Basic concept of mine pressure in mining face
The rock mass is in equilibrium before the ore body is mined. When the ore body is mined, an underground space is formed, which destroys the original stress of the rock mass, causes the rock mass to redistribute and continues until the rock body forms a new balance. During the stress redistribution process, the surrounding rock is deformed, moved, and destroyed, thereby exerting pressure on the working face, the roadway, and the surrounding rock. The force exerted by the rock movement caused by the mining process on the surrounding rock of the support is usually called mine pressure. 
A series of mechanical phenomena caused by mine pressure, such as roof sinking and slumping, floor bulging, sheet gang, bracket deformation and damage, filling sinking compression, coal rock formation and surface movement, open pit slope The phenomenon of shifting, impacting ground pressure, coal and gas outburst is called mine pressure. Therefore, mine pressure appears to be the result of mine pressure and external performance.
Chevrolet Car,Gasoline Medium Suv,Gasoline Car Chevrolet,Petrol Car Chevrolet
Chongqing Yuntu Automobile Trading Co., Ltd. , https://www.yuntuauto.com