软土地层盾构下穿既有隧道影响规律研究

Research on the influence law of shield tunnels undercrossing existing tunnels in soft soil strata

随着我国城镇化进程持续推进,我国一线城市人口持续膨胀,交通拥堵问题逐渐凸显。近年来随着盾构掘进技术的不断发展,我国的大城市开始采用盾构法修建隧道,以缓解地面交通压力。随着盾构隧道的越来越多,不同线路之间的交叉不可避免。与地面交通的交叉因采用高架桥通过的方式不同,城市地下轨道交通之间的交叉会面临许多安全问题,尤其是在软土地层中,安全问题尤为严峻[1-2]。为了避免上述安全问题,结合武汉轨道交通12号线下穿既有营运地铁6号线工程案例,通过数值模拟、理论计算等方法研究富水软土地层条件下盾构下穿既有营运地铁的变形规律。

With the continuous advancement of urbanization in China,the population of first tier cities continues to expand,and the problem of traffic congestion is gradually becoming prominent.In recent years,with the continuous development of shield tunneling technology,large cities in China have begun to use shield tunneling to build tunnels to alleviate surface traffic pressure.With the increasing number of shield tunnels,the intersection between different lines is inevitable.The intersection with ground transportation can be achieved through elevated bridges,but the intersection between urban underground rail transit faces many safety issues,especially in soft soil layers,where safety issues are particularly severe[1-2].In order to avoid such problems,this article combines the case study of Wuhan Metro Line 12 crossing the existing operating subway Line 6,and studies the deformation law of shield tunneling under the condition of rich water soft soil layer through numerical simulation,theoretical calculation,and other methods.