水平周期荷载作用下支盘桩受力性状的模型试验  

Model test of bearing behaviors of squeezed and branch pile under horizontal periodic loading

作　　者：高笑娟[1] 李跃辉[1] 吕冰[1] 钟国华[1] 

机构地区：[1]河南科技大学土木工程学院,河南洛阳471023

出　　处：《煤田地质与勘探》2015年第3期72-76,共5页Coal Geology & Exploration

基　　金：河南省教育厅课题(2010B560005)

摘　　要：为了研究桩在水平动荷载作用下的受力和变形规律,自制了一套能施加动荷载的加载装置,并对两根承力盘位置不同的模型桩进行了水平动荷载试验,研究了桩顶所加荷载幅值、加载频率、承力盘的位置等因素对支盘桩桩身弯矩和桩侧土压力的影响规律。结果表明:随着桩顶荷载幅值的增加,桩身上部正弯矩和弯矩的最大值均呈现增大趋势,桩侧土中压力亦逐渐增大;随着加载频率的增大,桩身上部弯矩先变大,后又减小,土中压力一直呈增大趋势;承力盘位置靠上的桩在同样条件下桩身正弯矩和最大弯矩值较小,桩侧土中的压力也较小。A dynamic loading equipment was made to study the load bearing capacity and deformation law of model pile under periodic load. In this paper the horizontal periodic load tests of two model piles with different plate position were carried out in the self-made soil box. The influence of the load amplitude, loading frequency, position of plate on the pile section moment and soil pressure were researched. The results show that the moment in pile body and the maximum moment increase with the increasing of load amplitude, and the soil pressure also in-crease at the same time. With the increase of the loading frequency, the moment in pile body increases firstly but decreases later, and the soil pressure keeps increasing. For the two model piles with different plate position, the moment in pile body and the soil pressure of the pile with plate nearer pile top are less than that of the other pile. Those results may be used in the practical engineering.

关 键 词：周期荷载 支盘桩 模型试验 受力性状 加载频率 

分 类 号：TU473[建筑科学—结构工程]