Principles and Prediction of Coal Seam Gas Outcrop Methods
摘要
Gas protrusion is a creeping deduction process with gas dynamics as the dominant role and coal rock body stress as the auxiliary, and compared with the disaster mechanism of impact ground pressure, it is the same shock geological disaster induced by elastic energy with dynamic characteristics presented in coal mine underground mining. However, because the gas in the coal seam has more significant rhea dynamic characteristics after being affected by mining disturbance, the elastic wave energy formed by the gas rheology in the coal rock body is more intense in the fluctuating characteristics of its energy in terms of appearance and characterization, i.e. the fluctuating characteristics of the creep process are very obvious. It can accumulate very high elastic wave energy Φ in the Ω region of the coal seam in a very short time, and with the help of coal and rock media as a bridge, it can be transmitted along the route that is easy to propagate and has the shortest path toward the vulnerable face of the mining surrounding rock. The elastic wave energy continues to impact the coal and rock media, resulting in damage to the coal and rock media damage impact effect phenomenon, the formation of the direction of the mining space directly after overcoming the medium resistance to do work W0, the remaining energy continues to pass along the selected path direction, the impact range of wave energy continues to expand, and constantly have the gas influx into the transmission path, and then continue to expand the scope of the impact to form the main channel of the main stream of the gas transmission and the impact direction, repeat the process.