摘要
以桩的长径比l/d、桩间距与桩径之比s/d、注浆加固体厚度h为因素,以单桩极限承载力Qu与某一荷载下的桩顶沉降Sp为评价指标,设计L9(34)正交试验方案,采用有限元法进行了桩端后注浆对单桩承载性状的作用效应研究,得出各因素作用效应的重要性次序和作用规律。研究表明,无论对桩基承载力还是对桩基沉降,桩间距与桩径之比都是最重要的影响因素,s/d较大时采用桩端后注浆来提高桩基承载力,减小桩基沉降,效果更显著;桩端后注浆使桩的端阻增大,承载性状改变,由摩擦桩逐渐过度为端承摩擦桩、摩擦端承桩或端承桩。
The orthogonal test L9(34) program is designed by taking slenderness ratio of piles l/d, ratio of pile spacing to pile diameter s/d, thickness of grouting body h as factors and the ultimate load-bearing capacity of single pile Qu and settlement of pile top under a load Sp as inspection parameters. The finite element method is used to analyze load-bearing behavior of single pile with post grouting at pile tip, and then order of factors and effect rules are got. The results show that the ratio of pile spacing to pile diameter s/d is the most important factor for bearing capacity or settlement of pile. When the s/d is larger, the effect of post grouting at pile tip on the increase in bearing capacity and the reduction in settlement of pile is more obvious. The post-grouting at pile tip can increase pile tip resistance and change the bearing behavior of pile gradually from the friction pile into the end bearing friction pile, friction end bearing pile, or end bearing pile.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2014年第S2期267-271,共5页
Rock and Soil Mechanics
基金
教育部"长江学者和创新团队发展计划"创新团队项目(No.IRT1067)
关键词
后注浆
桩基
承载力
沉降
post-grouting
pile foundation
bearing capacity
settlement
