The reporter learned from the Chongqing-Guizhou Railway Co., Ltd. that on December 27, with the last blasting, after 1,336 days, the first water-rich karst 10,000-meter-long tunnel of the Chongqing-Qianjiang section of the Chongqing-Hunan high-speed railway, the Pingshang Tunnel, was successfully completed, laying a solid foundation for the early opening of the whole line.
Pingshang Tunnel is located in Pengshui County, Chongqing City, is a major and difficult control project of the whole line, with a total length of 10,180 meters and a design speed of 350 kilometers per hour, which is a single-hole double-lane tunnel. The tunnel is a high-risk tunnel, located in the southwest karst landform area, complex geological conditions, there are serious inlet bias, karst water-rich, coal seam gas and non-coal harmful gases and other safety risks, the maximum buried depth of 550 meters, the maximum daily water inflow of 230,000 cubic meters, for the largest water inflow and the longest tunnel in the soluble rock section of the whole line, the construction is difficult, the risk is high.
According to Gao Weimin, the project manager of the Chongqian Railway of the 12th Bureau of China Railway, in the face of the geological problems of high-pressure water-rich karst, the construction of the project adopts the tunnel construction structure form of "1 drainage tunnel + 1 horizontal tunnel + 1 flat guide + 19 horizontal channel", with a total length of 10,108 meters of auxiliary tunnels, which is the longest auxiliary tunnel of the whole line of the Chongqian Railway, and has created the longest construction record of 6,250 meters of flat guide single-head tunneling. During the construction, the project builder carefully organized and optimized and adjusted the construction method in a timely manner to safely and smoothly pass through the fault fracture zones such as the Longyang Cover Reverse Fault, the Gaogu Reverse Fault, the Xiongjiayuan Reverse Fault and the Wenfu AnticlineBy strengthening the management of advance forecasting, the safe passage of water inflow reaches 2The underground dark river of 480,000 cubic meters per hour has successfully crossed the large and small karst more than 50 times, and the largest karst cavity is 57 meters long, 45 meters wide and 40 meters high. The builder safely passed through the coal seam and gas section through manual and automatic gas monitoring.
It is understood that the Chongqing-Qianjiang section of the Chongqing-Hunan high-speed railway is an important part of the Xiamen-Chongqing channel in China's "medium and long-term railway network planning". After the completion of the project, the travel time between the Qianjiang River in Chongqing and the main urban area will be shortened from the current 4 hours to less than 1 hour, greatly improving the travel conditions of residents along the route. At that time, it will further strengthen the interconnection between the areas along the Belt and Road and the economically developed areas such as the economic zone on the west bank of the Taiwan Strait and the urban agglomeration in the middle reaches of the Yangtze River, which is of great significance for integrating tourism resources along the route, accelerating the development of the "big tourism economy" in the areas along the route, and promoting the rapid development of regional social economy.
Reporter Li Hongmiao, Zhang Bojun).