P-Y CURVE OF SMALL-SPACED ROW PILES SUBJECTED TO LATERAL LOADS IN MARINE CLAY

Runze Xue ； Shean Bie ； Linlin Guo

《Journal of Marine Science and Technology》 28卷2期 (2020/04) Pp. 105-119

https://doi.org/10.6119/JMST.202004_28(2).0004

摘要

Newly proposed pile wall frame structures (PWFSs), notably with small-spaced row piles, have great potential for cofferdams of artificial islands applied for oil recovery in shallow seas. Studies have been called to analyze the bearing performance of small-spaced row piles subjected to lateral loads. A numerical investigation of laterally loaded row piles with small pile spacing was conducted to achieve a fitted algebraic expression of the P-Y curve. Significantly different from the hyperbolic P-Y curves of a single pile reported in other studies, the P-Y curve of small-spaced row piles is similar to an elastic-perfectly plastic curve, which simply depends on the ultimate lateral bearing capacity of piles (P_u) and initial slope of curves (K_i). Parametric studies have revealed that P_u and K_i values are affected by pile spacing, depth, untrained shear strength of soil, and relative soil-pile rigidity. Algebraic expression of the P-Y curve could be employed for the subgrade reaction method and be effectively used in predicting the behavior of small-spaced row piles, such as PWFSs.

關鍵字

row piles ； lateral load ； small pile spacing ； finite element analysis