中国铁道科学2017，Vol.38Issue(4)：40-46,7.DOI:10.3969/j.issn.1001-4632.2017.04.06
卤水井开采对铁路桥梁群桩的影响分析
Influence of Brine Well Mining on Pile Group of Railway Bridge
摘要
Abstract
To study the influence of brine well mining on the safety of bridges along Dezhou-Dajiawa railway,the three-dimensional calculation models of group piles with pile caps were established on the basis of field monitoring data by finite difference software FLAC3D under the condition of different brine well mining.The settlement characteristics of pile and soil as well as the internal force distribution law of each single pile were analyzed under different groundwater level drop in the well.Results show that the surface subsidence area increases gradually and assumes a funnel-shaped distribution with the decrease of groundwater level.The center of the subsidence funnel is located at the center of group wells and the range of surface subsidence is within 100 m from the center of group wells.The settlement of pile group mainly occurs in the course of groundwater level dropping from-9 m to-33.1 m,and the settlement of pile group accounts for 64.7％ of the total settlement amount after construction in this stage.As the level of underground water drops,the axial force of each pile increases first and then decreases along pile body.The negative friction resistance of the upper part of pile body increases gradually.The negative friction resistance increases first and then decreases along pile body.The section of the maximum axial force and the neutral point of each pile moves downward constantly.Under the condition of the same groundwater level drop,the axial force and negative friction resistance of each pile are in the order of corner pile＞side pile＞near borehole center pile＞center pile.When the pumping is finished and the settlement of pile group is stable,the maximum friction resistance at the bottom side of corner pile arrives at the maximum,which is 75 kPa.关键词
卤水井开采/群桩/沉降/轴力/摩阻力/铁路桥/数值模拟Key words
Brine well mining/Pile group/Settlement/Axial force/Friction resistance/Railway bridge/Numerical simulation分类
交通工程引用本文复制引用
王忠昶,李亚洲,白海峰..卤水井开采对铁路桥梁群桩的影响分析[J].中国铁道科学,2017,38(4):40-46,7.基金项目
国家自然科学基金资助项目(51574055) （51574055）
辽宁省自然科学基金资助项目(20170540143) （20170540143）
