Abstract
With a large number of applications of conventional technique for geosynthetic-reinforced and pile-supported (GRPS) embankment (called CT embankment), many deficiencies have been exposed. In view of the deficiencies, an improved technique, fixed-geosynthetic-reinforced and pile-supported embankment (called FGT embankment), is developed. To investigate the performance of the FGT embankment, the comparison analyses and parametric studies are conducted by Finite Element Method (FEM). The influencing factors investigated include elastic modulus of soil, tensile stiffness of geosynthetics, pile length, pile spacing, and pile elastic modulus. In addition, the cost evaluation for the FGT embankment and CT embankment is also made. The results show that the FGT embankment can significantly reduce the settlement and differential settlement, enhance the stability, and provide an economical and effective measure for the construction of high embankment at the bridge approach.
Highlights
With a large number of applications of conventional technique for geosynthetic-reinforced and pile-supported (GRPS) embankment, many deficiencies have been exposed [1,2,3]
The differential settlement in particular is still great when using the CT embankment at the bridge approach. This differential settlement could be attributed to the stiffness difference between the bridge abutment and bridge approach embankment [4,5,6]
In the FGT embankment, the geosynthetic is fixed on the pile caps, and this fixed system is comprised of a steel bar fulcrum and concrete fixed top
Summary
With a large number of applications of conventional technique for geosynthetic-reinforced and pile-supported (GRPS) embankment (called CT embankment), many deficiencies have been exposed [1,2,3]. The differential settlement in particular is still great when using the CT embankment at the bridge approach. A small differential settlement can produce a significant vehicle bump at the end of the bridge and this vehicle bump can lead to higher vehicle or bridge maintenance costs and discomfort to drivers and passengers [7, 8]. In view of these deficiencies, an improved technique, fixed-geosynthetic-reinforced and pile-supported embankment (called FGT embankment), is developed and introduced . In comparison with the CT embankment, the numerical analysis and cost evaluation are carried out to investigate the performance of FGT embankment in this study
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