Moistening Deformation and Microstructure Change of Undisturbed Loess Under Confined Conditions

Ying Gao; Yanxia Ma; Wuyu Zhang; Jiaqing Guo

doi:doi:10.11648/j.ijepp.20190702.15

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Moistening Deformation and Microstructure Change of Undisturbed Loess Under Confined Conditions

Ying Gao, Yanxia Ma, Wuyu Zhang, Jiaqing Guo

Published in International Journal of Environmental Protection and Policy (Volume 7, Issue 2)

Received: 22 April 2019 Published: 15 June 2019

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Abstract

Under the confined conditions, the influence of water content on the deformation characteristics of loess collapsing was studied by the indoor collapsibility test. The microscopic images were analyzed microstructural changes of the soil before and after the collapsing. The result shows that: (1) the higher the moisture content, the smaller vertical deformation of the sample after immersion in water under the same immersion pressure, and the smaller collapsibility. On the contrary, when the moisture water content is small, the main form of deformation is water immersion. After the collapse deformation, the amount of compression will decrease; (2) with the increase of water content, under the joint action of pressure and water, the soil structure tends to be dense, the particle filling area becomes larger, and the pore filling area decreases, and the pores are filled with clay and fine particles, and the connectivity between pores is reduced; (3) the average pore diameter, average pore area and average pore circumference of different soil samples after immersion are gradually reduced compared with the soil sample before immersion. The area is evenly distributed in each angular region and is related to macroscopic collapse deformation.

Published in	International Journal of Environmental Protection and Policy (Volume 7, Issue 2)
DOI	10.11648/j.ijepp.20190702.15
Page(s)	80-85
Creative Commons	This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.
Copyright	Copyright © The Author(s), 2019. Published by Science Publishing Group

Keywords

Collapsible Loess, Humidification, Pore Structure

References

[1]	Z. S. Guo. Analysis of deformation characteristics and stability of loess steep slope under humidification conditions [J]. Chinese Journal of Underground Space and Engineering, 2018, 14 (S1): 445-450+485.
[2]	W. Zhang. Research on Humidification Deformation Characteristics of Remolded Loess in Northwest China [J]. Water Resources Planning and Design, 2018 (01): 119-121.
[3]	C. L. Chen, P. Gao, Z. Q. Hu. The Humidification Deformation Characteristics of Loess and Its Relationship with Structural Properties [J]. Chinese Journal of Rock Mechanics and Engineering, 2006 (07): 1352-1360.
[4]	S. J. Shao, F. F. Zhou, C. X. Song. Analysis of Foundation Humidification Compression Deformation Considering Structural Changes of Loess [J]. China Civil Engineering Journal, 2006 (06): 94-99.
[5]	M. H. Zhang, Y. L. Xie, Liu Health. Characteristics of the collapsibility coefficient curve of loess during the increase (decrease) of wet soil [J]. Rock and Soil Mechanics, 2005 (09): 1363-1368.
[6]	Z. S. Guo. Analysis of deformation characteristics and stability of loess steep slope under humidification conditions [J]. Chinese Journal of Underground Space and Engineering, 2018, 14 (S1): 445-450+485.
[7]	F. L. Li. Effects of hydraulic water path on mechanical and hydraulic characteristics of loess under confined conditions [D]. Xi'an University of Technology, 2018.
[8]	X. X. Shao, H. Y. Zhang, D. J. He, et al. The process of unsaturated humidification deformation of compacted loess and its microscopic mechanism [J]. Journal of Yangtze River Scientific Research Institute, 2019, 36 (04): 82-87+92.
[9]	X. X. Shao. Study on unsaturated unsaturated deformation characteristics of loess [D]. Lanzhou University, 2018.
[10]	W. Zhang. Research on Humidification Deformation Characteristics of Remolded Loess in Northwest China [J]. Water Resources Planning and Design, 2018 (01): 119-121.
[11]	A. J. Zhang, Y. C. Xing, X. L. Hu, et al. Analysis of influencing factors of strong self-weight collapsibility of Yili loess [J]. Chinese Journal of Geotechnical Engineering, 2016, 38 (S2): 117-122.
[12]	X. W. Fang, Y. X. Ou, C. H. Li, et al. Study on the influence of wetting on microstructure and mechanical properties of undisturbed Q2 loess. J. Rock and Soil Mechanics, 2015, 36 (S2): 111-117.
[13]	X. W. Fang, C. N. Shen, C. H. Li, et al. Remolding the microstructure of Q2 loess. J. Chinese Journal of Underground Space and Engineering, 2014, 10 (06): 1231-1236+1329.
[14]	X. W. Fang, C. N. Shen, C. H. Li, et al. Microstructure characteristics and quantitative analysis of loess in Pucheng, Shaanxi Province. J. Chinese Journal of Rock Mechanics and Engineering, 2013, 32 (09): 1917-1925.
[15]	X. W. Fang, C. N. Shen, L. Wang, et al. Study on microstructure change of Q2 loess before and after water immersion. J. Rock and Soil Mechanics, 2013, 34 (05): 1319-1324.

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APA Style

Ying Gao, Yanxia Ma, Wuyu Zhang, Jiaqing Guo. (2019). Moistening Deformation and Microstructure Change of Undisturbed Loess Under Confined Conditions. International Journal of Environmental Protection and Policy, 7(2), 80-85. https://doi.org/10.11648/j.ijepp.20190702.15

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ACS Style

Ying Gao; Yanxia Ma; Wuyu Zhang; Jiaqing Guo. Moistening Deformation and Microstructure Change of Undisturbed Loess Under Confined Conditions. Int. J. Environ. Prot. Policy 2019, 7(2), 80-85. doi: 10.11648/j.ijepp.20190702.15

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AMA Style

Ying Gao, Yanxia Ma, Wuyu Zhang, Jiaqing Guo. Moistening Deformation and Microstructure Change of Undisturbed Loess Under Confined Conditions. Int J Environ Prot Policy. 2019;7(2):80-85. doi: 10.11648/j.ijepp.20190702.15

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@article{10.11648/j.ijepp.20190702.15,
  author = {Ying Gao and Yanxia Ma and Wuyu Zhang and Jiaqing Guo},
  title = {Moistening Deformation and Microstructure Change of Undisturbed Loess Under Confined Conditions},
  journal = {International Journal of Environmental Protection and Policy},
  volume = {7},
  number = {2},
  pages = {80-85},
  doi = {10.11648/j.ijepp.20190702.15},
  url = {https://doi.org/10.11648/j.ijepp.20190702.15},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ijepp.20190702.15},
  abstract = {Under the confined conditions, the influence of water content on the deformation characteristics of loess collapsing was studied by the indoor collapsibility test. The microscopic images were analyzed microstructural changes of the soil before and after the collapsing. The result shows that: (1) the higher the moisture content, the smaller vertical deformation of the sample after immersion in water under the same immersion pressure, and the smaller collapsibility. On the contrary, when the moisture water content is small, the main form of deformation is water immersion. After the collapse deformation, the amount of compression will decrease; (2) with the increase of water content, under the joint action of pressure and water, the soil structure tends to be dense, the particle filling area becomes larger, and the pore filling area decreases, and the pores are filled with clay and fine particles, and the connectivity between pores is reduced; (3) the average pore diameter, average pore area and average pore circumference of different soil samples after immersion are gradually reduced compared with the soil sample before immersion. The area is evenly distributed in each angular region and is related to macroscopic collapse deformation.},
 year = {2019}
}

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TY  - JOUR
T1  - Moistening Deformation and Microstructure Change of Undisturbed Loess Under Confined Conditions
AU  - Ying Gao
AU  - Yanxia Ma
AU  - Wuyu Zhang
AU  - Jiaqing Guo
Y1  - 2019/06/15
PY  - 2019
N1  - https://doi.org/10.11648/j.ijepp.20190702.15
DO  - 10.11648/j.ijepp.20190702.15
T2  - International Journal of Environmental Protection and Policy
JF  - International Journal of Environmental Protection and Policy
JO  - International Journal of Environmental Protection and Policy
SP  - 80
EP  - 85
PB  - Science Publishing Group
SN  - 2330-7536
UR  - https://doi.org/10.11648/j.ijepp.20190702.15
AB  - Under the confined conditions, the influence of water content on the deformation characteristics of loess collapsing was studied by the indoor collapsibility test. The microscopic images were analyzed microstructural changes of the soil before and after the collapsing. The result shows that: (1) the higher the moisture content, the smaller vertical deformation of the sample after immersion in water under the same immersion pressure, and the smaller collapsibility. On the contrary, when the moisture water content is small, the main form of deformation is water immersion. After the collapse deformation, the amount of compression will decrease; (2) with the increase of water content, under the joint action of pressure and water, the soil structure tends to be dense, the particle filling area becomes larger, and the pore filling area decreases, and the pores are filled with clay and fine particles, and the connectivity between pores is reduced; (3) the average pore diameter, average pore area and average pore circumference of different soil samples after immersion are gradually reduced compared with the soil sample before immersion. The area is evenly distributed in each angular region and is related to macroscopic collapse deformation.
VL  - 7
IS  - 2
ER  -

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Author Information

Ying Gao

School of Civil Engineering, Qinghai University, Xining, China
Yanxia Ma

School of Civil Engineering, Qinghai University, Xining, China
Wuyu Zhang

School of Civil Engineering, Qinghai University, Xining, China
Jiaqing Guo

School of Civil Engineering, Qinghai University, Xining, China

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Plain Text BibTeX RIS

APA Style

Ying Gao, Yanxia Ma, Wuyu Zhang, Jiaqing Guo. (2019). Moistening Deformation and Microstructure Change of Undisturbed Loess Under Confined Conditions. International Journal of Environmental Protection and Policy, 7(2), 80-85. https://doi.org/10.11648/j.ijepp.20190702.15

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ACS Style

Ying Gao; Yanxia Ma; Wuyu Zhang; Jiaqing Guo. Moistening Deformation and Microstructure Change of Undisturbed Loess Under Confined Conditions. Int. J. Environ. Prot. Policy 2019, 7(2), 80-85. doi: 10.11648/j.ijepp.20190702.15

Copy | Download

AMA Style

Ying Gao, Yanxia Ma, Wuyu Zhang, Jiaqing Guo. Moistening Deformation and Microstructure Change of Undisturbed Loess Under Confined Conditions. Int J Environ Prot Policy. 2019;7(2):80-85. doi: 10.11648/j.ijepp.20190702.15

Copy | Download

@article{10.11648/j.ijepp.20190702.15,
  author = {Ying Gao and Yanxia Ma and Wuyu Zhang and Jiaqing Guo},
  title = {Moistening Deformation and Microstructure Change of Undisturbed Loess Under Confined Conditions},
  journal = {International Journal of Environmental Protection and Policy},
  volume = {7},
  number = {2},
  pages = {80-85},
  doi = {10.11648/j.ijepp.20190702.15},
  url = {https://doi.org/10.11648/j.ijepp.20190702.15},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ijepp.20190702.15},
  abstract = {Under the confined conditions, the influence of water content on the deformation characteristics of loess collapsing was studied by the indoor collapsibility test. The microscopic images were analyzed microstructural changes of the soil before and after the collapsing. The result shows that: (1) the higher the moisture content, the smaller vertical deformation of the sample after immersion in water under the same immersion pressure, and the smaller collapsibility. On the contrary, when the moisture water content is small, the main form of deformation is water immersion. After the collapse deformation, the amount of compression will decrease; (2) with the increase of water content, under the joint action of pressure and water, the soil structure tends to be dense, the particle filling area becomes larger, and the pore filling area decreases, and the pores are filled with clay and fine particles, and the connectivity between pores is reduced; (3) the average pore diameter, average pore area and average pore circumference of different soil samples after immersion are gradually reduced compared with the soil sample before immersion. The area is evenly distributed in each angular region and is related to macroscopic collapse deformation.},
 year = {2019}
}

Copy | Download

TY  - JOUR
T1  - Moistening Deformation and Microstructure Change of Undisturbed Loess Under Confined Conditions
AU  - Ying Gao
AU  - Yanxia Ma
AU  - Wuyu Zhang
AU  - Jiaqing Guo
Y1  - 2019/06/15
PY  - 2019
N1  - https://doi.org/10.11648/j.ijepp.20190702.15
DO  - 10.11648/j.ijepp.20190702.15
T2  - International Journal of Environmental Protection and Policy
JF  - International Journal of Environmental Protection and Policy
JO  - International Journal of Environmental Protection and Policy
SP  - 80
EP  - 85
PB  - Science Publishing Group
SN  - 2330-7536
UR  - https://doi.org/10.11648/j.ijepp.20190702.15
AB  - Under the confined conditions, the influence of water content on the deformation characteristics of loess collapsing was studied by the indoor collapsibility test. The microscopic images were analyzed microstructural changes of the soil before and after the collapsing. The result shows that: (1) the higher the moisture content, the smaller vertical deformation of the sample after immersion in water under the same immersion pressure, and the smaller collapsibility. On the contrary, when the moisture water content is small, the main form of deformation is water immersion. After the collapse deformation, the amount of compression will decrease; (2) with the increase of water content, under the joint action of pressure and water, the soil structure tends to be dense, the particle filling area becomes larger, and the pore filling area decreases, and the pores are filled with clay and fine particles, and the connectivity between pores is reduced; (3) the average pore diameter, average pore area and average pore circumference of different soil samples after immersion are gradually reduced compared with the soil sample before immersion. The area is evenly distributed in each angular region and is related to macroscopic collapse deformation.
VL  - 7
IS  - 2
ER  -

Copy | Download