Influence of isosceles trapezoid cross-section on the reinforcement effect of stabilizing piles: Fid-Bau Portal

Influence of isosceles trapezoid cross-section on the reinforcement effect of stabilizing piles

Li, Changdong / Liu, Xinwang / Liu, Qingtao / Liu, Tao

Abstract The paper conducts the study on the influence of isosceles trapezoid cross section on the reinforcement effect of stabilizing piles by employing the numerical modeling approach. On the basis of soil arching theory with end-bearing soil arching and friction soil arching, the modified mechanical model for the arbitrary isosceles trapezoid cross-section piles was proposed. The impacts of different slope ratios of the sidewall of the isosceles trapezoid cross-section piles on the displacement and load sharing of driving force were examined utilizing the explicit finite-difference software FLAC3D. The result of displacement contour graphs indicates that the stabilizing piles with trapezoid cross-section are better capable of resisting the deformation under the action of driving force. The logarithmic function between the load sharing percentage of end-bearing soil arching and slope ratio, and power function between the load sharing percentage of the friction soil arching and slope ratio were established for inner isosceles trapezoid crosssection piles. Similarly, the power function between the load sharing percentage of end-bearing soil arching and slope ratio was proposed for outer isosceles trapezoid cross-section piles. Furthermore, the reaction of soil arching on the stabilizing piles in view of the stress distribution discipline around piles was investigated. The result shows that the maximum vertical stress occurs in the back corners of stabilizing piles; consequently, the strength and rigidity of the back corners of stabilizing piles should be strengthened to resist the concentrated stress.