摘要
邻近地铁车站附属进行深基坑施工将会对车站附属结构及地铁运营安全产生影响。以石家庄天河城市下沉广场深基坑施工为背景,通过划分不同的施工阶段,采用MIDAS软件模拟分析该项目施工对邻近车站附属水平及竖向位移的影响,并与监测结果进行对比分析。同时将计算位移叠加至附属结构上验算其配筋及裂缝。结果表明,随着下沉广场施工,车站附属将产生水平及竖向位移,开挖至基坑底部时附属结构的位移最大,附属结构主要以竖向位移为主。通过对既有附属结构进行位移叠加验算后,附属结构配筋、裂缝均满足规范要求。通过模拟计算结果与实际监测结果对比分析,得出各施工工况下附属结构的计算结果与实测结果变形规律大体一致,证明数值模拟计算结果合理可行。
The foundation pit excavation near the existing metro station auxiliary structure is expected to have impact on the metro station auxiliary structure and the safe operation.Taking the construction of the deep foundation pit of a Sunken Plaza in Shijiazhuang as the background,by dividing different construction stages,MIDAS software was used to simulate and analyze the impact of the construction on the horizontal and vertical displacements attached to the neighboring stations,and the results were compared with the monitoring results.The calculated displacement is superimposed on the interval tunnel to check its reinforcement and cracks.The results show that:with the construction of the sunken square,the metro station auxiliary structure will produce horizontal and vertical displacement.The displacement of the metro station auxiliary structure reaches the maximum when the excavation reaches the bottom of the foundation pit,and the vertical displacement is mainly.After checking the displacement superposition of the metro station auxiliary structure,the reinforcement and cracks of the interval tunnel meet the requirements of the specification.By comparing the calculated results with the measured results,the deformation law of the calculated results and the measured results under various construction conditions is generally consistent,which proves that the numerical simulation results are reasonable and feasible.
作者
张旭
王杰杰
Zhang Xu;Wang Jiejie(Beijing Urban Construction Design&Development Group Co.,Limited,Beijing 100037,China;Hebei Yingbo Certification Co.,Ltd.,Shijiazhuang 050000,Hebei,China)
出处
《岩土工程技术》
2023年第4期492-498,共7页
Geotechnical Engineering Technique
关键词
深基坑施工
地铁车站附属结构
数值模拟
影响分析
deep foundation pit excavation
metro station auxiliary structure
numerical simulation
impact analysis
