For the sake of land conservation, straightening of the line and technical safety, the bridge-tunnel ratio of the mainland high-speed railway is generally very high. As a result, some control tunnel and bridge works often need to be started first to ensure that the entire railway is built as planned. Since they are control projects, these bridge and tunnel projects are often complicated in the process of schematic design and construction, which also leads to uncertainty in the process of their advancement.
Once these bridge and tunnel projects are not carried out on schedule, the entire railway process will be affected. If repeated arguments are made in the scheme stage, it will affect the start of construction, and if there is a large uncertainty during construction, it will affect the breakthrough. In this article, we will focus on 5 railways that have been delayed due to tunnels, of which 4 are still under construction and 1 is yet to be started.
Beijing section of the Jingtang Intercity Railway
First of all, the railways that are still under construction due to the impact of the tunnel project, one of which is the Jingtang Intercity Railway, which connects the sub-center of Beijing and Tangshan City, Hebei Province, the high-speed railway actually only opened the Yanjiao-Tangshan section, and the Beijing section has not yet been completed.
In fact, the main line of the Beijing section of the Beijing-Tangzhou Intercity Railway is about 9 kilometers long and is constructed in two sections, in addition to the 4.6-kilometer section that has been opened, there are still 4.4 kilometers of Beijing sub-center tunnel under construction. In fact, the tunnel was officially excavated only last year, and has now entered the shield stage, and it is planned to be ready for opening by the end of 2025.
As the "last kilometer" of the Beijing-Tangzhou intercity railway, after the completion of the whole line, it will open up the intercity passage from Beijing Tongzhou to Tangshan.
Shanshan high-speed railway
There is also a Shantou high-speed railway, connecting Shantou City and Shanwei City, the high-speed railway has been opened is Shantou South to Shanwei section, and Shantou South to Shantou section before said that it is planned to be completed this year, but according to the current progress of Shantou Bay undersea tunnel project, the section is expected to be officially opened in the first half of next year.
In fact, the subgrade engineering of the Shantou south to Shantou section of the earthwork and stone work, bridge engineering, etc. have been completed, and the key control project of the whole line - Shantou Bay Submarine Tunnel is currently in the sea mine section, shield section construction, it is planned to be completed by the end of March next year, which also means that the high-speed railway from Shantou south to Shantou will not be able to penetrate the whole line until that time.
Sichuan-Qingdao Railway
Sichuan-Qingdao railway is also one of them, connecting Chengdu and Huangshengguan of the national railway I. class two-line passenger and freight railway, the new line in the Qingbaijiang to Zhenjiang section has been opened, but last year affected by the progress of the Desheng (formerly Yuntunbao) tunnel, Zhenjiang Pass to Huangshengguan section was postponed to this year.
At present, the section is still speeding up construction, judging from the public information, and strive to open before the National Day this year, when the bullet train can be driven to Jiuzhaigou and Huangshengguan.
Dalui Railway
The Dali railway is also due to the tunnel and affect the whole line of the railway, the connection between Dali and Dehong in Yunnan Province of the national railway class I single-track electrified passenger and freight railway, has opened the Dabao section in advance, and the Baorui section due to the Gaoligongshan tunnel project is too complex, the actual construction period is much longer than expected, which has led to the Baorui section has not been fully completed so far.
In order to meet the transportation demand along the line, the freight function of the Baoshan-Puyi section has been opened in advance, but the passenger opening of the entire Baorui section is affected by the Gaoligongshan Tunnel, and it will still have to wait for several years. Due to the difficulty of the tunnel, only about half of the tunneling has been completed in eight years, and the breakthrough is expected to take several more years and there are uncertainties, and it is expected to be completed by the end of 2027. This also means that the Baorui section will not be completed until around 2028.
Yantai-Xiyi Intercity Railway River Crossing Tunnel Scheme
Finally, let's take a look at the high-speed rail that has been affected by the tunnel, which is the Yantai-Xiyi Intercity Railway. To be precise, the high-speed railway has been affected by the crossing of the river. Because the previous high-speed rail cross-river channel mode is a bridge mode, the planned Jiangyin Highway Railway Yangtze River Bridge project plans to adopt a long-span cable-stayed suspension cooperation system bridge scheme, but the national railway believes that the bridge scheme is extremely high, and there are technical and safety risks in the implementation, and it still needs a long time to study and demonstrate.
In order to speed up the start of the project, the high-speed railway's cross-river passage is planned to adopt a more mature tunnel scheme, so that the problem of the Yanyi high-speed railway's cross-river passage and the start of construction as soon as possible can be solved at the same time.
The cross-river tunnel is planned to enter the ground from the south side of Sunshine Avenue in Jingjiang City, cross the Yangtze River to the south, avoid the scouring groove, and go ashore on the west side of the Yangtze River Wharf of COFCO Trading Jiangsu Co., Ltd. on the south bank of the Yangtze River, and finally exit the ground on the south side of Chengzhang Road.
At present, the high-speed rail cross-river tunnel section has entered the stage of preparation and review of the relevant preconditions for preliminary design approval, and the project is expected to start construction this year.
This article was originally written by @Railway Nagging, welcome to pay attention, let us pay attention to the development of China's high-speed rail and other railway transportation! ）