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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 study the mechanical behaviors of the reaming miniature piles, five full-scale lateral bending tests were carried out on the micro-piles with different reaming parameters. The influence of reaming parameters on the bending moment and lateral displacement The results show that the obvious change of pile bending moment occurs before the first bending point of 20 D (pile diameter), and the maximum bending moment appears at the depth of 6 D. The lateral displacement of the pile tends to decrease with the increase of the buried depth, and the horizontal displacement mainly occurs within 10 D of the buried depth. After the reaming, the micro-pile is more easily deformed under the lateral load. The more loose the filler in the reaming, the larger the reaming diameter, the greater the lateral displacement of the pile. In the depth of 3 D ~ 4.5 D reaming depth, reaming depth has no significant effect on the lateral displacement of pile. The conclusions of the study lay the foundation for studying the reaming problem of miniature piles and provide references for the reaming technology of monolithic bridge abutment piles.