西安地铁车站深基坑变形规律的有限差分法模拟  

FLAC Simulation of the Deformation Law of Deep Excavation Supporting Structure at Xi'an Subway Station

作　　者：任建喜[1] 王江[1] 孟昌[1] 陈江[1] 朱元伟[1] 王松[1] 

机构地区：[1]西安科技大学建筑与土木工程学院

出　　处：《城市轨道交通研究》2015年第2期39-43,48,共6页Urban Mass Transit

基　　金：高等学校博士学科点专项科研基金项目(20096121110004)

摘　　要：采用数值模拟与现场实测相结合的方法研究西安地铁车站深基坑变形规律。计算结果表明,桩身水平位移能够直接反映围护结构变形特性,围护桩水平位移最大的地方发生在基坑中部到三分之二基坑深度处,基坑周边地表沉降槽中心距坑壁8 m。将数值计算值与现场实测值对比分析发现,各个工况下桩身水平位移、内支撑轴力以及基坑周围地表沉降的实测值和模拟值趋势基本一致,表明FLAC(有限差分法)数值模拟可为施工前深基坑围护结构设计方案的可行性做出合理评价。Combining numerical simulation with field measurement, the deformation law of deep excavation pit supporting structure at Xi＇an subway station is researched. The result of numerical simulation shows that the pile horizontal displacement could directly reflect the retaining structure deformation characters, and the maximum horizontal displacement of piles appears in the two thirds foun- dation pit depth from the foundation pit center, and the distance from surface settling tank center to pit wall is 8 meters. Compared to the field measurement value, the re- sult shows that the changing trend of measured values and the analog value is basically consistent. Besides, the FLAC （fast lagrangian analysis of continua） numerical simulation could serve as an evaluation method to verify the reasonableness of supporting structure deformation design program before construction.

关 键 词：地铁车站 深基坑 围护结构 变形规律 数值模拟 

分 类 号：U231.3[交通运输工程—道路与铁道工程]