沪渝蓉高速铁路崇太长江隧道关键技术探讨

Discussion on Key Technologies of Chongtai Yangtze River Tunnel of Shanghai-Chongqing-Chengdu High-speed Railway

拟建沪渝蓉高速铁路在江苏太仓七丫口入地,以隧道形式下穿宽约10.5 km的长江南支,在上海崇明岛万安村钻出地面。穿越长江南支的崇太长江隧道全长14.22 km,隧道在水下最大深度87 m,在地中最大深度为50.5 m,拟按单洞双线修建,设计最高行车时速350 km,其中,盾构段长约13.12 km,盾构外径约15.2 m。工程接近长江口,河床地层松软,属于径流潮汐交织的沉积物;江面宽阔,水深及冲刷深度大;航道设施密集,航运繁忙;水陆自然生态保护要求严格。在如此复杂的工程条件下开展高速铁路越江隧道工程建设,重点对隧道结构纵向差异变形和横向变形、可靠的衬砌结构形式、超长距离独头施工和防灾疏散救援等关键技术进行研究,以指导设计、施工采取安全可靠、合理可行的工程措施,为顺利实现工程建设和运营安全的工程目标起支撑作用。

The proposed Shanghai-Chongqing-Chengdu High-speed railway will enter the underground at Qiyakou,Taicang,Jiangsu Province,then tunnel through the southern branch of the Yangtze River,which is about 10.5 km wide,and come up to the surface at Wan'an village of Chongming Island in Shanghai.The 14.22 km Yangtze River Tunnel in Chongtai crossing the South Branch of the Yangtze River has the maximum underwater depth of 87 m and the maximum underground depth of 50.5 m.The shield section of the tunnel is about 13.12 km and the outer diameter is about 15.2 m.It is planned to be a single-hole double-line tunnel and the designed maximum driving speed is 350 km/h and.This engineering project is close to the Yangtze River Estuary.Its riverbed is spongy sediment intertwined with runoff and tide.Yangtze River is wide and deep and has large scour depth.The waterway facilities are densely distributed and the shipping is busy.The requirement of water and land ecological protection is strict.In order to carry out this cross-river tunnel project of high-speed railway under such complex engineering conditions,it is necessary to focus on the key technologies to cope with such problems as longitudinal differential deformation and transverse deformation of tunnels,reliable lining structures,super-long blind heading and disaster prevention,evacuation and rescue,so as to guide the design and construction of tunnels and take reliable engineering measures to support the project construction and operation safety.