The Soil-Water Characteristic Curve of Unsaturated Tropical Residual Soil

Soft Soil Engineering International Conference 2015

Yusof, M.F.^1 ; Setapa, A.S.^1 ; Tajudin, S.A.A.^3 ; Madun, A.^1,2 ; Abidin, M.H.Z.^1,2 ; Marto, A.^2

Research Center for Soft Soil, Universiti Tun Hussein Onn Malaysia, Batu Pahat Johor

81310, Malaysia^1

Faculty of Civil Engineering, Universiti Teknologi Malaysia, Skudai, Johor

81310, Malaysia^2

Faculty of Civil and Environmental Engineering, Universiti Tun Hussein Onn Malaysia, Batu Pahat Johor

86400, Malaysia^3

关键词: Plasticity indices;    Pressure plate extractor;    Residual matric suction;    Soil classification;    Soil-water characteristic curve;    Tropical residual soils;    Undisturbed soils;    Unsaturated soil;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/136/1/012013/pdf
DOI  :  10.1088/1757-899X/136/1/012013

来源: IOP

【 摘 要 】

This study was conducted to determine the SWCC of unsaturated tropical residual soil in Kuala Lumpur, Malaysia. Undisturbed soil samples at five locations of high-risk slopes area were taken at a depth of 0.5 m using block sampler. In the determination of the SWCC, the pressure plate extractor with the capacity of 1500 kN/m2 has been used. The index properties of the soil such as natural moisture content, Atterberg limits, specific gravity, and soil classification are performed according to BS 1377: Part 2: 1990. The results of index properties show that the natural moisture content of the soil is between 36% to 46%, the plasticity index is between 10% - 26%, the specific gravity is between 2.51 - 2.61 and the soils is classified as silty organic clay of low plasticity. The SWCC data from the pressure plate extractor have been fitted with the Fredlund and Xing equation. The results show that the air entry value and residual matric suction for residual soils are in the range of 17 kN/m2 to 24 kN/m2 and 145 kN/m2 to 225 kN/m2 respectively. From the fitting curve, it is found that the average value of the Fredlund and Xing parameters such as a, n and m are in the range of 0.24-0.299, 1.7-4.8 and 0.142-0.440 respectively.