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杨波,孙大齐,周记名.地铁车站深基坑动态施工过程变形规律与数值仿真分析[J].河北工程大学自然版,2020,37(2):38-44
地铁车站深基坑动态施工过程变形规律与数值仿真分析
Deformation Properties and Numerical Simulation Analysis of Dynamic Construction Process of Deep Foundation Pit in Metro Station
投稿时间:2020-02-20  
DOI:10.3969/j.issn.1673-9469.2020.02.007
中文关键词:  基坑工程  地铁车站  变形规律  数值模拟  内力与变形
英文关键词:foundation pit engineering  subway station  deformation law  numerical simulation  internal force and deformation
基金项目:国家自然科学基金资助项目(51268003)
作者单位
杨波 浙江华东建设工程有限公司, 浙江 杭州 310000 
孙大齐 中国铁道科学研究院, 北京 100081 
周记名 中国土木工程集团有限公司, 北京 100038 
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中文摘要:
      以南京地铁虹桥站深基坑工程为依托,结合土体开挖过程中基坑各项监控量测数据,利用FLAC 3D软件建立车站深基坑的三维数值仿真模型,对基坑的开挖和支护动态施工过程进行模拟,对比研究数值仿真的变形计算结果与监控量测数据,研究结果表明:(1)地连墙水平位移在墙身范围内,大致呈"弓"形,随着基坑的开挖而呈非线性增加,位移峰值出现在基坑开挖工作面附近。(2)地表土体受基坑开挖的影响范围主要在基坑边1HH为基坑深度)范围内,不同工况下沉降曲线大致呈抛物线形,且沉降峰值呈线性增加,峰值沉降发生在0.5H附近;在同一工况条件下,随着时间的推移,不同距离位置处的土体位移呈现不断重分布的过程,但整体曲线仍呈"凹"形。(3)基坑隆起量也与基坑开挖过程有关,土体的最大隆起量发生在基坑中轴线附近,随着开挖深度的增加隆起量呈非线性增加。(4)支撑的架设对围护结构的变形和土体的沉降控制能起到良好的正面作用,延迟支撑架设对变形的发展极为不利。
英文摘要:
      Based on the deep foundation pit project of Hongqiao Station of Nanjing Metro, combined with the monitoring and measurement data of the foundation pit in the process of soil excavation, FLAC 3D software was used to establish a three-dimensional numerical simulation model of the deep foundation pit of the station so as to simulate the excavation and support dynamic construction process of the foundation pit. In addition, the deformation calculation results and monitoring data of the numerical simulation were compared. The research results show that:(1) the horizontal displacement of the diaphragm wall is in the range of the wall body, approximately in the shape of parabola. With the excavation of the foundation pit, it increases nonlinearly, and the peak value of displacement appears near the excavation working face of the foundation pit. (2) The influence of the surface soil by the excavation of the foundation pit is mainly in the range of 1H (H is the depth of the foundation pit), and the settlement curve under different working conditions is approximately parabola, and the peak value of settlement is linear Increase; under the same working condition, the displacement value of monitoring points at different positions presents a process of continuous redistribution over time, but the overall curve is still "concave". (3) The amount of foundation pit uplift is also related to the excavation process of foundation pit, the maximum uplift of soil occurs near the central axis of foundation pit, and the amount of uplift increases nonlinearly with the increase of excavation depth. (4) The erection of support can play a positive role in the deformation of the retaining structure and the settlement control of the soil mass, and the delayed erection of the support is extremely unfavorable to the development of the deformation.
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