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Performance of geosynthetics reinforced cement fly ash gravel pile supporting embankment on completely weathered granite soil: a case study

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Document pages: 11 pages

Abstract: This paper introduces the full-scale test of high-speed railway embankment to study the performance of cement fly ash gravel (CFG) pile supported embankment on completely weathered granite (CDG) soil. The author compares the ground settlement, layer settlement and pile efficiency of CDG soil embankment strengthened only with geogrid and geogrid and CFG pile. The test results show that the effect of CFG pile supporting embankment on CDG soil is good. The soil arching effect of CFG pile reinforcement is effective, and increases significantly with the consolidation of surrounding soil. In addition, the increase of soil arching effect depends largely on the differential settlement between surrounding soil and pile. Five methods widely used in current designe used to calculate the pile efficacy. The prediction for pile efficacy by the Nordic method, BS8006, and its modified version is significantly higher than measured values. By contrast, the calculation by the EBGEO and CA model method is more approximate to the measured results in both the pattern and the value at the end of construction. Therefore, the adaptability of the EBGEO and CA model method outperformed that of the Nordic method, BS8006, and its modified version. Finally, in this case, the CA model method was recommended to estimate the pile efficacy of CFG pile-supported embankments built on CDG soils.

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