Experimental Investigation on the Deformation and Noncoaxial Characteristics of Fiber-Reinforced Aeolian Soil under Traffic Load
Publication: International Journal of Geomechanics
Volume 22, Issue 5
Abstract
The cumulative plastic deformation of a foundation associated with traffic loading causes subgrade instability, and eventually, failure of retaining structures. In the present study, hollow torsional shear tests were conducted on fiber-reinforced aeolian soil involving varying fiber contents, cyclic deviator stresses, cyclic shear stresses, and consolidation confining pressures using the Small-Strain Hollow Cylinder Apparatus, developed by GDS Instruments Ltd. (GDS SS-HCA). This enabled an investigation of the deformation characteristics and noncoaxial angle changes of fiber-reinforced aeolian soil under a heart-shaped stress path. The results indicate that fiber-reinforced soil deformation under cyclic loading involves axial (ɛz), radial (ɛr), circumferential (ɛθ), and shear (γzθ) strains, and deformation increases with increasing the cyclic number. The strain increases rapidly during the first 200 cycles and then gradually. The axial deformation decreases with increasing fiber content when the fiber content is less than 2‰ and increases when the content is more than 2‰. The plastic strain and total deformation decrease with increasing confining pressure but increase as the cyclic dynamic stress and cyclic shear stress amplitudes increase. Functional equations of the cumulative axial plastic strain and vibration numbers are proposed. The relationships between the model parameters, including the fiber content and cyclic torsional shear stress, are analyzed. The principal stress axis rotation causes variations between the major principal strain increment and the principal stress directions, representing the noncoaxial angle (β). The noncoaxial angle fluctuates during each loading cycle, exhibiting a V shape, for principal stress axis angles (ασ) from −90° to −45° and −45° to 30°, and decreasing at angles varying from 30° to 90°, with a maximum noncoaxial angle of approximately 30° per cycle.
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Acknowledgments
This work was supported by the Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, (Grant No. 2020007), the State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining & Technology (Grant No. SKLGDUEK1914), the National Natural Science Foundation of China (Grant Nos. 52104088 and 51978292), the Foundation of Liaoning Province Department of Education (Grant No. LJKZ0361), and Discipline Innovation Team of Liaoning Technical University (Grant No. LNTU20TD-08). The authors gratefully acknowledge the helpful comments made by the reviewers.
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Published In
International Journal of Geomechanics
Volume 22 • Issue 5 • May 2022
Copyright
© 2022 American Society of Civil Engineers.
History
Received: Aug 27, 2021
Accepted: Dec 21, 2021
Published online: Mar 9, 2022
Published in print: May 1, 2022
Discussion open until: Aug 9, 2022
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