- ISSN 0258-2724
- CN 51-1277/U
- EI Compendex
- Scopus
- Indexed by Core Journals of China, Chinese S&T Journal Citation Reports
- Chinese S&T Journal Citation Reports
- Chinese Science Citation Database
| Citation: | JING Guoqing, CHENG Yan, LIU Guixian. Influence of Number of Pebble Fracture Surfaces on Direct Shear Properties of Aggregates[J]. Journal of Southwest Jiaotong University, 2026, 61(1): 111-116. doi: 10.3969/j.issn.0258-2724.20240161
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In order to investigate the influence of the number of ballast particle fracture surfaces on the direct shear performance of the ballast bed, pebbles were crushed to obtain ballast aggregates with different numbers of fracture surfaces. Direct shear tests were carried out under different vertical stresses to obtain the stress–strain relationship and deformation characteristics of ballast aggregates. Based on formula calculation, the variation laws of peak shear strength and internal friction angle of ballast aggregates with vertical stress were obtained. The results show that, in terms of strength characteristics, when the number of fracture surfaces is 0, 1, 2, and 3, the shear strength and internal friction angle of ballast aggregates under the same vertical stress increase with the number of fracture surfaces. The shear strength increases by 14.7%–25.6%, 12.2%–27.4%, and 6.0%–10.1%, respectively. In terms of deformation characteristics, the shear shrinkage of ballast aggregates increases with fracture surface number, with a maximum increase of 76.4%, while the shear dilation decreases with a maximum decrease of 20.8%.
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