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Open AccessArticle

Embankment Displacement PLAXIS Simulation and Microstructural Behavior of Treated-Coal Gangue

by Xiaoyun Yang 1, Yan Zhang 1,2,* and Zhuhan Li 3
1
College of Energy and Transportation Engineering, Inner Mongolia Agricultural University, Hohhot 010018, China
2
Department of Civil & Environmental Engineering, University of Waterloo, Waterloo, ON N2L 3G1, Canada
3
Waterloo Collegiate Institute, Waterloo, ON N2L 3P2, Canada
*
Author to whom correspondence should be addressed.
Minerals 2020, 10(3), 218; https://doi.org/10.3390/min10030218
Received: 11 January 2020 / Revised: 24 February 2020 / Accepted: 26 February 2020 / Published: 28 February 2020
The purpose of this study is to investigate the displacement of coal gangue filling material in road construction and microstructural behavior of treated coal gangue by considering the environmental factors of aqueous solutions with different acidity. The displacement analysis of the coal gangue embankment model has been done by means of the finite element method PLAXIS. Furthermore, using the scanning electron microscope, the energy dispersive system, and the Raman spectrometer to analyze the microscopic mechanism in the view of microstructure, elements, the integrity of carbon structure and the stability of chemical bonds of coal gangue. The results show that the larger displacement of the treated coal gangue subgrade is within 4.0 m below the top of the subgrade, and the maximum displacement value is about 7 mm, which is less than the displacement of untreated coal gangue sample. While the treated A-CG and T-CG grain size, surface area and internal friction angle increase, the unstable carbon structure is destroyed, so its shear strength, compression performance, and consolidation effect are improved. S-CG particles are coated with Na-Si-Al gel, which enhances the density, viscosity and shear strength, thus ensuring the stability of the coal gangue subgrade. The treated coal gangue subgrade slope foot displacement, boundary shear stress and safety factor are all meet the specification requirements. View Full-Text
Keywords: coal gangue; embankment; displacement; PLAXIS; SEM; EDS; Raman coal gangue; embankment; displacement; PLAXIS; SEM; EDS; Raman
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Yang, X.; Zhang, Y.; Li, Z. Embankment Displacement PLAXIS Simulation and Microstructural Behavior of Treated-Coal Gangue. Minerals 2020, 10, 218.

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