On October 12, the left tube of the Mingyueshan Tunnel, a control project of the Kaijiang-Liangping Expressway (Sichuan section) (Kaijiang to Liangping Expressway, hereinafter referred to as the "Kailiang Expressway"), which is primarily invested by Sichuan Expressway Company under the Shudao Group, was successfully holed through, marking that the only tunnel on the entire line has achieved double-tube holing-through and sounding the charge for a full sprint toward the goal of completion and opening to traffic by the end of the year.

The reporter learned that the Kailiang Expressway starts near Qiaoting Village, Kaijiang County, Dazhou City, and ends in Liangping District, Chongqing Municipality, intersecting with the Wanda section of the G5012 Enguang Expressway. The route has a total length of 30.367 km, with an estimated investment of 3.95852 billion yuan, adopting the standard of a two-way four-lane expressway with a design speed of 100 km/h. The project is built under the BOT model, started construction in 2020, and is planned to be completed and opened to traffic by the end of 2023. At present, both the subgrade and bridge and culvert works are more than 95% complete, and construction of the pavement, traffic safety, electromechanical, and building works is being fully advanced in parallel.

Among them, the Mingyueshan Tunnel is located within Xinning Town, Kaijiang County, Dazhou City, and is arranged as separated double tubes, with a left-line length of 1,899 meters and a right-line length of 1,873 meters. It is a micro-gas tunnel, and the tunnel passes through Grade IV and Grade V weak surrounding rock, the most difficult geological conditions, with a maximum buried depth of 187 meters. The main adverse geology of the tunnel is the ancient landslide body in the portal section, and there is biased pressure in the portal section. The surrounding rock in the inlet section of the left tube is mainly clay in lithology, and the clay softens upon contact with water, resulting in extremely poor self-stabilization capacity of the surrounding rock. During excavation, soft-rock collapse and large deformation, face block falling, and sliding collapse are very likely to occur.

As one of the first five expressways planned for the Chengdu-Chongqing Twin-City Economic Circle, once the project is completed, the Kailiang Expressway will become another important transportation artery between Chengdu and Chongqing, playing a very important role in promoting the construction of the Wanda-Kai Sichuan-Chongqing coordinated development demonstration zone and injecting strong momentum into the construction of the Chengdu-Chongqing Twin-City Economic Circle.