杭甬高铁桥墩基础偏移及纠偏处理

Foundation Deflection and Its Rectifying Deviation of the Hangzhou-Ningbo High-speed Railway Pier

杭甬高铁宁波特大桥桥墩由于临近场地大量弃土堆载而发生线路横向偏移,本文通过线弹性地基反力法和数值分析方法对该桥墩基础的受力和变形进行了计算分析,比较了两种计算方法所得结果的差异,评估了基桩的长期使用性能。在此基础上,采用数值分析方法对土方卸载和高压旋喷桩联合加固条件下基桩的受力和变形进行了模拟分析,并通过纠偏后的桥墩实测位移分析了纠偏加固效果。

In a certain section of Hangzhou-Ningbo High-speed Railway in soft soil area, the horizontal displacement of a bridge pier is found due to the large area surcharge loads nearby. This paper analyzes the displacement and bending moment of the pier foundation by the elastic foundation reaction method and numerical simulation method, and compares the difference of these two methods; at the same time, the longterm character of service of piles are evaluated. Hereby, simulation analysis is made on the stress and the deformation of foundation pile reinforced with earthwork unloading and driving high- pressure jet grouting and the reinforcement effect of rectification is analyzed by the measurement of pier displacement.