大面积深基坑工程对高速铁路的影响性分析  

Analysis of the Influence of Large Area Deep Foundation Pit Engineering on the Adjacent High-speed Railway

作　　者：王菲[1] 

机构地区：[1]铁道第三勘察设计院集团有限公司,天津300251

出　　处：《铁道工程学报》2017年第4期10-14,64,共6页Journal of Railway Engineering Society

摘　　要：研究目的:本文以某大面积深基坑为工程背景,该基坑邻近既有高速铁路桥梁及路基段,为确保施工期间铁路运营的安全性、降低施工风险,文中依据现行规范建立合理的高速铁路安全评估标准,经有限元模拟,分别对高速铁路路基及桥梁的沉降、相邻桥墩差异沉降、横向水平变形、纵向水平变形、轨道平顺性以及桥梁基础结构安全性等进行计算分析并给出合理的评价,从而确保基坑工程施工过程中高速铁路运营的安全性。研究结论:(1)高速铁路路基、桥梁叠加初始设计值后,各施工阶段的累积沉降值满足规范中15 mm、20 mm的限值要求;(2)高速铁路桥梁叠加初始设计值后的累积差异沉降满足规范中4 mm的限值要求;(3)叠加初始设计值后,各施工阶段横向水平变形均小于规范限值15.75 mm,纵向水平变形均小于规范限值28.06 mm;(4)在整个施工过程中,正线桥梁单桩承载力值均满足单桩容许承载力要求;(5)该研究成果可为邻近高速铁路的深基坑开挖等类似工程领域提供借鉴。Research purposes： Taking a large area deep foundation pit project which was close bridge and roadbed section as background, to insure the safety of high - speed railway, a criterion of high -speed railway was established according to current codes in this paper to a high - speed railway proper safety evaluation By using finite element simulation, settlement of high - speed railway bridge and roadbed, differential settlement of adjacent piers, lateral horizontal deformation, longitudinal horizontal deformation, track regularity and structural safety of bridge foundation were calculated and analyzed and reasonable safety evaluation of the high - speed railway was given in this paper. Research conclusions： （ 1 ） After adding the design value, settlement of each construction stage of high - speed railway bridge and roadbed met the specification requirements of 15 mm and 20 ram. （2） Differential settlements of adjacent piers of high - speed railway bridge met the specification requirements of 4 mm. （3） Lateral horizontal deformation and longitudinal horizontal deformation of each construction met the specification requirements of 15.75 mm and 28.06 mm. （4） During construction, each single pile bearing capacity of the main lines bridge met the allowable bearing capacity. （5） This research was suitable for these deep foundation pit projects that adjacent high - speed railway.

关 键 词：大面积 深基坑 高速铁路 铁路桥 路基 有限元 基坑开挖 差异沉降 

分 类 号：U447[建筑科学—桥梁与隧道工程]