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Study on Settlement of Railway Embankment on Deep Completely Decomposed Granite Ground by Centrifugal Model Tests

The settlement cntrol of high-speed railway is a key technology in embankment engineering. In order to reveal the engineering characteristics of the deep completely decomposed granite soil in Hainan east loop line, a passenger dedicated line, four groups of centrifuge model tests were conducted to study the settlement properties of the subsoils untreated, treated by dynamic compaction, and reinforced with cement-mixed piles, under the action of the embankment, especially the relationship between settlement and time, including the settlement during and post-construction. The results show that the Weibull model can describe the relationship between embankment settlement and time well, and that the post-construction settlements of the subsoil meet the requirements of the relevant code. Among the two foundation treatment measures, dynamic compaction is more effective than reinforcement with cement-mixed piles, and the pressure on the contact surface between embankment and subsoil was obviously different from the commonly used calculated values.