China News Service, Hefei, December 12 (Liu Honghe, Zhang Xiangping, Chen Yu) On December 10, the right line of the Huang (Shan) Qian (Island Lake) Expressway Fengchijian Tunnel, which was constructed by the Fourth Company of China Railway Fourth Bureau, was completed. So far , The tunnel in the pipe section is fully connected, laying a solid foundation for the opening of the Huangqian Expressway to traffic at the end of 2022.
It is understood that the Fengchijian Tunnel is located in Shexian County, Huangshan City, Anhui Province. The left line is 1,525 meters in length and the right line is 1,500 meters in length. It is the longest section of the entire tender and the geologically complex high-risk tunnel.
The tunnels all pass through the weathered phyllite stratum, with relatively shallow burial depth, severe bias at the entrance of the tunnel, and poor stability of the surrounding rock of the tunnel.
In addition, the rainy season in Shexian County is long, and the tunnel construction is prone to water inrush accidents, causing the tunnel to collapse.
Huang (Mountain) Qian (Island Lake) high-speed Fengchijian tunnel renderings courtesy of the Fourth Railway Bureau
"Because the stratum deposition time of some sections of the tunnel is short, the seemingly hard rock mass becomes fragmented sand after blasting, and the stability is extremely poor. After encountering water, it reconstitutes into a viscous thin mud. The construction is difficult. Safety risks are high.” said Wang Jianbin, project manager of Huangqian Expressway of the Fourth Company of China Railway No. 4 Bureau, “In order to ensure the orderly progress of construction and production, in view of the complex geological characteristics of the surrounding rock of the tunnel, we adopt advanced geological forecasting methods to master the geology and hydrology of the surrounding rock. Circumstances. Reduce the cyclic footage, adopt non-blast excavation or loose blasting to minimize the disturbance to the surrounding rock."
According to reports, the Fengchijian Tunnel is the longest tunnel in the bid section, and it is close to the Xin'an River Landscape Gallery scenic spot, which requires extremely high environmental protection.
All the staff of the project department adhere to the environmental protection concept of "no destruction is the greatest protection". All construction and production are carried out on the premise of protecting the environment, and actively explore a new model of harmonious and unified development of environmental protection and construction production. The two-line tunnel is completed safely, high-quality, and efficiently inside.
Huangqian Expressway is an important part of the national expressway G4012 Liyang-Ningde Expressway. It is also a vertical link in the "Five Vertical and Nine Horizontal" Expressway Network Plan approved by the Anhui Provincial Government. It has a total length of 25.54 kilometers and connects Huangshan Mountain and Qiandao Lake. Big gold tourist attraction.
The starting point of the project is connected with the Huihang Expressway, and the end point is at the junction of Anhui and Zhejiang provinces and the Chun'an section of Qianhuang Expressway. The opening of the highway will help accelerate the integration and development of transportation and tourism in the Yangtze River Delta.
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