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1. Fouling materials in ballast accumulate from abraded or broken ballast, spilled materials, and drainage. Proper ballast gradation provides void space for fouling storage and drainage. 2. Subballast refers to the granular layer between ballast and subgrade. It distributes loads, reduces subgrade stresses, provides drainage and separation from subgrade. Recent improvements include geosynthetics and hot-mix asphalt underlayment. 3. Common failures in fine-grained subgrades are cumulative plastic deform

Author

EDEN2203

Language

EN