Research Article
Investigation on Dynamic Stability of Cement-Stabilized Expansive Soil Subgrades Subjected to Repeated Heavy-Haul Train Loads
Table 1
The physical and mechanical of virgin expansive soil and CSES.
| Category | Parameter | Natural soil sample | Cement content | 3% | 4% | 5% |
| Particle size distributions (%) | >0.075 mm | 5.4 | 20.5 | 21.1 | 23 | 0.075–0.005 mm | 50.3 | 52.2 | 55.8 | 55.0 | <0.005 mm | 44.3 | 27.3 | 23.1 | 22.0 |
| Swelling–shrinking characteristic | Free swelling ratio (%) | 66 | 32 | 28 | 23 | Swelling ratio with loading (25 kPa) | 6.8 | 0.1 | 0.06 | <0 | Swelling ratio with loading (50 kPa) | 6.7 | <0 | <0 | <0 | Expansion force (kPa) | 129 | 14 | 10 | 1 | Shrinkage coefficient | 0.91 | 0.73 | 0.62 | 0.52 | Plastic limit (%) | 10.2 | 10.2 | 11.9 | 11.2 |
| Strength index | Cohesive force (kPa) | 45 | 183 | 201 | 291 | Friction angle (°) | 21.4 | 24.6 | 33.2 | 35.5 | Unconfined compressive strength test (7 days) (kPa) | 44 | 866 | 1,018 | 1,170 |
| Water-related stability coefficient | Degree of compaction (0.90) | 0.18 | 0.81 | 0.84 | 0.83 | Degree of compaction (0.95) | 0.25 | 0.85 | 0.88 | 0.89 |
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