小北河太子河特大桥桩基砂土问题研究  

Research on the Sandy Soil Problem of the Pile Foundation of Xiaobeihe Taizihe Bridge

作　　者：吴涛 Wu Tao(Liaoyang Transportation Service Center,Liaoyang 111000,China)

机构地区：[1]辽阳市交通运输事务服务中心,辽阳市111000

出　　处：《北方交通》2023年第11期5-9,共5页Northern Communications

摘　　要：砂土液化涉及液相与固相相互转化的过程,是重要的工程安全问题。以辽阳市小北河太子河特大桥为例,通过分析地质情况和设计要求,探究了砂土液化对桥梁工程的影响。对比分析了正常桩长和考虑砂土液化后的桩长。采用离散元分析了桩基础周围砂土的运动特性。结果表明,太子河特大桥地面15m内存在饱和细砂处于轻微液化状态,设计桩长超过15m,具有足够的安全性,桩基长度的增加提高桩基四周土体运动状态的稳定性。研究结果对桥梁桩基设计施工具有一定借鉴意义。Sand liquefaction involves the process of mutual transformation between liquid phase and solid phase,which is an important engineering safety issue.Taking Xiaobeihe Taizihe grand bridge in Liaoyang as an example,the impact of sand liquefaction on bridge engineering is explored by analyzing the geological conditions and design requirements.The comparative analysis is made between the normal pile length and the pile length after considering sand liquefaction.The motion characteristics of sandy soil around the pile foundation are analyzed by using the discrete element.The results show that,there is saturated fine sand within 15m of the ground surface of Taizihe grand bridge,which is in a slightly liquefied state.The designed pile length exceeds 15m,which has sufficient safety.The increase in the pile foundation length improves the stability of the soil mass motion state around the pile foundation.The research results have certain reference significance for the design and construction of bridge pile foundation.

关 键 词：桥梁工程 砂土液化 离散元 结构特征 桩长计算 

分 类 号：U445.551[建筑科学—桥梁与隧道工程]