摘要
相对于传统的水平受荷桩基础和地下连续墙基础,桩-地下墙-锚杆组合基础(桩墙锚组合基础)能够提高基础的水平承载力,节省建筑材料并降低工程造价。文章通过开展室内模型试验,分析了水平荷载作用下桩墙锚组合基础的内力及变形规律,并与桩-地下墙组合基础进行对比,得到了桩墙锚组合基础的变形控制机制。结果表明:水平荷载作用下组合基础呈整体倾斜破坏;墙身弯矩远大于桩身弯矩,其值随加载等级的递增而逐渐增大,且最大值位置与弯矩峰值位置不变;随埋深、水平荷载的增加,墙侧土压力呈非线性变化,地下墙边侧土压力大于中间土压力,并且最大土压力出现在地下墙的中下部;锚杆的增设大幅提升了基础对水平荷载的抵抗能力,从而增加了基础的水平承载力。
Compared with the traditional horizontally loaded pile foundation and diaphragm wall foundation,the pile-underground wall-anchor combination foundation(hereinafter referred to as the pile-wall-anchor combination foundation)can increase the horizontal bearing capacity of the foundation and save building materials and reduce the project cost.This paper analyzes the internal force and deformation laws of the pile-wall-anchor combination foundation under horizontal load by carrying out indoor model tests.It also compares and analyzes the pile-wall combination foundation at the same time,obtaining the deformation control mechanism of the pile-wall-anchor combination foundation.The results of the study show that the composite foundation under horizontal load presents overall inclined failure.The bending moment of the wall is much larger than that of the pile.It can be seen that the bending moment of the pile wall gradually increases with the increase of the loading level,and the position of the maximum bending moment and the peak value of the bending moment remains unchanged.With the increase of buried depth and horizontal load,the side earth pressure of the wall presents a nonlinear change.The side earth pressure of the diaphragm wall is greater than the intermediate earth pressure,and the maximum earth pressure appears in the middle and lower part of the diaphragm wall.Comparing the foundation with the pile-wall combination foundation,it can be inferred that the addition of anchor rods can greatly increase the resistance of the foundation to horizontal loads,thereby increasing the horizontal bearing capacity of the foundation.
作者
魏焕卫
张兴丽
王震
刘丞
WEI Huanwei;ZHANG Xingli;WANG Zhen;LIU Cheng(School of Civil Engineering,Shandong Jianzhu University,Jinan 250101,China;Shandong Greentown Jingfeng Real Estate Construction Management Co.,Ltd.,Jinan 250100,China;Shandong Institute for Product Quality Inspection,Jinan 250102,China)
出处
《山东建筑大学学报》
2022年第1期23-32,70,共11页
Journal of Shandong Jianzhu University
基金
山东省自然科学基金项目(ZR2019MEE021)。
关键词
水平荷载
桩墙锚组合基础
模型试验
水平承载能力
horizontal load
pile-wall-anchor composite foundation
model test
horizontal bearing capacity
