Pingdingshan Coal Mine Project

Customized TBM enhances coal mine roadway construction

This project is a gas control roadway with a total tunnelling length of over 15 kilometers. The tunnel construction is faced with a series of difficulties, such as large overburden (at an elevation of -760 m), high crustal stress, abundant fault structural planes, short self-stabilization time of regional roadways, high ground temperature (43℃) and multiple curve with ultra-small radius. CREG has customized a Φ4.33 m coal mine TBM to improve the tunnelling efficiency and reduce the labor intensity of workers. Since launched in September 2021, the TBM has completed tunnelling in large gradient and small curve radius and achieved a best monthly advance rate of 623 m.

Project Background

Compared with the drill and blast method, TBM construction boasts advantages of less disturbance to the surrounding rock, better overall integrity of tunnel and a shorter construction period. The roadway excavation efficiency is 6-8 times that of a traditional method.

The TBM is boring steadily, advancing over 600 m in a month.

The TBM is ready to bore a 15 km long tunnel with a maximum overburden of 760 m.