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- Title
Study on influencing factors of unconfined penetration test based on orthogonal design.
- Authors
Yin, Siyu; Wu, Shaopeng; Liu, Mingbo; You, Zhilang
- Abstract
Tensile strength is one of the most important mechanical parameters controlling the development of cracks in loess plateau. The unconfined penetration test (UPT) is often used as an index for prediction of soil tensile strength properties. However, suffering the influence of the experiment condition, its uncertainty and sensitivity analysis to various experiment parameters was still unknown. Therefore, this study designed orthogonal tests and conducted the sensitivity analysis of influence factors (water content, dry density, steel disk (punch) diameter, height-diameter ratio, specimen preparation method, and loading rate) on the tensile strength of loess by using UPT. The statistical analysis of the test results indicated the order that affects tensile strength of the loess was water content, disk diameter, dry density, sample preparation method, height to diameter ratio, and loading rate respectively. The tensile strength of loess presented a tendency to increase at first and afterward to decrease as the increase of the punches diameter in UPT. The tensile strength reached a maximum value for a 24.72-mm disk diameter. According to the failure mode of the specimen, 12.3 to 20.5 times height-diameter ratio punches diameter range was considered appropriate. Furthermore, in the reconstituting specimen preparation method of disturbed loess, positive and reverse static pressure method was beneficial to the gain on the tensile strength. Maintaining a 1-mm/min loading rate, the variance of tensile strength was optimal. Moreover, the interactions of factors had significant effects on the tensile strength in UPT. The achieved results can provide the references and analytical analysis for standardizing UPT to measure the loess tensile strength.
- Publication
Arabian Journal of Geosciences, 2021, Vol 14, Issue 2, p1
- ISSN
1866-7511
- Publication type
Article
- DOI
10.1007/s12517-020-06361-z