黄河冲积地层深基坑开挖数值模拟及监测分析  

Numerical Simulation and Monitoring Analysis of Deep Foundation Pit Excavation in Alluvial Strata of YellowRiver

作　　者：孔德奥 Kong Deao(China Railway 14th Bureau Group Co.,Ltd.,Jinan 250101,China;China Railway Construction Underwater Tunnel Engineering Laboratory,Jinan 250101,China;Shandong Engineering Research Center of Intelligent Construction and Equipment Remanufacturing of Large Shield Tunnels,Jinan 250101,China)

机构地区：[1]中铁十四局集团有限公司,山东济南250101 [2]中国铁建水下隧道工程实验室,山东济南250101 [3]大盾构隧道智能化建造与装备再制造山东省工程研究中心,山东济南250101

出　　处：《市政技术》2024年第12期197-205,共9页Journal of Municipal Technology

基　　金：山东省自然科学基金青年基金项目(ZR2024QE304);山东省泰山产业领军人才项目(tscx202306015);山东省自然科学基金面上项目(ZR202212040160);山东省企业技术创新项目(2024637010000303);中国铁建股份有限公司科研计划(2023-B04)。

摘　　要：以山东省济南市黄岗路穿黄隧道工程的盾构始发井深基坑开挖及支护工程为背景,通过Midas(GTS/NX)软件对深基坑开挖过程中地下连续墙的水平位移和竖向位移、深基坑地表沉降以及支撑结构轴力进行了数值模拟分析,并与监测数据对比后验证了数值模拟分析有效性。分析结果表明:地下连续墙最大水平位移出现位置约在(0.90±0.47)倍开挖深度处;距离深基坑边缘越远,地面水平位移越小,开挖深度越大,地面水平位移越大,且地下连续墙的竖向位移越大;在深基坑的边缘获得最大地表沉降,且地表沉降随距离深基坑边缘距离的增大而逐渐减小;支撑轴力沿支撑的轴向基本一致,随深基坑开挖的不断推进以及支撑的逐次架设,支撑轴力逐渐增大,最大支撑轴力为9833 kN;架设支撑后降低了地下连续墙及周围土体的变形;实测数据与模拟分析数据相接近,验证了数值模拟分析有效性。Taking the excavation of deep foundation pits and support engineering of the shield shaft of the Huanggang Road Tunnel project in Jinan City,Shandong Province as an example,Midas(GTS/NX)software was applied to conduct numerical simulations and analyses on horizontal displacement,vertical deformation,the surface settlement and the axial force of the supporting structure during the excavation.The simulation analysis was verified to be effective by comparing with monitoring data.The comparison results show that the diaphragm wall’s maximum horizontal displacement is(0.90±0.47)times of the excavation depth;The farther the distance from the pit,the smaller the horizontal displacement.The deeper the excavation depth,the greater the horizontal displacement,as well as the vertical displacement of the diaphragm wall;At the edge of the deep foundation pit,the greatest surface settlement is attained,which reduces with the increases of distance from the foundation pit;The supporting axial force is aligned with the supporting axis.With the continual excavation of the foundation pit and the gradually erection of the support,the axial force of the support gradually rises,reaching a peak of 9833 kN;After the erection of support,the deformation of the diaphragm wall and surrounding soil is reduced;The measured data are close to the simulated analysis data,which verified the simulation analysis’s validity.

关 键 词：深基坑 地下连续墙 内支撑体系 数值模拟分析 现场监测 

分 类 号：U455.43[建筑科学—桥梁与隧道工程] TU473.2[交通运输工程—道路与铁道工程]