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| Parametric analysis of geosynthetic-reinforced pile-supported embankments using hybrid tests |
| RUI Rui1，HE Shikai1，LIU Hao2，PEI Yuhao1，CHEN Cheng1，ZHANG Lei1 |
| (1. School of Civil Engineering and Architecture，Wuhan University of Technology，Wuhan，Hubei 430070，China；
2. Huadong Branch of China Construction Second Engineering Bureau Co.，Ltd.，Shanghai 200135，China)
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Abstract There is a complex coupling effect among soil arching effect of the embankments，the tensile membrane effect of the geosynthetic reinforcement and the load bearing effect of the soft ground in geosynthetic-reinforced pile-supported(GRPS) embankments. Due to the evolution of soil arching with embankment loading and soil settlement between piles，the current calculation theories and methods are challenging to evaluate the whole process of load regulation and settlement stability of GRPS embankments. By introducing the technical idea of the hybrid test，a set of array multi trapdoor test devices and pile-soil foundation hybrid test methods were developed. The timely data exchange between the physical model of reinforced cushion embankment and the numerical model of pile-soil foundation was realized. Nine groups of hybrid tests with different embankment heights and tensile stiffness of reinforcement were carried out. The test results show that the established hybrid test method could well model the full component participation and full effect coupling working performance of GRPS embankments，greatly save the test cost and time，which provides an innovative evaluation method for the long-term bearing performance and settlement prediction of GRPS embankments. The concentric arch model can accurately evaluate the maximum soil arching effect of GRPS embankments. When the embankment height is low，the geosynthetic reinforcement with high tensile stiffness can improve the loading efficacy of piles. The geosynthetic reinforcement with high tensile stiffness can significantly reduce the settlement and the differential settlement between piles and soil under different embankment heights. With the increase of embankment height，the pile and soil efficacies with different reinforcement stiffness tend to be consistent，which reflects that the subgrade reaction coefficient method cannot reliably reflect the actual load-bearing mechanism of soil between piles.
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2022, Vol. 41 
