深厚软土地基堆载预压对邻近桥梁桩基影响分析

Analysis on Influence of Heap Load Preloading on the Pile Foundation of Adjacent Bridges in Deep Soft Soil Foundation

以明珠湾大桥为背景,研究深厚软土地基差异堆载对邻近桥梁桩基偏移、桩体开裂的影响。采用理论计算、数值模拟和现场监测相结合的方法,分析4#墩桩基在原始差异堆载和优化差异堆载预压条件下的最大水平位移和最大桩身裂缝。结果表明:原始堆载差异量预压条件下的桩基最大水平位移不满足规范要求,而最大桩身裂缝满足规范要求;通过优化堆载差异量预压条件下的桩基最大水平位移及最大桩身裂缝均满足设计规范要求。研究结果可为类似深厚软土地基堆载预压提供理论支持和工程借鉴。

With the Mingzhu Bay Bridge as the background,the influence of differential stacking loads on deep soft soil foundations on the displacement of adjacent bridge piles and pile cracking is studied.Using combination of theoretical calculation,numerical simulation and field monitoring,the maximum horizontal displacement and maximum pile cracks of the 4# pier pile foundation under the original differential stacking and optimized differential stacking preload conditions are analyzed.The results show that the maximum horizontal displacement of the pile foundation under the preloading condition of the original heap load difference does not meet the requirements of the specification,and the maximum pile cracks meet the requirements of the specification;by optimizing the amount of loading difference,the maximum horizontal displacement of pile foundation and the maximum crack of pile body under preloading meet the design specification requirements.The research results can provide theoretical support and engineering reference for the surcharge preloading of similar deep soft soil foundations.