并桥位新建桥梁对既有桥梁桩基的影响分析

以某新建黄河公路大桥为工程背景,针对新建桥梁与既有桥梁并桥位建设,新旧桥梁桩基距离近的结构特点,采用岩土数值模拟方法对新建桥梁施工及运营期既有桥梁基础变形及受力的影响规律进行分析研究。结果表明,新建桥梁建成后,既有桥在运营荷载作用下基础平均沉降值为2.7 cm,最大横桥向变形值1.2 cm。施工期不均匀沉降值1.4 cm,桩基受力增大10%,桩身最大压应力为8.68 MPa,承台最大拉应力为1.18 MPa,既有桥桩基变形量及桩基承载力满足设计及规范限值要求。

Analysis of the Influence of the Newly Building Bridge on the Pile Foundation of Adjacent Existing Bridge

Taking the example of a new Yellow River Highway Bridge,the geotechnical numerical method is adapted according to its characteristics of long pile and short distance to analyze the influence of newly building bridge on the existing bridge foundation deformation and pile foundation force during construction and operation period.The research results indicate that under design loads the average settlement value of the existing bridge is 2.7 cm,the maximum transverse deformation of the pile foundation is 1.2 cm,the uneven settlement value during construction period is 1.4 cm,the pile foundation force of the existing bridge is increased by 10%,the maximum compressive stress of the pile is 8.68 MPa,the maximum tensile stress of the pile is 1.18 MPa,and the pile foundation deformation and pile bearing capacity of the existing bridge can meet the design and specification limit requirements after checking and calculating.