钻孔灌注桩后注浆的分析和探讨  

Discussion and Analysis on Post-Grouted Bored Piles

作　　者：刘伟伟[1] 巢斯[2] 

机构地区：[1]同济大学建筑工程系,上海200092 [2]同济大学建筑设计研究院,上海200092

出　　处：《结构工程师》2010年第6期84-88,共5页Structural Engineers

摘　　要：通过实测试验数据表明后注浆能够改善土层性质,提高单桩承载力,同等加荷下降低沉降值;但桩侧桩端联合注浆与仅桩端注浆对单桩承载力的提高幅度相当,桩侧注浆对侧摩阻力的影响离散性较大。后注浆桩的桩侧摩阻力极限值比未注浆的大,但在加荷过程中,多数土层仍会出现类似于未注浆土层的侧摩阻力软化现象。Through the field test,we got the following conclusions： post-grouting can improve the characteristic of the soil a round the bored pile,increase the bearing capacity and reduce the settlement;side-tip post-grouted bored pile and tip post-grouted bored pile increase the single pile bearing capacity equally;the influence of side grouting on side shear force is complex and discrete;the ultimate side shear of post-grouted pile is larger than ungrouted pile.During the process of static test,with the load increased,most layers of soil showed signs of strength softening.

关 键 词：桩侧桩端联合后注浆 桩端后注浆 桩侧摩阻力 

分 类 号：TU753.3[建筑科学—建筑技术科学]