project construction
Shiyashan Tunnel is the control project of Guangwu expressway. Excavation began from June 5438 to February 2005, and advanced technologies and equipment such as global positioning system (GPS) and electronic radar were adopted in the construction. During the construction, the problems of hard sandstone and a large amount of underground water explosion were eliminated, and the tunnel was successfully opened ahead of schedule without major safety accidents.
design feature
It is designed as a two-way four-lane highway tunnel with a length of 4555 meters on the left and 4606 meters on the right. It is the longest highway tunnel in Guangdong Province and the only highway tunnel with ventilation shaft.
When a disaster occurs in the tunnel, in order to facilitate the evacuation of people in the tunnel, a crosswalk is set in the tunnel to connect the left and right tunnels, with a distance of about 250m at 17, and there are also five traffic crossings with a distance of about 750m, and the center line of the traffic crossing forms an angle of 60 with the center line of the right tunnel. There is a ventilation shaft in the middle. The tunnel is located in the hilly area of Shiyashan, which belongs to the part of cloud mountains at the junction of Guangdong and Guangxi. The relative height difference of the ground in the tunnel crossing area is 392m, and the hill ridge line is obvious.
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