路堤堆载作用下路基固结度对桥梁桩基影响分析

Analysis of the influence of roadbed consolidation degree on bridge pile foundation under embankment stacking

基于桥梁桩基旁侧路堤堆载的工况下,采用现场试验、数值模拟和理论分析相结合的方法对路基固结度及桥梁桩基内力、变形进行分析,通过现场段实测埋设测斜管、沉降板、分层沉降仪等测得桩基侧向、竖向水平位移。使用数值计算回归地层力学性质参数验证初始地层参数的准确合理性。结果显示:路堤堆载施工期及运营期均会使桥梁桩基发生侧向位移及沉降,最大位移位置在桩身埋深6 m~8 m位置;桩身弯矩在桩顶附近达到最大值,随后快速衰减至零值附近,然后至桩底趋于稳定。回归后的土层参数与初始参数相接近,表明初始参数具有合理性。

Based on the working conditions of pile embankment stacking next to the bridge pile foundation,this paper analyzes the consolidation degree of the roadbed,the internal force and deformation of the bridge pile foundation by combining field test,numerical simulation and theoretical analysis,and the lateral and vertical horizontal displacement of the pile foundation is measured by the actual measurement of the buried inclination measuring pipe,settlement plate and layered settlement instrument in the field section.The numerical calculation of the regression formation mechanical property parameters is used to verify the accuracy and rationality of the initial formation parameters.The results showed that the lateral displacement and settlement of the bridge pile foundation would occur during the construction and operation periods of the embankment stacking,and the maximum displacement position was 6 m~8 m deep in the pile body.The bending moment of the pile body reaches a maximum near the top of the pile,then rapidly decays to near zero,and then stabilizes at the bottom of the pile.The soil layer parameters after regression were close to the initial parameters,indicating that the initial parameters were reasonable.