Abstract
The removal of soil during scouring is crucial to the lateral resistance of piles in bridges of railways or highways. In this process, dilatancy of the interface soil induces variation in normal stress, which in turn influences the interface soil lateral resistance. Due to the lack of analysis in previous studies in terms of cohesionless soil state (i.e., relative density and stress level) in remaining soil after scouring, it is difficult to simulate the properties and behavior of interface soil. The objective of this study is to explain the change of the sand state at the compression interface after scouring, quantify the stress-strain characteristics of the pile during this period and eventually present the prediction p-y curves of the lateral service capacity. The state-dependent constitutive model for saturated sand is employed, combined with the 3D finite element simulation, and the state development of the remaining soil is exhibited. The enhancement of dilation and stress relief of the remaining shallow horizon eventually gives rise to the reduction of the lateral resistance. In addition, the remaining overburden soil surrounding the pile restricts the interface soil, enlarging the normal stress and strengthening the deep horizon. Then, the friction angle considered the influence of state-dependent changes is used to quantify the hyperbolic p-y curves.
Highlights
In order to cross rivers and oceans, bridges are widely employed in railways and highways [1,2]
The Variation of Pile Response Subjected to Scour
There is an evident impact of stress relief in the shallow horizon of remaining soil on the pile response after scouring as the stress state changes
Summary
In order to cross rivers and oceans, bridges are widely employed in railways and highways [1,2]. As the main foundation form of the bridge, the serviceability of the piles tends to be affected by a variety of working conditions. As a common form of erosion around the pile foundations, through the removal of the seabed soil around the pile, scour can reduce the pile embedded length. Receiving complex hydrodynamic loads (wave, current), the lateral service capacity of the piles dwindles by means of enhancing bending moment after scouring, and leads to the failure of the whole structures [3]. The lateral service capacity of the pile before and after scouring should be analyzed. A reasonable analysis method of the pile-soil interaction of the compression side is essential for the research
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