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针对位于深厚淤泥地基上的高路堤桥台的冲孔灌注桩,进行了1.5 a的现场实测,测试了修筑承台前、修筑桥台期间、邻近过渡段的路基填土期间、过渡段的路基填土期间及跨梁修筑后的桩身应变和桩侧土体孔隙水压力,也测试了基桩的挠曲变形和桥台的倾斜变形,基于实测结果对基桩的受力变形性状进行研究。结果表明,桥台基桩在承受上部结构荷载以前就产生了压缩变形;在上部桥台和台后填土的共同作用下,桩身前后侧的轴向应变虽都表现为压应变,但应变值相差较大;台后路基填土完成后,桩身最大负弯矩出现在淤泥层浅部,最大正弯矩出现在软硬土层交界处,桥台发生较小倾斜;跨梁的修筑使桥台台身又恢复到竖直状态。
For the punched and filled piles with high embankment abutments on the deep silt foundation, a field test was carried out for 1.5 years. During the construction of the abutment, during the abutment construction and during the embankment filling near the transitional section, the embankment of the transition section During the filling period, the pile strain after straddle beam construction and the pore water pressure on the pile side were also tested. The deflection deformation of the pile and the abutment slope deformation were also tested. The force-deformation characteristics of the pile were studied based on the measured results . The results show that the abutment pile produces compressive deformation before being subjected to the superstructure loads. Under the joint action of the upper abutment and the backfill, the axial strain on the front and the back of the pile are both compressive but strain The maximum negative bending moment appears in the shallow part of the silt layer, the maximum positive moment appears in the junction of soft and hard soil, the bridge abutment with a small tilt; bridge construction So that abutment abutment Taiwan and restored to the vertical state.