科研之友
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摘要
The load transfer mechanism of a geosynthetic-reinforced and pile-supported embankmentis is influenced by the interactions among embankment fill, bridging layer, piles and foundation soil. In this paper, an integrated method for calculating the loads carried by the pile and subsoil is developed based on the displacement compatibility principle, which takes the soil arching effect, tensioned membrane effect and pile-soil interaction into account. In the presented method, the magnitude of shear stress due to the arching action depends on the relative displacement within the embankment fill and the elastic-perfectly plastic stress-displacement response is considered, the tension and strain in the geosynthetic are obtained using the parabolic method, and the hyperbolic model is adopted to relate the negative and positive skin friction with differential settlement between pile and surrounding soil. The proposed method of determining the stress on the pile and subsoil provides a better agreement with the field measurement comparing to the existing analytical methods. In addition, a parametric study is conducted to evaluate the effects of several factors on the load transfer behavior, such as the mobilization coefficient of shear strength, cohesion and internal friction angle of embankment fill, pile spacing, and compressive modulus of subsoil. The results indict that the cohesion plays a more important role in transferring of load from soft subsoil to rigid piles than the internal friction angle of embankment fill. Additionally, different optimal pile spacings which lead to the maximum stress concentration ratio are found for different embankment heights.
