灌注桩孔壁粗糙度现场试验研究  

Field Study of Wall Roughness of Bored Pile

作　　者：杨砚宗[1,2] 赵春风[1,2] 鲁嘉 

机构地区：[1]同济大学岩土及地下工程教育部重点实验室,上海200092 [2]同济大学地下建筑与工程系,上海200092 [3]浙江建设职业技术学院建筑工程系,杭州311231

出　　处：《路基工程》2011年第5期80-82,共3页Subgrade Engineering

基　　金：国家自然科学基金项目(40972180);上海市重点学科建设项目(B308)

摘　　要：结合常州高架桥一期工程现场成孔实测数据,探讨分层土灌注桩孔壁粗糙度的影响因素,结果表明:常规钻机采用单腰带钻头,有利于形成锯齿形的孔壁,从而获得较大孔壁粗糙度;旋挖机采用旋转挖掘,回转钻进成孔,形成孔壁较光滑,粗糙度较小;在成孔机具相同的情况下,孔壁粗糙度在砂土中相对较大,在粘性土中相对较小,并随钻孔深度增大,土层稳定性增加,粗糙度逐渐呈减小趋势,粗糙度随时间增长不明显。Combined with the measured data of cast-in-place pile in the first-stage construction of Changzhou flyover crossing,the influencing factors of wall roughness of bored pile in layered soil are discussed in this paper.The results show that conventional drill machine with single-belt bit is favorable to form saw-shaped wall and thus get larger roughness;while rotary drilling machine adopts rotary boring to form smooth wall with smaller roughness.Under the same conditions of boring machine,wall roughness is relatively larger in sandy soil and smaller in clay soil,which will gradually decreased with drilling depth increased and soil stability improved.Roughness will not change significantly with time.

关 键 词：灌注桩 孔壁 粗糙度 土层性质 

分 类 号：TU473.14[建筑科学—结构工程]