重叠盾构施工引起土体变形的随机介质理论计算  

CALCULATION OF SOIL DEFORMATION CAUSED BY OVERLAPPING SHIELD TUNNEL CONSTRUCTION BASED ON STOCHASTIC MEDIUM THEORY

作　　者：周烨波 魏纲 赵得乾麟 ZHOU Yebo;WEI Gang;ZHAO Deqianlin(Department of Civil Engineering,Zhejiang University City College,Hangzhou 310015,China;Key Laboratory of Safe Construction and Intelligent Maintenance for Urban Shield Tunnels of Zhejiang Province,Hangzhou 310015,China;College of Civil Engineering,Shaoxing University,Shaoxing 312000,China)

机构地区：[1]浙大城市学院土木工程系,杭州310015 [2]浙江省城市盾构隧道安全建造与智能养护重点实验室,杭州310015 [3]绍兴文理学院土木工程学院,浙江绍兴312000

出　　处：《低温建筑技术》2022年第2期140-144,154,共6页Low Temperature Architecture Technology

基　　金：国家自然科学基金资助项目(52178399)。

摘　　要：对现有的随机介质理论进行拓展,引入适用范围更广的沉降槽宽度系数取值方法,通过对上线和下线盾构隧道分别计算再叠加的方法,建立重叠盾构隧道施工引起的土体变形计算方法,可以计算地表沉降、深层土体沉降和水平位移,将实测数据与计算结果进行对比。结果表明文中方法计算结果与实测数据比较吻合,具有可靠性;重叠盾构隧道施工引起的地表沉降呈V形;重叠盾构隧道施工引起的土体变形都在隧道轴线处达到最大值;随着深度增加,在隧道上方处的土体变形增大;盾构机在离开开挖面1.5倍上线隧道埋深后,沉降基本稳定,离开开挖面2倍上线隧道埋深后沉降不再增加;由于重叠盾构隧道上下线隧道埋深不同,两条隧道的关键参数取值也不同。This paper extends the existing stochastic medium theory and introduces a value method of settlement trough width coefficient with wider application.The calculation method of soil deformation caused by overlapping shield tunnels construction is established by calculating and superimposing the deformation caused by upper and lower shield tunnels construction separately.The deformation calculation method can calculate surface settlement,subsurface settlement,and horizontal displacement.The calculated results are compared with the monitoring data and the results show that the calculated results of the method in this paper are in good agreement with the monitoring data and are reliable.The surface settlement caused by the construction of overlapping shield tunnels is Vshaped.The soil deformation caused by the construction of overlapping shield tunnels all reached the maximum value at the tunnel axis.As the depth increases,the soil deformation above the tunnel increases.After the shield machine leaving the excavation face for 1.5 times the buried depth of the upper tunnel,the settlement is basically stable and does not increase after leaving the excavation face for 2 times the buried depth of the upper tunnel.Due to the different buried depths of the upper and lower tunnels of the overlapping shield tunnels,the key parameters of the two tunnels are different.

关 键 词：重叠隧道 盾构施工 随机介质理论 土体变形 

分 类 号：TU433[建筑科学—岩土工程]