不同地质条件下挤扩支盘桩与钻孔灌注桩轴向受压承载力对比分析  

Axial Bearing Capacity Analysis of Squeezed Branch Pile and Bores Piles under Different Geological Conditions

作　　者：冯燕[1] 刘汉章 王天佐[1] FENG Yan;LIU Han-zhang;WANG Tian-zuo(College of Architectural Engineering and Educational Arts,Hunan Vocational College of Electronic and Technology,Changsha,Hunan410000,China)

机构地区：[1]湖南电子科技职业学院建筑工程与教育艺术学院,湖南长沙410000

出　　处：《贵州工程应用技术学院学报》2022年第3期113-118,共6页Journal of Guizhou University Of Engineering Science

摘　　要：通过对两种不同地质条件下钻孔灌注桩和挤扩支盘桩单桩轴向受压承载力特征值进行计算,进一步通过慢速维持荷载的静载原位测试对两种地质下钻孔灌注桩和挤扩支盘桩逐级等量加载,并绘制Q~s曲线,进行数据分析。研究成果表明:在不同地质条件下挤扩支盘桩均能明显提高单桩轴向受压能力,其单桩轴向受压承载力特征值提高幅度约为30%~60%,具体幅值与地质情况及布盘土层等多项因素相关。通过对比可以发现,相较于普通钻孔灌注桩,在不同地质条件下挤扩支盘桩受压承载力更高,造价也更低,可将其广泛应用于房建、软基处理、电力行业、公路、高铁和城轨等建设。By calculating the characteristic values of axial bearing capacity of bored pile and squeezed branch pile under two different geological conditions,through the static load in-situ test of slow-speed mainte⁃nance load,the equal load of bored pile and cast-in-place pile under two kinds of geological conditions is car⁃ried out step by step,and the Q~s curve is drawn and then the data is analyzed.The results show that under different geological conditions,the axial compression capacity of single pile can be increased by 30%~60%,and the bearing capacity of single pile can be increased by 30%~60%,the specific amplitude is related to many factors,such as the geological conditions and the distribution of pan soil layers.Through comparison,it can be found that,compared with ordinary bored piles,under different geological conditions,the bearing ca⁃pacity of squeezed branch pile is higher and the construction cost is lower,it can be widely used in building construction,soft foundation treatment,power industry,highway,high-speed railway and urban rail construc⁃tion.

关 键 词：挤扩支盘桩 钻孔灌注桩 轴向受压承载力 

分 类 号：TU-022[建筑科学—建筑理论]