上海洋山港自动化堆场堆载变形及其对邻近起重机轨道和高架桥桩影响的数值分析

Numerical Analysis of Stack Loading Deformation at Shanghai Yangshan Port Automated Storage Yard and Its Influence on Adjacent Crane Tracks and Viaduct Piles

重型集装箱的堆载变形会对堆场和周边建筑的运营和安全造成不利影响。以上海洋山港自动化堆场改建工程为背景,通过三维数值模拟分析了不同工况下集装箱堆载引起的堆场变形及其对邻近既有自动化起重机(ARMG)轨道和高架桥梁桩基础的影响。土体本构模型采用能反映土体小应变特性的小应变硬化土本构(HSS)模型,并结合场地勘察数据确定了HSS模型参数。计算结果表明:当堆箱区满载60 kPa时,不排水条件下,堆场土体的变形对轨道的影响较小,但对桩基础的水平变形影响最为显著,桩基础最大水平变形为3.14 mm;先不排水堆载而后固结条件下,堆场土体的水平和竖向变形最为明显,堆场土体变形对轨道变形影响最大,轨道最大水平变形为1.85 mm,对桩基础的竖向变形影响也最大,桩基础最大竖向变形为23.8 mm;排水堆载条件下,堆场土体变形对桩基础的水平变形影响最小。各工况下堆场土体、轨道和桩基础的位移满足现行规范的位移控制要求。研究结果可为类似集装箱堆场的设计优化与施工提供理论支持和工程借鉴。

The yard loading deformation of heavy containers can damage the operation and safety of the storage yard and surrounding buildings.Based on the reconstruction project of the automated storage yard of Shanghai Yangshan Port,the deformation of the storage yard caused by container stacking under different working conditions and its influence on the adjacent existing automatic crane(ARMG)tracks and viaduct pile foundation are analyzed by three-dimensional numerical simulation.The small strain hardening soil(HSS)model is used as the constitutive model of soil,which can reflect the small strain characteristics of soil,and the parameters of HSS model are determined by combining with the site investigation data.The calculation results show that when the full load of the container stacking area is 60 kPa,the influence of the soil deformation on the track is small under the undrained condition,but the influence on the horizontal deformation of the pile foundation is most significant,and the maximum horizontal deformation of the pile foundation is 3.14 mm.Under the condition of consolidation following undrained loading,the horizontal and vertical deformation of the soil in the storage yard is the most evident,and the soil deformation in the storage yard has the greatest influence on the track deformation,with the maximum horizontal deformation of 1.85 mm,and on the vertical deformation of the pile foundation,with the maximum vertical deformation of 23.8 mm.Under the condition of drainage loading,the influence of soil deformation on the horizontal deformation of pile foundation is the smallest.The displacement of soil,track and pile foundation in the storage yard under various working conditions meets the displacement control requirements of the current code.The research results can provide theoretical support and engineering references for the design optimization and construction of similar container yards.