后压浆对桩基础承载特性影响的研究  

Study on the Influence of Post Grouting on the Bearing Behavior of Pile Foundation

作　　者：章韵[1] 张利鹏[2] 卢浩[2] 

机构地区：[1]陕西铁路工程职业技术学院,陕西渭南714000 [2]长安大学公路学院,陕西西安710064

出　　处：《甘肃科学学报》2017年第4期78-84,共7页Journal of Gansu Sciences

摘　　要：通过对桩周土层性质差异较大的两个试验区的4根试桩进行现场静载试验,研究不同桩端土注浆前后对桩基础承载力、沉降、桩端阻力、桩侧摩阻力和承载性状的影响。结果表明:密实圆砾土、硬塑粉质黏土桩端注浆后承载力分别提高5 000kN、2 000kN;密实圆砾土、硬塑粉质黏土桩端注浆后桩端阻力分别增长205.71%、182.25%;密实圆砾土、硬塑粉质黏土桩端注浆后桩端附近约7倍、9倍桩径长度的桩侧摩阻力得到增强;密实圆砾土桩端注浆前后桩基础承载特性发生改变,硬塑粉质黏土桩端注浆前后其摩擦桩承载性状不变。桩端土强度增强可提高桩基础承载力,桩端阻力增加对桩侧摩阻力有增强作用。Through the static load test of 4 test piles in the two experimental areas with different characteristics of the soil layer around the pile, this paper studies the influence of different pile end soil grouting on the bearing capacity, settlement, pile end resistance, pile side friction and bearing capacity of pile foundation.The analysis shows that the bearing capacity of compacted gravel soil and hard plastic silty clay is increased by 5 000 kN and 2 000 kN respectively; the pile tip resistance of compacted gravel soil and hard plastic silty clay was increased by 205.71%,182.25% respectively after grouting; pile side friction force which is about 7,9 times of pile diameter around pile tip after grouting of compacted gravel soil and hard plastic silty clay has been enhanced; The bearing characteristics of compacted gravel soil pile foundation before and after grouting are changed, while friction pile bearing characteristics of hard plastic silty clay pile tip before and after grouting are not changed.Enhanced pile tip soil can improve pile foundation bearing capacity; enhanced pile tip resistance can enhance pile side friction.

关 键 词：后压浆 承载力 沉降 桩端阻力 桩侧摩阻力 

分 类 号：U446[建筑科学—桥梁与隧道工程]