不同基坑开挖顺序下地铁变形特性数值分析
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摘要
为了研究深大基坑开挖对临近地铁变形的影响,以天津某基坑为研究对象,运用PLAXIS3D数值分析软件,模拟分析了三种开挖工况下地铁变形特性。结果表明:深大基坑开挖导致的地铁车站及隧道水平位移大于竖向位移,但竖向位移的不均匀变化是导致车站及隧道开裂的主要原因;不同的卸载路径会导致不同的地铁变形特性,按照由远及近的开挖原则,选择合理的基坑开挖顺序,可以有效地减少地铁变形。
To study the influence of deep excavation on the deformation of adjacent subway,a foundation pit in Tianjin was taken as the object to simulate and analyze the deformation characteristics of subway under three excavation cases with PLAXIS3D numerical analysis software.The result shows that deep excavation causes horizontal displacement of adjacent subway station and tunnel greater than the vertical displacement thereof,but the uneven variation of vertical displacement is the main reason of the cracks at the station and tunnel;different unloading paths will lead to different deformation characteristics of the subway,according to the principle of excavation from far to near,proper selection of excavation sequence to be designed can reduce the deformation effectively.
To study the influence of deep excavation on the deformation of adjacent subway,a foundation pit in Tianjin was taken as the object to simulate and analyze the deformation characteristics of subway under three excavation cases with PLAXIS3D numerical analysis software.The result shows that deep excavation causes horizontal displacement of adjacent subway station and tunnel greater than the vertical displacement thereof,but the uneven variation of vertical displacement is the main reason of the cracks at the station and tunnel;different unloading paths will lead to different deformation characteristics of the subway,according to the principle of excavation from far to near,proper selection of excavation sequence to be designed can reduce the deformation effectively.
引文
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[2]刘方梅.深基坑开挖对临近地铁隧道的影响[D].杭州:浙江大学,2015.LIU F M.Influence on adjacent tunnel in processes of deep foundation[D].Hangzhou:Zhejiang University,2015.
[3]王继华,刘涛,严莉,等.深圳某项目基坑开挖对地铁影响的风险应对与实践[J].施工技术,2015,44(7):77-82,86.WANG J H,LIU T,YAN L,et al.Risk response and practice of foundation excavation effect on subway in a project in Shenzhen[J].Construction Technology,2015,44(7):77-82,86.
[4]贺建军.膨胀土深基坑开挖对临近地铁建筑变形控制的研究[D].成都:西南交通大学,2016.HE J J.Research on the deformation control of expansive soil deep foundation pit excavation on metro construction nearby[D].Chengdu:Southwest Jiaotong University,2016.
[5]李宗艺.基坑施工对临近地铁隧道衬砌结构的影响及控制措施[D].郑州:郑州大学,2017.LI Z Y.Study on influence of foundation pit construction on lining structure of the subway tunnel and control measures[D].Zhengzhou:Zhengzhou University,2017.
[6]郭晓欢.北京某深大基坑工程紧邻既有地铁车站风险分析与控制研究[D].北京:北京交通大学,2016.GUO X H.Research on risk analysis and control of existing subway station affected by the adjacent construction of deep and large foundation pit in Beijing[D].Beijing:Beijing Jiaotong University,2016.
[7]付江山,姚佳兵,徐新,等.超大基坑施工对临近建筑物影响研究[J].路基工程,2017(6):103-106,112.FU J S,YAO J B,XU X,et al.Study on influence of super large foundation pit construction on adjacent buildings[J].Subgrade Engineering,2017(6):103-106,112.
[8]张治国,张孟喜,王卫东.基坑开挖对临近地铁隧道影响的两阶段分析方法[J].岩土力学,2011,32(7):2085-2092.ZHANG Z G,ZHANG M X,WANG W D.Two-stage method for analyzing effects on adjacent metro tunnels due to foundation pit excavation[J].Rock and Soil Mechanics,2011,32(7):2085-2092.
[9]杜宏元.不同基坑开挖顺序对临近地铁车站的影响分析[J].山西建筑,2011,37(18):57-59.DU H Y.Influence analysis of different foundation pit excavation sequence on close-by subway station[J].Shanxi Architecture,2011,37(18):57-59.
[10]汪晓亮,刘波,洪顺生.地铁车站基坑开挖顺序对建筑物沉降影响[J].佳木斯大学学报(自然科学版),2016,34(4):512-516.WANG X L,LIU B,HONG S S.Building responses of excavation sequences in a metro station foundation pit[J].Journal of Jiamusi University(Natural Science),2016,34(4):512-516.
[11]崔健武.明挖隧道跨地铁施工方法研究---以苏州城北路隧道跨地铁2号线为例[D].南京:东南大学,2017.CUI J W.Study on construction method of tunnel crossing subway:taking Suzhou Chengbei road tunnel across the subway line 2 as an example[D].Nanjing:Southeast University,2017.