输电塔基础斜桩非线性p-y曲线

为了解黏性土中斜桩对侧向荷载作用的响应规律,利用非线性p-y(土抗力-挠度)曲线法研究了斜桩特性.基于试验得到的斜桩土抗力分布曲线,将斜桩理想化为梁单元,土体离散为弹塑性弹簧单元,通过自编计算机程序对斜桩非线性p-y曲线进行了计算和分析.结果表明:计算得到的p-y曲线与试验结果吻合较好,轴向荷载引起的负斜桩沉降小于正斜桩;在相同侧向荷载作用下,负斜桩桩身挠度和内力均小于正斜桩;负斜桩具有侧向承载力大而变形小的工程特性,工程设计应尽量采用负斜桩布置形式.

Nonlinear p-y curve for batter piles in foundation of transmission towers

The nonlinear p-y (load-deflection) curve method was employed to analyze the properties of batter piles in order to understand the response of batter piles in cohesive soil to lateral loads. Based on the distribution curves of soil resistance of batter piles in tests, the nonlinear p-y curve method for batter piles was developed and analyzed using a computer program in which the piles were idealized as beam elements and the soil as elasto-plastic spring elements. The results show that the calculated results of p-y curves agree with the test ones. The settlement of negative batter piles induced by the axial loads is smaller than that of the positive batter piles. The deflection and internal force of the negative batter piles are smaller than those of the positive batter piles under the same lateral loads. The negative batter piles have higher lateral bearing capacity and relatively smaller deformation compared with the positive batter piles. Accordingly, the negative batter piles should be employed as much as possible in the design of projects.