基于HSS模型的新建墩台对邻近桥墩基础的影响研究  

Influence of New Pier Construction on Adjacent Existing High Speed Railway Pier Foundation

作　　者：王采扣 黄涛 常伟 王海元 濮仕坤 翟永勇 Wang Caikou;Huang Tao;Chang Wei;Wang Haiyuan;Pu Shikun;Zhai Yongyong(The First Geological Brigade of Jiangsu Geological Bureau,Nanjing 210098,Jiangsu,China;School of Defense Engineering,Army University of Engineering,Nanjing 210098,Jiangsu,China;Nanjing Survey Engineering Co.,Ltd.,Nanjing 210098,Jiangsu,China)

机构地区：[1]江苏省地质局第一地质大队,江苏南京210098 [2]陆军工程大学国防工程学院,江苏南京210098 [3]南京勘察工程有限公司,江苏南京210098

出　　处：《岩土工程技术》2024年第6期704-711,共8页Geotechnical Engineering Technique

基　　金：国家自然科学基金青年基金项目(51609071)。

摘　　要：为了研究新建墩台施工对邻近高铁桥墩基础的影响,首先基于小应变土体硬化模型(hardening soil model with small-strain stiffness,简称HSS模型),利用PLAXIS 3D有限元软件建立新建墩台施工全过程计算模型,然后分析邻近既有线高铁桥墩基础土体位移特性,并与现场监测数据对比验证有限元计算模型的可靠性,最后计算分析墩台和桩体的位移情况。结果表明:基坑开挖过程模拟采用HSS模型,有助于有限元计算中获得较可靠的位移结果;既有高铁桥墩基础土体方面,水平向基坑方向最大水平位移1.53 mm,最大沉降5.49 mm。既有墩身和承台最大沉降量小于6 mm,墩承台总沉降和相邻墩承台差异沉降均小于规范限值。既有桩基础群桩外围顶部向四周产生位移,而中间桩顶部沉降较小,呈“开花式”位移状态。在新建墩台施工过程中,钻孔灌注桩的施工、钢板桩的插拔和基坑回填对既有高铁桥墩基础水平位移和沉降影响较大。To study the influence of new pier construction on adjacent high-speed rail pier foundation,the whole construction process calculation model of the new pier was established based on the hardening soil model with small-strain stiffness(HSS model)and PLAXIS 3D finite element software,and then the soil displacement characteristics of adjacent existing high-speed rail pier foundation were analyzed.The reliability of the finite element model was verified by compared with the field monitoring data.The displacement of the pier and pile was calculated and analyzed.The results show that the HSS model is helpful to obtain more reliable displacement results in finite element calculation.In terms of soil mass,the maximum horizontal displacement and settlement are 1.53 mm and 5.49 mm in the horizontal direction of the foundation pit.The maximum settlement of the existing pier and cap is less than 6 mm,and the total settlement of the pier cap and the differential settlement of the adjacent pier cap is less than the standard limit.The outer top of the pile group of the existing pile foundation has a displacement to the four sides,while the top of the middle pile has a small settlement and bears the"open pattern"displacement state.During the construction of the new pier,the construction of the new bored pile,the insertion of the steel sheet pile,and the backfilling of the foundation pit have a great influence on the horizontal displacement and settlement of the existing high-speed railway pier foundation.

关 键 词：墩台施工 邻近既有高铁线 有限元 桥墩基础 位移分析 

分 类 号：U445[建筑科学—桥梁与隧道工程]