软弱地质地铁深基坑变形特征数值模拟分析  

Numerical Simulation Analysis of Deformation Characteristics of Deep Foundation Pits in Soft Geological Metro

作　　者：喻晓强 YU Xiaoqiang(Jiujiang Road Emergency Rescue Team,Jiujiang,Jiangxi 332000,China)

机构地区：[1]九江市公路应急抢险大队,江西九江332000

出　　处：《黑龙江交通科技》2025年第4期95-99,共5页Communications Science and Technology Heilongjiang

摘　　要：通过有限元数值模拟的方法建立基坑三维模型对砂、靠近水域淤泥地质的基坑在开挖过程中的变形规律进行分析,分析结果表明:距离基坑边缘>18 m时,区域内地表沉降相对减少、随着距离基坑边缘的位置不断增大,基坑的坑外地表沉降影响不断扩大,但对应的地表沉降值在减小,影响在减弱;此基坑在前两个步骤开挖中,基坑底部均匀隆起,随着开挖深度的加深,隆起现象会越来越严重;在靠近水域的基坑,由于地下水的影响,墙体变形相对严重;延长连墙嵌固深度可以改善坑外地表的沉降和减小墙体位移。The three-dimensional model of the foundation pit was established by numerical simulation method using the finite element software to analyze the deformation of the foundation pit in the excavation process of sand and silt near the water area.The results show that:the surface settlement in the area more than18 m away from the edge of the foundation pit is relatively reduced.As the distance from the edge of the pit increases,the surface settlement outside the foundation pit continues to expand,but the corresponding surface settlement value is decreasing,and the influence is weakening.In the first steps of excavation of this foundation pit,the bottom of the foundation pit rises evenly.As the excavation depth increases,the bulging phenomenon will become more and more.In the foundation pit near the water area,the deformation of the wall is relatively serious due to the influence of groundwater.Extending the embedded depth of the wall can improve the surface settlement outside the foundation pit and reduce the displacement of the wall.

关 键 词：软弱地质 地铁深基坑 数值模拟 

分 类 号：U231.3[交通运输工程—道路与铁道工程]