孔壁粗糙度对深嵌岩桩承载特性的影响  

Influence of Hole Side Roughness on Bearing Characteristic of Deep Rock-socketed Pile

作　　者：龚成中[1,2] 龚维明[1] 何春林[2] 戴国亮[1] 

机构地区：[1]东南大学土木工程学院,江苏南京210096 [2]淮阴工学院建筑工程学院,江苏淮安223001

出　　处：《中国公路学报》2011年第2期56-61,共6页China Journal of Highway and Transport

基　　金："十一五"国家科技支撑计划项目(2008BAG07B01);山东省交通厅科技项目(2010Y-3)

摘　　要：为了明确孔壁粗糙度对深嵌岩桩承载特性的影响,采用室内模型试验方法,通过室内5组嵌岩桩的试验结果,分析了深嵌岩桩在桩端存在沉渣和密实2种情况下孔壁粗糙度因子对桩顶极限承载力、桩侧摩阻力和桩端阻力的影响。结果表明:粗糙孔壁对提高桩基的极限承载力是非常有利的,且桩端存在沉渣时,提高效果更为明显;在软岩地区,孔壁粗糙度对极限承载力的贡献并不是无限增长的,特别是在桩端存在沉渣的情况下,随着孔壁粗糙度的增大,极限承载力还有可能出现下降的趋势;孔壁粗糙度对桩端阻力也有一定影响,孔壁粗糙度大的桩,其桩端阻力发挥作用所需要的位移相对较小。In order to study the influence of hole side roughness on bearing characteristics of deep rock-socketed pile,using the results of five group rock-socketed piles by indoor model test,the influences of hole side roughness factor on ultimate bearing capacity of pile top,the frictional resistance of pile side and resistance of pile tip were analyzed with sediment and compaction at deep rock-socketed pile tip.The result shows that the rough hole side is very beneficial to improve the ultimate bearing capacity of pile foundation.When the pile tips have sediment,the effects are more obvious.The improvement of ultimate bearing capacity contribution caused by roughness is not endless in soft rock area.Especially in the case of sediment at pile tip,as the hole side roughness increases,the ultimate bearing capacity may also decline.Hole side roughness also has certain influence on pile tip resistance.The larger the hole side roughness is,the smaller the displacement related to pile tip resistance is.

关 键 词：桥梁工程 深嵌岩桩 模型试验 承载特性 孔壁粗糙度 桩侧摩阻力 

分 类 号：U443.15[建筑科学—桥梁与隧道工程]