水平荷载作用下超长群桩效应数值分析  

NUMERICAL ANALYSIS OF PILE-GROUP EFFECT FOR SUPER-LONG PILE GROUP UNDER HORIZONTAL LOAD

作　　者：苏云迁 姚文娟[1] 

机构地区：[1]上海大学土木工程系,上海200444

出　　处：《建筑技术》2017年第1期13-16,共4页Architecture Technology

基　　金：国家自然科学基金资助项目(11272200)

摘　　要：通过数值模型模拟多种工况算例,研究了桩顶约束条件、桩距、桩数、桩长以及土内摩擦角等因素对群桩效应的影响。结果表明桩顶固接时的群桩效应较桩顶铰接时强;桩距增大,桩数减小,桩长减短及土内摩擦角的减小均使群桩效应减弱,其中土内摩擦角对群桩效应的影响较小。水平荷载作用下超长群桩的临界桩距在桩顶铰接时约为12D,桩顶固接时约为15D,远大于普通桩。超长桩的群桩效应强于普通桩。The effects of constraint conditions of pile-top, pile spacing, number of piles, pile length and the soil＇s angle of internal friction on pile-group effect are analyzed by simulating a variety of cases. The results show that the pile-group effect of piles with top hinged is greater than those with top fixed. Pile-group effect weakens with the decrease of number of piles, pile length and soil＇s angle of internal friction and the increase of pile spacing. Among them, any change in the soil＇s angle of internal friction has a small influence on the pile-group effect. The critical pile spacing of super- long pile group under horizontal load is 12D when pile-top is hinged and 15D when pile-top is fixed, which is much larger than the common piles. With other parameters unchanged, the pile-group effect of super-long piles is greater than that of common piles.

关 键 词：超长群桩 水平荷载 群桩效应 

分 类 号：TU473.1[建筑科学—结构工程]