Effective Stress Analysis of Seismic Behaviors of Inclined Micropiles on Liquefiable Soils

Abstract eng:
Seismic performance of inclined micropiles on the liquefiable soils is a complex problem. The traditional analytical closed from solutions is often difficult to meet the need of seismic design of micropiles on liquefiable soils. Herein an effective stress analysis method using a multiple shear plasticity model and a concept of liquefaction front was used to investigate dynamic behaviors of micropiles on liquefiable soils. The numerical simulations for the micropile with inclination of 0°, 15°, 25° to the vertical and different motion intensity of sine wave and El Centro earthquake motion were presented to study the effects of independent variables on the deflections, bending moments, accelerations and pile-soil relative lateral displacement along buried micropile length. Moreover, the results were also further compared. The numerical predications show that stronger input motion intensity results in higher responses at the micropile head. The maximum amplitude of deflection is lower in the inclined micropile groups than in the vertical micropile groups. And the values of deflection and bending moments of micropiles, lateral displacements difference between the micropile and soil in liquefiable soils are much bigger than in non-liquefiable soils. The inclined micropiles behave smaller lateral displacements and accelerations at micropile head as compared to the vertical micropiles. Inclination of micropiles results in asymmetrical distribution among the micropile groups during earthquake. These results provide a reference for the seismic design of micropiles founded on liquefiable soils.

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