摘要
为了研究扩孔微型桩的受力性能,对5根具有不同扩孔参数的微型桩进行了室内足尺侧向受荷试验,分析了扩孔参数对微型桩桩身弯矩和侧向位移的影响得出,明显的桩身弯矩变化主要发生在第一个反弯点20 D(桩径)之前,且最大弯矩值出现在埋深6 D处;不同扩孔参数对桩身弯矩影响不明显;桩身侧向位移随着埋深的增加呈逐渐减小的趋势,且水平位移主要发生在埋深10 D内;扩孔后,微型桩在侧向荷载作用下更易变形。扩孔内填料越松散,扩孔孔径越大,桩身侧向位移越大。在埋深3 D^4.5 D扩孔深度内,扩孔深度对桩身侧向位移影响不明显。研究所得结论为研究微型桩的扩孔问题打下基础,并为整体式桥台桥梁支承桩的扩孔技术提供借鉴。
In order to investigate the mechanical properties of micro-pile with predrilled oversize hole, indoor full-scale lateral loading experiments of micro-piles with different predrilled-hole parameters are carried out, while the effects of parameters on bending moment and lateral deformation of micro-piles are analyzed. The following conclusions can be drawn.. 1）the obvious change of bending moment mainly occurs before the first inflection point 20D （pile diameter）, and the maximum bending moment appears in the buried depth of 6D; 2） the influence of different predrilled-hole parameters on the bending moment is not obvious; 3） the lateral displacement gradually decreases with the increasing of buried depth, and the lateral displacement occurs mainly within the buried depth of 10D; 4） compared to non predrilled case, the micro-pile with predrilled oversize hole has larger deformation at the same lateral loading. The wider aperture and looser material compactness of predrilled hole increase the lateral displacement of micro-pile. In the range of 3D to 4. 5D, the increasing buried depth doesn＇t have obvious influence on lateral displacement of micro-pile. These conclusions will make contribution to solving problem of micro-pile with predrilled oversize hole and provide reference for predrilled-hole technology in integral abutment bridges. Key words, micro-pile with predrilled oversize hole;predrilled-hole parameter;bending moment ~ lateral displacement
出处
《公路》
北大核心
2015年第8期54-58,共5页
Highway
基金
国家自然科学基金项目
项目编号51278126
福建省自然科学基金项目
项目编号2013J01187
关键词
扩孔微型桩
扩孔参数
弯矩
侧向位移
研究
micro-pile with predrilled oversize hole
predrilled-hole parameter
bending moment
lateraldisplacement
