a threshold hydraulic gradient (i0) below which no flow is observed and a critical hydraulic gradient (icr) over which the hydraulic conductivity (K) tends to be stable. The percentage of bound water could be responsible for the occurrence of i0 and icr. Furthermore, pore size distributions (PSD) less than 0.6 µm and between 10 and 90 µm exhibit positive and negative correlations with the i0, respectively, indicating that the i0 is related to the PSD. The mechanism accounting for this result is that pore water pressure forces fine clay particles into the surrounding large pores and converts arranged particles to discretely distributed ones, thereby weakening the connectivity of pores. The seepages in the sliding zones behave differently from that in the sliding mass and sliding bed in response to the permeability.

求助全文
通过发布文献求助,成功后即可免费获取论文全文。 去求助
来源期刊
Journal of Earth Science
Journal of Earth Science 地学-地球科学综合
CiteScore
5.50
自引率
12.10%
发文量
128
审稿时长
4.5 months
期刊介绍: Journal of Earth Science (previously known as Journal of China University of Geosciences), issued bimonthly through China University of Geosciences, covers all branches of geology and related technology in the exploration and utilization of earth resources. Founded in 1990 as the Journal of China University of Geosciences, this publication is expanding its breadth of coverage to an international scope. Coverage includes such topics as geology, petrology, mineralogy, ore deposit geology, tectonics, paleontology, stratigraphy, sedimentology, geochemistry, geophysics and environmental sciences. Articles published in recent issues include Tectonics in the Northwestern West Philippine Basin; Creep Damage Characteristics of Soft Rock under Disturbance Loads; Simplicial Indicator Kriging; Tephra Discovered in High Resolution Peat Sediment and Its Indication to Climatic Event. The journal offers discussion of new theories, methods and discoveries; reports on recent achievements in the geosciences; and timely reviews of selected subjects.
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
copy
已复制链接
快去分享给好友吧!
我知道了
右上角分享
点击右上角分享
0
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术官方微信