土压平衡盾构施工引起公路地表沉降分析  

Analysis of Road Surface Settlement Caused by Tunnel Construction with Earth Pressure Balanced Shield

作　　者：牟其海[1] 李帅[2] 魏晨慧[2] 荣晓洋[2] 

机构地区：[1]沈阳市市政工程设计研究院,辽宁沈阳110015 [2]东北大学资源与土木工程学院,辽宁沈阳110004

出　　处：《城市道桥与防洪》2014年第1期123-129,12,共7页Urban Roads Bridges & Flood Control

摘　　要：该文针对沈阳地区的水文地质特征,采用岩土工程分析软件MIDAS—GTS,基于Mohr—Coulomb本构模型理论,考虑砂土体的线弹性变形特征,建立了隧道开挖过程的二维及三维模型。通过地表沉降横向和纵向规律分析,发现:盾构法隧道施工过程中地面沉降与隧道覆土厚度H,盾构外径D,以及相对埋深H/D有关;隧道地表土体的水平向位移隧道中心处最小,随着覆土厚度的加大,水平位移影响区域也逐渐变大;地表最大沉降量随着覆土厚度与隧道外径之比H/D的增大而减小。Aiming at the hydrogeology in Shenyang,using the geotechnical engineering software MIDASGTS and based on the Mohr-Coulomb constitutive model theory,the article introduces the elastic deformation characteristics of sandy soil and a two-dimensional model and a three-dimensional model are established for tunnel excavation process.According to the analysis of the horizontal and longitudinal rules of surface settlement,the surface settlement is related with the overburden thickness H of tunnel,outer diameter D of shield and the relative depth H/D in the tunnel construction with the shield method.It is shown that the horizontal displacement of the tunnel surface soil is smallest at the center of tunnel.With the increment of overburden thickness,the horizontal displacement influence area will also increase gradually.The maximum surface settlement decreases with the increment of the overburden thickness and the outer diameter ratio H/D of tunnel.

关 键 词：盾构施工 数值模拟 地表沉降 

分 类 号：U455.43[建筑科学—桥梁与隧道工程]