华东交通大学学报2023，Vol.40Issue(6)：17-24,8.
基于NSM分析双线隧道下穿对既有隧道影响
Effects of New Twin Underneath Tunneling on Existing Tunnels Based on NSM Study
摘要
Abstract
In order to investigate the effects of new twin tunneling on the longitudinal displacement of existing shield tunnel,Pasternak double parameters of the elastic foundation and Euler-Bernoulli beam model is em-ployed to consider the new tunnel,existing tunnel skew angle and the tunnel excavation causing factors such as ground loss.The new double line tunnel excavation caused by free field vertical displacement of surrounding soils is determined by Loganathan-Poulos solution and superposition principle,and null space method is used to calculate the settlement deformation of the existing tunnel.Taking Shenzhen Metro Line 9 passing under Metro Line 4 as an example,the predicted results by the null space method is compared with the field-measured data.The effect of horizontal distance,ground loss,skew angle and depth of the new tunnel on existing tunnel settle-ment is further analyzed.The results show that the distance between the two lines of the new tunnel significantly affects the settlement of the existing tunnel in a range of 7 times its outer diameter.The settlement decreases with the increase of the distance,the settlement domain increases as the distance increases.The settlement pat-tern changes from"V"to"W".When the distance is larger than 7 times the outer diameter of the new tunnel,the settlement and pattern tend to be stable.In addition,ground loss,skew angle and the depth of the new tun-nel significantly influences the settlement.It increases with the increase of ground loss,and decreases with the skew angle and the depth of the new tunnel.关键词
双线隧道下穿/既有隧道/零空间法/隧道沉降Key words
twin underneath tunneling/existing tunnel/null space/tunnel settlements分类
交通工程引用本文复制引用
江思岑,柴天建,颜建伟..基于NSM分析双线隧道下穿对既有隧道影响[J].华东交通大学学报,2023,40(6):17-24,8.基金项目
国家自然科学基金项目(12072112) （12072112）
