Research Article
Investigation on Dynamic Stability of Cement-Stabilized Expansive Soil Subgrades Subjected to Repeated Heavy-Haul Train Loads
| Category | σd (kPa) | Frequency (Hz) | Critical dynamic stress (kPa) | Mean value (kPa) |
| Virgin expansive soil | 30 | 1 | 22.3–31.5 | 26.90 | 60 | 1 | 28.6–34.9 | 31.75 | 30 | 5 | 21.6–30.8 | 26.20 | 60 | 5 | 27.2–33.7 | 30.45 |
| Expansive soil improved with 3% cement content | 15 | 1 | 151.2–185.7 | 168.45 | 30 | 1 | 157.5–203.5 | 180.50 | 60 | 1 | 182.3–233.1 | 207.70 | 15 | 5 | 148.8–181.4 | 165.10 | 30 | 5 | 152.3–200.1 | 176.20 | 60 | 5 | 180.6–229.6 | 205.10 |
| Expansive soil improved with 5% cement content | 15 | 1 | 142.5–208.1 | 175.30 | 30 | 1 | 148.3–233.5 | 190.90 | 60 | 1 | 202.5–249.7 | 226.10 | 15 | 5 | 147.8–199.6 | 173.70 | 30 | 5 | 145.6–231.7 | 188.65 | 60 | 5 | 201.5–246.2 | 223.85 |
| Group A filling | 15 | 1 | 100.0–125.2 | 112.6 | 30 | 1 | 100.1–125.2 | 112.7 | 60 | 1 | 125.1–150.6 | 137.9 |
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