Physics of Mining Essay -- physics mining miner

Mining is a necessary comp anent of the world we live in and it has been practiced for thousands of years. The mine industry produces billions of tons of raw product every year. The process of tap is very complicated and involves plenty of physics Two main components of the mine cycle be Drilling, and Blasting. Some important factors in mining are the pillars, flutter elasticity, and the slope stability of the ground being mined. A introductory method for destroying rock is mechanically induced stress, such as drills and eating away jets. A turbine drill for example, uses a turbine to rotate a diamond face up cutter wheel. The power output, p, can be calculated using the par p=2 NT where N is the rotational speed of the turbine and T is the tortuosity on the cutter wheel. As the rotary speed increases, the torque decreases. The maximal power output of a turbine drill is when the rotary speed is surrounded by 5,000 and 10,000 rev/min.Erosion jets can be classified as first base speed or high speed. The low speed jets use fractious particles, such as sand to erode rock at 10 to 200 m/s and the high speed jets use pee at 200 to 1,000 m/s. The high speed jets are utilise for the hardest rock and require pressures up to 5,000 kg/cmIn underground, non scorch mining, the excavation of rock is done largely by conventional percussive drills. These break the rock by indentation. The drilling machine applies a push up to the drill bit, giving it a f number which hits the rock and causes it to break. The equation for the broadside stress induced by the drill bit on the rock is as follows = cv, where is the maximum stress induced, and , c, and v are the density, compressional wave length, and velocity of the drill bit, respectively.In coal mining, ... ... Now there is an added ability from the weewee called pore pressure and the normal force is decreased making the slope more likely to fail. The following diagram represents this scenario with W as th e gravitational force downward of the upper rock, p as the pore pressure from the water, and A as the field that the water affects. Mines are erected by pillars, which have factors of safety. The factor of safety is the middling strength divided by the average stress ratio. When this ration move below 1.00, there is pillar instability. If one pillar in a mine dedicates, the result is greater force acting on the substitute which in turn increases their stress and decreases their factors of safety. If all of the pillars are highly stressed, one pillar failure could lead to a domino effect and the collapse of a mine. 1.60 is considered a good factor of safety for pillars.