桩端桩侧后注浆灌注桩竖向承载性能有限元分析  

Finite Element Analysis on Vertical Bearing Capacity of Bored Pile with Pile-toe,Pile-shaft and Post-grouting

作　　者：郑爱荣[1] 肖大平[2] 诸葛爱军[1] 陈举[1] 

机构地区：[1]中交天津港湾工程研究院有限公司港口岩土工程技术交通行业重点实验室天津市港口岩土工程技术重点实验室,天津300222 [2]中国建筑科学研究院,北京100013

出　　处：《中国港湾建设》2011年第1期27-31,共5页China Harbour Engineering

摘　　要：在现场试桩试验的基础上,考虑土体的小应变刚度,应用Plaxis程序中的小应变硬化土模型,对桩端桩侧联合后注浆灌注桩的竖向承载性能进行有限元分析。研究表明:有限元分析桩土作用时,应充分考虑土体的小应变刚度;灌注桩注浆后,桩土界面条件改善,桩侧摩阻力提高明显,相对位移减小;沉渣固化和桩端持力层强度的提高,使得桩端阻力明显增大并且发挥提前,可以在较小的桩端位移下发挥较大的桩端阻力,减少了桩体沉降量,提高了承载力,改善了灌注桩的承载性能。Based on static load test results,with consideration of the small-strain stiffness characteristic of soils the bearing capacity of bored piles with pile-toe and pile-shaft post-grouting have been analyzed using HS-small model of Plaxis program.The analyses reveal that the small-strain stiffness of soil is not negligible in analyzing pile and soil interaction;with post-grouting,the interface between pile and surrounding soil were strengthened and the relative sliding displacement in between was reduced,end resistance of pile was enhanced and could be mobilized at earlier stage with smaller sliding displacement.As a result,the performance of bored pile was improved with increased bearing capacity and reduced settlement.

关 键 词：灌注桩 后注浆 承载性能 有限元分析 小应变硬化土模型 

分 类 号：TU443[建筑科学—岩土工程]