Effect of Cr on the performance of Fredlund and Xing (1994)'s equation in best fitting soil-water characteristic curve data

Shijun Wang; Wanwei Li; Ziyun Chen; Gang Tian; Guoliang Dai; Qian Zhai; Harianto Rahardjo

Results in Engineering (Mar 2022)

Effect of Cr on the performance of Fredlund and Xing (1994)'s equation in best fitting soil-water characteristic curve data

Shijun Wang,
Wanwei Li,
Ziyun Chen,
Gang Tian,
Guoliang Dai,
Qian Zhai,
Harianto Rahardjo

Affiliations

Shijun Wang: Division of Development, Gansu Electric Power Corporation, State Grid (Research Institute of Economy & Technology), Lanzhou, 730050, China; Key Laboratory for RC and PRC Structures of the Ministry of Education, Southeast University, Nanjing, 210096, China
Wanwei Li: Division of Development, Gansu Electric Power Corporation, State Grid (Research Institute of Economy & Technology), Lanzhou, 730050, China
Ziyun Chen: Division of Development, Gansu Electric Power Corporation, State Grid (Research Institute of Economy & Technology), Lanzhou, 730050, China
Gang Tian: Key Laboratory for RC and PRC Structures of the Ministry of Education, Southeast University, Nanjing, 210096, China
Guoliang Dai: Key Laboratory for RC and PRC Structures of the Ministry of Education, Southeast University, Nanjing, 210096, China
Qian Zhai: Key Laboratory for RC and PRC Structures of the Ministry of Education, Southeast University, Nanjing, 210096, China; Corresponding author.
Harianto Rahardjo: School of Civil and Environmental Engineering, Nanyang Technological University, Block N1, Nanyang Ave., Singapore, 639798, Singapore

Journal volume & issue: Vol. 13
p. 100373

Abstract

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Fredlund and Xing (1994)'s equation is one of most popular equations in best fitting the soil-water characteristic curve (SWCC) data. It is commonly considered that the parameters of the equation such as a, n and m are the fitting parameters and Cr is an input value, which is commonly recommended that Cr to be1500 kPa or 3000 kPa. Based on the analysis in this paper, it is observed that setting Cr to be equal to 1500 kPa or 3000 kPa may downgrade the performance of Fredlund and Xing (1994)'s equation in best fitting the SWCC data of soils with a high air-entry value (AEV). It is recommended the air-entry value (AEV) of the soil is roughly estimated before the best fitting process and set Cr to be 100 times of the estimated AEV for the best regression analysis.

Published in Results in Engineering

ISSN: 2590-1230 (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Technology
Website: https://www.journals.elsevier.com/results-in-engineering

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