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On-line Access: 2019-05-06

Received: 2018-10-22

Revision Accepted: 2019-04-07

Crosschecked: 2019-04-11

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Citations:  Bibtex RefMan EndNote GB/T7714

 ORCID:

Alfrendo Satyanaga

https://orcid.org/0000-0003-3849-2525

Harianto Rahardjo

https://orcid.org/0000-0002-8320-9170

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Journal of Zhejiang University SCIENCE A 2019 Vol.20 No.5 P.368-374

10.1631/jzus.A1800593


Measurement of a soil-water characteristic curve and unsaturated permeability using the evaporation method and the chilled-mirror method


Author(s):  Alfrendo Satyanaga, Harianto Rahardjo, Zhe Hao Koh, Haneena Mohamed

Affiliation(s):  School of Civil and Environmental Engineering, Nanyang Technological University, Singapore 639798, Singapore

Corresponding email(s):   chrahardjo@ntu.edu.sg

Key Words:  Evaporation method, Dew point method, Soil-water characteristic curve, Unsaturated permeability


Alfrendo Satyanaga, Harianto Rahardjo, Zhe Hao Koh, Haneena Mohamed. Measurement of a soil-water characteristic curve and unsaturated permeability using the evaporation method and the chilled-mirror method[J]. Journal of Zhejiang University Science A, 2019, 20(5): 368-374.

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author="Alfrendo Satyanaga, Harianto Rahardjo, Zhe Hao Koh, Haneena Mohamed",
journal="Journal of Zhejiang University Science A",
volume="20",
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pages="368-374",
year="2019",
publisher="Zhejiang University Press & Springer",
doi="10.1631/jzus.A1800593"
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%T Measurement of a soil-water characteristic curve and unsaturated permeability using the evaporation method and the chilled-mirror method
%A Alfrendo Satyanaga
%A Harianto Rahardjo
%A Zhe Hao Koh
%A Haneena Mohamed
%J Journal of Zhejiang University SCIENCE A
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%P 368-374
%@ 1673-565X
%D 2019
%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.A1800593

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T1 - Measurement of a soil-water characteristic curve and unsaturated permeability using the evaporation method and the chilled-mirror method
A1 - Alfrendo Satyanaga
A1 - Harianto Rahardjo
A1 - Zhe Hao Koh
A1 - Haneena Mohamed
J0 - Journal of Zhejiang University Science A
VL - 20
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SP - 368
EP - 374
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PB - Zhejiang University Press & Springer
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DOI - 10.1631/jzus.A1800593


Abstract: 
Fredlund and Rahardjo indicated that the behavior of unsaturated soil is significantly dependent on its soil-water characteristic curve (SWCC). There are many conventional methods for determining SWCC. Tempe and pressure plate apparatuses are commonly utilized in the laboratory to measure it. A Tempe cell is used to generate SWCC up to 100 kPa since it is provided with 1 bar high air-entry disc. A pressure plate cell (provided with a 5 or 15 bar high air-entry ceramic disc) is used to establish SWCC at suction ranges from 100 to 1500 kPa in combination with SWCC tests using the Tempe cell. These methods are known to be reliable for SWCC determination; however, they are tedious and time consuming.

The manuscript deals with a topic of considerable interest to geotechnical engineers who encounter problems that involve unsaturated soils. The Authors attempt to address one of the key concerns related to the measurement and use of soil-water characteristic curves, SWCC, namely, the length of time required for the laboratory measurement of the relationship between the amount of water in the soil and soil suction. The study involves the testing of three soil mixes with slight differences in their air-entry values. The manuscript is of interest to the geotechnical engineering profession.

综合蒸发法和冷镜露点法测量水-土特征曲线和非饱和渗透系数

目的:综合使用HYPROP和WP4C两种仪器,探索 采用蒸发法和冷镜露点法测量大吸力范围的水-土特征曲线,并采用收缩曲线对土体变形进行修正.
方法:1. 采用HYPROP仪器,在0~100 kPa吸力范围内测量土体的水-土特征曲线. 2. 当吸力大于600 kPa时,采用WP4C仪器,测量土体的水-土特征曲线. 3. 采用传统张力仪吸力板仪器,在0~500 kPa吸力范围内测量土体的水-土特征曲线. 4. 采用Satyanaga et al. (2017)公式,对实验数据进行拟合. 5. 采用HYPROP仪器直接测量土体的非饱和渗透系数. 6. 采用蒸发法,获取干缩曲线.
结论:1. 采用Satyanaga et al. (2017)公式,对实验数据进行拟合,拟合参数直接关联到进气值、拐点及方差.拟合结果显示,不同仪器所收集的水-土特征曲线的数据相互吻合,为水-土特征曲线的实验测量提供了更大的吸力范围. 2. 采用HYPROP仪器测量的非饱和渗透系数和采用传统改装的非饱和三轴实验数据基本吻合,因此,HYPROP可以 作为在低吸力范围内(<100 kPa)测量非饱和渗透系数的有效仪器. 3. 当进气值小于100 kPa 或者大于500 kPa时,综合采用HYPROP和WP4C可以有效缩短实验周期.

关键词:蒸发法;露点法;水-土特征曲线;非饱和渗透 系数

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