Yan Jiecheng told Lao Xie a few words again about some water inrush during the construction of the new Austrian method.
The NATM itself is on the premise of using the bearing capacity of the surrounding rock itself. Millisecond blasting and smooth blasting technology are used for full face excavation.
The tunnel body is constructed by forming a composite inner and outer lining.
Because the ground stress contained in the mountain is redistributed due to the excavation of holes,
The tunnel space can be kept stable by the cavity effect, that is to say, the main bearing of in-situ stress is the surrounding rock itself, and the first shotcreting and anchoring are used