ORIGINAL RESEARCH article
Front. Earth Sci.
Sec. Geohazards and Georisks
Volume 13 - 2025 | doi: 10.3389/feart.2025.1608064
This article is part of the Research TopicMonitoring, Early Warning and Mitigation of Natural and Engineered Slopes – Volume VView all 4 articles
Study on mechanical properties of solidified silt from waste rock powder and stability of subgrade slope
Provisionally accepted
- 1Ludong University, Yantai, China
- 2Ocean University of China, Qingdao, Shandong Province, China
- 3China Construction Infrastructure Corp., Ltd, Beijing, China
- 4Shandong hi-speed construction management group Co.ltd, Jinan, China
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Huangfan District silt exhibits discontinuous grading, low structural integrity, and insufficient binder content, failing to meet traffic subgrade specifications. This study employs alkali-activated basalt powder and slag (solid wastes) to form geopolymers for silt stabilization, analyzing stabilized soil subgrade slope stability. Key findings: (1) Alkali-activated basalt-slag synergy enhances mutual hydration, producing N-A-S-H and C-A-S-H cementitious gels. (2) Geopolymer content positively correlates with compressive strength, peaking at 20% dosage (2.74 MPa) -a 30.4-fold increase over natural silt, exceeding specification requirements by 10.96-fold. (3) Shear strength increases with vertical pressure and additives (NaOH, Na₂SiO₃, slag), showing significantly improved internal friction angle and cohesion versus natural silt. (4) With the increase of the content of geopolymer in solidified soil, the maximum vertical displacement of the roadbed surface and the displacement of the slope gradually decrease. The stress is mainly concentrated in the tire grounding area and gradually decays along the depth direction. The vertical stress values at other positions of the road slope are maintained at a low level.
Keywords: Subgrade slope, geopolymer, slope stability, Solidified silt, Reinforced silt
Received: 08 Apr 2025; Accepted: 26 May 2025.
Copyright: © 2025 Wang, Lu, Chen, LI, Tian, Lin, Meng and Zhang. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
* Correspondence: Wei Lu, Ocean University of China, Qingdao, 266003, Shandong Province, China
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