摘要
由于成桩工艺不同,桩基的承载机理和工作性状会有明显差异。通过现场试验,研究了泥浆护壁钻孔灌注桩和全套管护壁钻孔灌注桩两种施工工艺对单桩竖向承载特性的影响,以及两种施工工艺对桩身轴力和桩侧阻力发挥的影响规律,同时分析了两种工艺导致的桩基承载力差异。结果表明:全套管全回转钻孔灌注桩的极限承载力是泥浆护壁钻孔桩的1.25倍,桩顶沉降前者比泥浆护壁钻孔桩减小了36%,全套管全回转桩的施工工艺相较于泥浆护壁钻孔灌注桩可以提供更高的桩基承载力。
Because of the difference of construction types of piling, the bearing mechanism and working properties of pile foundation would be apparently different.Through field tests,the influences of two construction techniques,i.e.slurry supporting cast-in-place pile and all casing supporting cast-in-place pile,on the vertical bearing characteristics of single pile and the influences of the two construction techniques on the axial force and lateral resistance of pile are studied.Meanwhile,the difference of bearing capacity of pile foundation caused by the two techniques is analyzed.The results show that the ultimate bearing capacity of the all casing and all rotation cast-in-place pile is1.25 times of that of the slurry supporting cast-in-place pile,the pile top settlement is36 % less than that of the slurry supporting cast-in-place pile and the construction technology of the all casing and all rotation cast-in- place pile can provide higher bearing capacity of the pile foundation than that of the slurry supporting cast-in-place pile.
作者
陈枝东
韩晓峰
张领帅
陆钊
陈锐
CHEN Zhidong;HAN Xiaofeng;ZHANG Lingshuai;LU Zhao;CHENRui(Shenzhen Hongyeji Geotechnical Science and Technology Co.,Ltd.,Geotechnical Engineering Design Institute,Shenzhen 518055,Guangdong,China;School of Civil and Environmental Engineering,Harbin Institute ofTechnology (Shenzhen ),Shenzhen 518055,Guangdong,China;Schoolof Civil and Environmental Engineering,University of Macao,Macao 999078,China)
出处
《路基工程》
2019年第4期89-95,共7页
Subgrade Engineering
基金
深圳市科技研发资金(JSGG20170413163030692)
关键词
泥浆护壁
全套管全回转
静载试验
承载特性
荷载-沉降
slurry supporting
all casing and all rotation
staticloading test
bearing characteristics
loading-settlement
