基于m法的长螺旋扩底桩桩侧地基反力试验研究  

Experimental Research on Foundation Reaction Force of Long Spiral Expanded Bottom Pile Based on m Method

作　　者：孔天明 梁海安[1] 程新俊 杨泽平[1] 刘超[1] 曹开伟 胡光阳[1] KONG Tianming;LIANG Haian;CHENG Xinjun;YANG Zeping;LIU Chao;CAO Kaiwei;HU Guangyang(East China University of Technology,Nanchang 330013,Jiangxi,China;Jiangxi Zhongheng Underground Space Technology Co.,Ltd.,Nanchang 330052,Jiangxi,China)

机构地区：[1]东华理工大学土木与建筑工程学院,江西南昌330013 [2]江西中恒地下空间科技有限公司,江西南昌330052

出　　处：《水力发电》2022年第6期113-118,共6页Water Power

基　　金：国家自然科学基金资助项目(52168045)。

摘　　要：长螺旋扩底桩作为一种新桩型,目前水平承载力设计通常按等直径灌注桩考虑,其桩身螺纹以及扩大头对桩身受力变形的影响尚未可知。为研究循环荷载作用下长螺旋扩底桩桩-土相互作用的规律,分别对长螺旋扩底桩、扩底桩、直桩进行了室内模型试验。结果表明,长螺旋扩底桩桩身受力变形与直桩有一定差异,其地基反力系数的比例系数m值随位移增加呈幂函数衰减;m法计算直桩比较合理,但用于计算长螺旋扩底桩有较大误差。As a new type of pile,the horizontal bearing capacity of long spiral expanded bottom pile is currently designed as a equal-diameter cast-in-place pile,but the effect of pile body thread and enlarged head on the deformation of pile body is unknown.In order to study the law of pile-soil interaction of long spiral expanded bottom pile under the action of cyclic loading,indoor model tests are carried out for the long spiral expanded bottom pile,the expanded bottom pile and the straight pile respectively.The results show that the stress and deformation of the long spiral expanded bottom pile is different from that of the straight pile,and the proportional coefficient m of the foundation reaction force coefficient attenuates as a power function with the increase of displacement.The long helical expanded bottom pile has a large error.The m method is more reasonable to calculate straight piles,but it has larger errors when used to calculate long spiral expanded bottom pile.

关 键 词：模型试验 长螺旋扩底桩 桩-土相互作用 循环荷载 线弹性地基反力法 比例系数 

分 类 号：TU473.1[建筑科学—结构工程]