砂土层中类矩形盾构施工对邻近既有隧道造成影响的模型试验研究  

Experimental Study on Responses of Existing Tunnels to Adjacent Quasi-Rectangular Shield Tunneling in Sandy Soil

作　　者：赵得乾麟 魏纲 梁禄钜 姜海波[4,5] 项鹏飞 木志远 ZHAO Deqianlin;WEI Gang;LIANG Luju;JIANG Haibo;XIANG Pengfei;MU Zhiyuan(Department of Civil Engineering,Hangzhou City University,Hangzhou 310015,Zhejiang,China;Guangzhou Nansha Assets Operation Group Limited,Guangzhou 511466,Guangdong,China;Key Laboratory of Safe Construction and Intelligent Maintenance for Urban Shield Tunnels of Zhejiang Province,Hangzhou 310015,Zhejiang,China;College of Hydraulic and Civil Engineering,Xinjiang Agricultural University,Urumqi 830052,Xinjiang,China;College of Water Conservancy&Architectural Engineering,Shihezi University,Shihezi 832003,Xinjiang,China;Department of Architectural Engineering,Zhejiang Tongji Vocational College of Science and Technology,Hangzhou 311200,Zhejiang,China)

机构地区：[1]浙大城市学院土木工程系,浙江杭州310015 [2]广州南沙资产经营集团有限公司,广东广州511466 [3]浙江省城市盾构隧道安全建造与智能养护重点实验室,浙江杭州310015 [4]新疆农业大学水利与土木工程学院,新疆乌鲁木齐830052 [5]石河子大学水利建筑工程学院,新疆石河子832003 [6]浙江同济科技职业学院建筑工程学院,浙江杭州311200

出　　处：《隧道建设（中英文）》2024年第5期1000-1011,I0050-I0061,共24页Tunnel Construction

基　　金：浙江省基础公益研究计划资助项目(LGF22E080012)。

摘　　要：为探究砂土层中考虑新建类矩形盾构隧道施工过程中土体的损失和新建隧道与既有盾构隧道不同位置时,新建类矩形盾构隧道对既有隧道的围压、隧道拱底应变和拱顶位移的影响,采用室内模型试验的方法,进行新建类矩形隧道重叠下穿、夹穿和不同隧道间距下正交90°下穿的试验。研究结果表明:1)各种工况下新建类矩形盾构隧道在夹穿既有隧道时对上线既有隧道的影响最大;2)夹穿工况下,新建类矩形盾构隧道开挖到既有隧道下方时,上线既有隧道拱底围压发生突变且数值极大;3)隧道的间距是新建类矩形盾构隧道施工时引起既有盾构隧道围压、拱底应变、拱顶位移等发生改变的重要影响因素,实际施工时应尽可能保持新建隧道与原有盾构隧道的间距足够大;4)新建类矩形盾构隧道下穿既有隧道过程中,既有隧道拱顶存在快速变形的阶段,在实际工程中需要重视这一过程中对隧道拱顶变形速率的控制。Indoor modeling experiments are conducted to investigate the influence of quasi-rectangular shield tunneling on the confining pressure and deformation of adjacent existing tunnels in sandy soils.In this study,ground loss during the construction as well as the relative positions of the new and existing tunnels are investigated.Different construction conditions,including overlapping underpass,pinch underpass,and orthogonal underpass with varying tunnel spacings are assessed.Results indicate that:first,among various construction conditions,the new quasi-rectangular shield tunnel has the most significant impact on the existing tunnel when it passes through in a constrained manner.Under this condition,quasi-rectangular shield tunneling beneath the existing tunnel leads to a sudden and notably remarkable change in the confining pressure at the bottom of the tunnel′s arch.Then,the spacing between tunnels remarkably affects the confining pressure,the strain at the arch bottom of the existing tunnel,and the displacement at the crown of the existing tunnel during the new quasi-rectangular shield tunneling.Therefore,a sufficiently safe distance between the new and existing tunnels must be maintained.Finally,the deformation of the existing tunnel crown is sharply increased in a certain stage during the new quasi-rectangular shield tunneling underneath.In actual engineering,considerable attention must be provided to control the deformation rate in this stage.

关 键 词：类矩形盾构 既有隧道 下穿 盾构施工 模型试验 

分 类 号：U45[建筑科学—桥梁与隧道工程]