What is the norm of mine construction?

Code for construction and acceptance of mine roadway engineering GBJ 2 13-90

Code for Construction and Acceptance of Roadway Engineering in Nonferrous Metals Mines (YSJ4 13-93)

Code for Construction and Acceptance of Open-pit Coal Mine Engineering (GB 50 175-93 93)

Code for construction and acceptance of building materials mine engineering JCJ 07-94

Code for construction and acceptance of YS tailings facilities 5418-95

Standard for quality inspection and evaluation of coal mine installation engineering MT 50 10-95

Mine excavation method refers to the construction method of constructing tunnels by digging underground tunnels. Mining method is a traditional construction method. Its basic principle is that after tunnel excavation, the rock mass will be broken by blasting, forming a relaxed state and may collapse at any time. Based on this relaxation load theory, the construction method is to excavate block by block according to the division order, and it is required to support while excavating for safety reasons, so the support is complicated and the wood consumption is high. With the appearance of shotcrete and anchor support, the number of divisions decreased, and later developed into NATM.