针对长江口复杂环境下建设高速铁路特长越江隧道面临的重难点问题和技术难题，以沪渝蓉高铁崇太长江隧道为背景，结合工程建设条件开展了越江隧道线位、纵断面布置、隧道分合修、衬砌结构选型、施工组织和运营防灾疏散等方案分析和论证。在河床河槽稳定性分析的基础上，通过技术、经济比较，推荐采用七丫口通道隧址方案，对河床局部深潭采取绕避措施；在分析河床地形、河底冲刷、地质条件和锚击影响的基础上，提出V形坡纵断面布置方案和越江隧道埋深控制原则；经过技术、经济比较，推荐采用单洞双线大断面盾构隧道；根据局部河床冲刷影响分析结果，采用“预制管片衬砌+现浇内衬”复合式双层衬砌结构；按照“保护环境、风险可控、动态调整”的原则，提出采用2台盾构下穿长江独头掘进的施工组织设计方案；利用竖井和盾构轨下通道，在隧道洞身范围设计紧急出口、轨下疏散通道和待避区，制定了“以疏散为主、安全待避、快速救援”的隧道防灾疏散预案。
王乐明
,
唐国荣
,
孟庆余
,
马志富
,
巩江峰
. Overall Design of Chongming-Taicang Yangtze River Crossing Tunnel of Shanghai-Chongqing-Chengdu High-Speed Railway（沪渝蓉高铁崇太长江隧道总体设计方案研究）[J]. 隧道建设, 2023
, 43(12)
: 2098
-2113
.
DOI: 10.3973/j.issn.2096-4498.2023.12.012
The location, longitudinal profile, mode (doubletrack
tunnel tube or twin singletrack tunnel tubes), lining
structure, construction organization, and disaster prevention and evacuation of
ChongmingTaicang Yangtze river crossing tunnel of ShanghaiChongqingChengdu highspeed railway are studied: (1) The Qiyakou tunnel location is
recommended on the basis of analysis on the stability of the riverbed and by
means of technical and economic comparisons. (2) A Vshaped
longitudinal profile of the tunnel and the principle of controlling the
overburden of the river crossing tunnel are proposed on the basis of analyzing
the topographical conditions, scouring conditions, geological conditions, and
ship anchorage impact of the riverbed. (3) Largediameter
doubletrack shield tunnel is proposed after technical
and economic comparisons. (4) Composite doublelayer
lining structure consisting of prefabricated segment lining and castinsitu concrete lining is proposed on basis
of analysis on the impact of the scouring of the riverbed at local areas. (5)
Two shield machines are proposed for the construction of the tunnel according
to the principle of "environmental protection, controllable risks and
dynamic adjustment". (6) Emergency exits, undertrack
evacuation passages, and refuge areas are arranged for the tunnel by using the
vertical shafts and the space under the track.
