Meso and micro pore structure test of Jingyang shallow loess

Rainfall and irrigation are the most common driving forces of geological disasters in loess areas. Generally, the infiltration depth is shallow and mainly controlled by microchannels. The pore structure has a significant influence on the seepage characteristics. Aiming to study the distribution of p...

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Main Authors: Xiaorui FENG, Xinghua ZHU, Hengfei SUN, Liang JU, Ruixiang WEN, Yongjiu XIAO
Format: Article
Language:zho
Published: Editorial Office of Hydrogeology & Engineering Geology 2024-11-01
Series:Shuiwen dizhi gongcheng dizhi
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Online Access:https://www.swdzgcdz.com/en/article/doi/10.16030/j.cnki.issn.1000-3665.202305008
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author Xiaorui FENG
Xinghua ZHU
Hengfei SUN
Liang JU
Ruixiang WEN
Yongjiu XIAO
author_facet Xiaorui FENG
Xinghua ZHU
Hengfei SUN
Liang JU
Ruixiang WEN
Yongjiu XIAO
author_sort Xiaorui FENG
collection DOAJ
description Rainfall and irrigation are the most common driving forces of geological disasters in loess areas. Generally, the infiltration depth is shallow and mainly controlled by microchannels. The pore structure has a significant influence on the seepage characteristics. Aiming to study the distribution of pore structure in shallow loess, this study analyzes the structural samples of loess using CT tomography and mercury intrusion methods in the southern plateau of Jingyang, Shaanxi Province. The changes in meso and micro pore structure characteristics with the burial depth of loess are observed and revealed. The results show that Jingyang shallow loess can be divided into three layers according to its pore structure characteristics: ① 1−2 m as the first layer, 3−4 m as the second layer, and 5 m as the third layer;② The diameter of more than 95% of the total pores are less than 1.0 mm, which mainly are spherical and columnar closed pores; ③ while more than 65% of the total pore are larger than 0.8 mm, and most of them are branched and columnar connected pores;④ With depth increasing, the pore connectivity gradually decreases, and the deformation and failure of macropores play a key role in the stability of loess structure;⑤ In the mercury intrusion test, intragranular pores are bounded by 0.2 μm. The proportion of pores on the left side shows insignificant change with depth, while on the right side, it increases with depth. This study provides a basis for further exploring the micro pore seepage mechanism of shallow loess in the future.
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publishDate 2024-11-01
publisher Editorial Office of Hydrogeology & Engineering Geology
record_format Article
series Shuiwen dizhi gongcheng dizhi
spelling doaj-art-77666daf2d984532ac7c3e5806b0a86e2025-01-18T03:53:12ZzhoEditorial Office of Hydrogeology & Engineering GeologyShuiwen dizhi gongcheng dizhi1000-36652024-11-0151613814810.16030/j.cnki.issn.1000-3665.202305008202305008Meso and micro pore structure test of Jingyang shallow loessXiaorui FENG0Xinghua ZHU1Hengfei SUN2Liang JU3Ruixiang WEN4Yongjiu XIAO5School of Geological Engineering and Surveying,Chang’an University, Xi’an, Shaanxi 710054, ChinaSchool of Geological Engineering and Surveying,Chang’an University, Xi’an, Shaanxi 710054, ChinaSchool of Geological Engineering and Surveying,Chang’an University, Xi’an, Shaanxi 710054, ChinaSchool of Geological Engineering and Surveying,Chang’an University, Xi’an, Shaanxi 710054, ChinaSchool of Geological Engineering and Surveying,Chang’an University, Xi’an, Shaanxi 710054, ChinaSchool of Geological Engineering and Surveying,Chang’an University, Xi’an, Shaanxi 710054, ChinaRainfall and irrigation are the most common driving forces of geological disasters in loess areas. Generally, the infiltration depth is shallow and mainly controlled by microchannels. The pore structure has a significant influence on the seepage characteristics. Aiming to study the distribution of pore structure in shallow loess, this study analyzes the structural samples of loess using CT tomography and mercury intrusion methods in the southern plateau of Jingyang, Shaanxi Province. The changes in meso and micro pore structure characteristics with the burial depth of loess are observed and revealed. The results show that Jingyang shallow loess can be divided into three layers according to its pore structure characteristics: ① 1−2 m as the first layer, 3−4 m as the second layer, and 5 m as the third layer;② The diameter of more than 95% of the total pores are less than 1.0 mm, which mainly are spherical and columnar closed pores; ③ while more than 65% of the total pore are larger than 0.8 mm, and most of them are branched and columnar connected pores;④ With depth increasing, the pore connectivity gradually decreases, and the deformation and failure of macropores play a key role in the stability of loess structure;⑤ In the mercury intrusion test, intragranular pores are bounded by 0.2 μm. The proportion of pores on the left side shows insignificant change with depth, while on the right side, it increases with depth. This study provides a basis for further exploring the micro pore seepage mechanism of shallow loess in the future.https://www.swdzgcdz.com/en/article/doi/10.16030/j.cnki.issn.1000-3665.202305008pore distributionpore shape distributionct testmalan loesspore classification
spellingShingle Xiaorui FENG
Xinghua ZHU
Hengfei SUN
Liang JU
Ruixiang WEN
Yongjiu XIAO
Meso and micro pore structure test of Jingyang shallow loess
Shuiwen dizhi gongcheng dizhi
pore distribution
pore shape distribution
ct test
malan loess
pore classification
title Meso and micro pore structure test of Jingyang shallow loess
title_full Meso and micro pore structure test of Jingyang shallow loess
title_fullStr Meso and micro pore structure test of Jingyang shallow loess
title_full_unstemmed Meso and micro pore structure test of Jingyang shallow loess
title_short Meso and micro pore structure test of Jingyang shallow loess
title_sort meso and micro pore structure test of jingyang shallow loess
topic pore distribution
pore shape distribution
ct test
malan loess
pore classification
url https://www.swdzgcdz.com/en/article/doi/10.16030/j.cnki.issn.1000-3665.202305008
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AT liangju mesoandmicroporestructuretestofjingyangshallowloess
AT ruixiangwen mesoandmicroporestructuretestofjingyangshallowloess
AT yongjiuxiao mesoandmicroporestructuretestofjingyangshallowloess