ORIGINAL RESEARCH
Strength Characteristic of Unsaturated Moraine
Soil at High-Plateau Airport
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1
School of Airport Engineering, Civil Aviation Flight University of China, Guanghan, 618307, China
2
School of Air Traffic Management, Civil Aviation Flight University of China, Guanghan, 618307, China
Submission date: 2023-08-21
Final revision date: 2023-10-03
Acceptance date: 2023-10-10
Online publication date: 2023-12-04
Publication date: 2024-01-22
Corresponding author
Jun Feng
School of Airport Engineering, Civil Aviation Flight University of China, Guanghan, 618307, China
Pol. J. Environ. Stud. 2024;33(2):1101-1109
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ABSTRACT
Triaxial tests were performed on samples of unsaturated moraine soil at a high-plateau airport of
China by using the unsaturated soil triaxial apparatus. In the tests, the matric suction and net confining
pressure were controlled. In the scheme of the tests, the matric suctions were controlled at 0 kPa,
50 kPa, 100 kPa and 200 kPa. The net confining pressures were controlled at 100 kPa, 200 kPa,
300 kPa and 400 kPa. The results showed that for the unsaturated moraine soil, c' and φ' increase
in the matric suction and their growth rates were similar. The relationship between volumetric strain
and net confining pressure showed that the specimens were in a state of dilatancy with a small net
confining pressure and the amount of dilatancy rapidly decreased and developed into a shear
shrinkage state with an increase in net confining pressure. The last amount of shrinkage was stable
at approximately 0.6%. Also, the soil suction characteristic curve for the studied soil was obtained
by the tests and the suction stress increased with the matric suction.