坑底隆起对抗浮锚杆作用下既有隧道变形影响的计算  

Calculation of the effect of uplift on deformation of existing tunnelsunder actions of anti-floating anchors

作　　者：王哲[1] 周烨波 魏纲 翁家华 韩凯航 WANG Zhe;ZHOU Yebo;WEI Gang;WENG Jiahua;HAN Kaihang(Institute of Geotechnical Engineering,Zhejiang University of Technology,Hangzhou 310023,China;Department ofCivil Engineering,Hangzhou City University,Hangzhou 310015,China;College of Civiland Transportation Engineering,Shenzhen University,Shenzhen 518060,China)

机构地区：[1]浙江工业大学岩土工程研究所,浙江杭州310023 [2]浙大城市学院土木工程系,浙江杭州310015 [3]深圳大学土木与交通工程学院,广东深圳518060

出　　处：《浙江工业大学学报》2025年第1期1-7,共7页Journal of Zhejiang University of Technology

基　　金：浙江省基础公益研究计划项目(LGF22E080012)。

摘　　要：考虑基坑坑底隆起对下卧隧道的影响,建立坑底隆起引起带抗浮锚杆的盾构隧道位移计算模型。基于影像源法,推导得到坑底隆起引起下卧带抗浮锚杆盾构隧道的纵向变形公式。结合工程实例,对比工程实际测量值、理论计算值和三维有限元模拟值,验证计算模型的准确性,研究抗浮锚杆数量对隧道变形的影响。研究结果表明:隧道隆起主要发生在强影响区内,环间转角和错台发生在弱影响区内;隧道隆起主要受基坑尺寸影响,假设基坑开挖长度为L,安装抗浮锚杆可以减小隧道隆起量、环间转角和错台量,环间转角和错台量主要受基坑开挖尺寸的影响,始终在±3L/5处达到极值;在一定范围内增加抗浮锚杆数量可以有效减小隧道变形量,抗浮锚杆超出一定数量后控制效果提升不明显。By considering the effect of uplift of the pit bottom on tunnels,a displacement calculation model of shield tunnels with anti-floating anchors caused by the uplift of the pit bottom is established.Based on the image source method,the longitudinal deformation formula of shield tunnels with anti-floating anchors under the horizontal belt caused by the uplift of the pit floor is derived.Combined with engineering examples,the accuracy of the calculation method is verified by comparing the measured values,theoretically calculated values and three-dimensional finite element simulation values and the influence of number of anti-floating anchor rods on the deformation of tunnels is studied.The results show that the tunnel bulge occurs mainly in the areas of strong influence while the inter-ring angle and misalignment occur in the areas of weak influence.The tunnel uplift is mainly affected by the size of the foundation pit.For an excavation length L of the foundation pit,anti-floating anchor rods can reduce the uplift,inter-ring angle and misalignment of tunnels.The inter-ring angle and the misalignment are mainly affected by the size of the foundation pit excavation and always reach the extreme value at±3 L/5.In a certain range,increasing the number of anti-floating rods can effectively reduce the deformation of tunnels,but the control effect is not significant beyond a certain range.

关 键 词：基坑工程 盾构隧道 影像源法 抗浮锚杆 隧道变形 

分 类 号：TU473[建筑科学—结构工程]