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为了揭示单侧边载对既有工程桩的不利影响,结合张家港某高速公路枢纽高架桥基桩-立柱偏移事故的工程实例,分析了路基边载作用下软土地基桥梁桩柱的位移特征和受力机制;根据桥梁桩柱沿竖向受力模式的不同,将边载作用下桥梁桩柱划分为自由段、被动受荷段和主动作用段;在此基础上,考虑到地基塑性屈服和上部结构约束边界的影响,基于三参数地基模型,建立了桥梁基桩-立柱受力响应的微分控制方程,并通过矩阵传递法给出了半解析解答。通过对工程实例中2排桩柱水平位移和受力弯矩的验算,验证了计算方法的适用性,并通过算例分析了桩身离散单元长度、被动段深度对计算结果的影响规律,结果可为单侧边载作用下被动桩受力响应的计算分析提供参考。
In order to reveal the unilateral side load on the existing engineering pile adverse effects, combined with Zhangjiagang Highway Viaduct pile - column offset accident project example, the analysis of the subgrade under the side load of the bridge pile displacement characteristics and According to the difference of vertical stress modes of bridge piles, the pile of bridge under side load is divided into free section, passive load section and active section. Based on this, considering the plastic yield of foundation and Based on the three-parameter foundation model, a differential governing equation of bridge-pile-column response is established and the semi-analytical solution is given by matrix transfer method. The calculation of horizontal displacements and bending moments of two rows of piles in the engineering example verifies the applicability of the calculation method. The influences of the length of the pile and the depth of the passive section on the calculation results are analyzed through an example. The results It provides a reference for the calculation and analysis of the passive response of passive pile under the action of unilateral side load.