On September 3, according to the Yangchun-Xinyi (Guangdong-Guangxi border) Expressway construction project, major progress has been made in the tunnel construction of the Yangxin Expressway. The left tube of the Bantangling Tunnel on this expressway has now been holed through, laying a solid foundation for the entire line to open to traffic on schedule.

Tunnel breakthrough site

The Yangxin Expressway is located in Yangjiang City and Maoming City, Guangdong Province. It is the western extension of the Zhongshan-Yangchun Expressway, with a total length of about 142 kilometers. It is built to a two-way, six-lane expressway standard with a design speed of 120 kilometers per hour.

It is understood that after the Yangxin Expressway is completed, it will form a rapid corridor from central western Guangdong to the central and southern areas of the Guangdong-Hong Kong-Macao Greater Bay Area, greatly shortening the road travel time from Yangchun to Xinyi, significantly improving local road freight capacity and travel conditions for people along the route, and playing an important role in improving Guangdong Province's expressway network and implementing strategic deployments such as the Guangdong Provincial Party Committee and Provincial Government's "rural revitalization strategy."

According to reports, the Bantangling Tunnel is located in Dapo Town, Gaozhou City, Maoming. Its left tube has a total length of 2,782 meters and a maximum burial depth of 225 meters, and it is designed as a separated two-way, six-lane tunnel.

The surrounding rock of the Bantangling Tunnel is mainly gneissic granite, with a large proportion of Grade IV and Grade V surrounding rock, making construction difficult and high-risk. During construction, the project team adjusted processes and methods in a timely manner according to the weak surrounding rock conditions, and adopted domestically advanced equipment and technologies such as integrated small pipe tip-shrinking and perforating equipment, wet spraying manipulators, hydraulic secondary lining trolleys, and integrated curing and inspection trolleys, achieving mechanized and intelligent construction.