考虑P-Δ效应的承重阻滑桩有限差分解  

FINITE DIFFERENCE SOLUTION FOR LOAD-BEARING AND ANTI-SLIDE PILE WITH CONSIDERATION OF P–Δ EFFECT

作　　者：赵明华[1] 邬龙刚[1] 刘建华[1] 

机构地区：[1]湖南大学岩土工程研究所,长沙410082

出　　处：《工程力学》2008年第3期102-106,共5页Engineering Mechanics

基　　金：国家自然科学基金资助项目(50578060)

摘　　要：承重阻滑桩既需承受来自上部轴向与水平向的荷载作用,又要抵抗桩侧滑坡推力,具有承重与阻滑双重功能,其受力性状远比抗滑桩和平地上倾斜受荷桩复杂得多。综合考虑滑坡推力、地基系数、桩身侧摩阻力、桩身自重等影响因素,引入桩顶荷载对承重阻滑桩内力、位移的影响(P-?效应),推导得出不同特征桩段的微分方程,进而提出适用于承重阻滑桩内力及位移分析的有限差分解,并结合室内模型试验实测数据进行了分析比较,结果表明采用有限差分法分析承重阻滑桩内力及位移是可行的。The load-bearing and anti-slide pile has double function of bearing, the vertical and horizontal load from the superstructure as well as the landslide-thrust from the side of the pile foundation. The mechanical behavior of the pile is much more complex than that of anti-slide pile or simplex inclined-loading pile. Based on the consideration of affecting factors such as the landslide-thrust of slope, the foundation coefficient, the friction resistance of the pile shaft and the dead load of the pile, the effect induced by the load from the top of the pile to inner force and displacement （P-△ effect is discussed. The differential equation of the characteristic section of the pile is obtained, then the finite difference solution which fit for the inner force and displacement of the load-bearing and anti-slide pile is proposed. Comparing to the measured data of the model test in laboratory, the calculation result shows that it is feasible for adopting the finite difference solution to analyze the load-bearing and anti-slide pile.

关 键 词：桩基础 承重阻滑桩 P-△效应 内力计算 有限差分法 

分 类 号：TU473[建筑科学—结构工程] U443.15[建筑科学—土工工程]