Accuracy and Stability Study of Determining Firmness Coefficient of Coal(Rocks)

The firmness coefficient of coal(rocks) is one of the most important parameters in the process of coal(rock) and gas outburst prevention and control.On the basis of theoretical analysis,this paper firstly establishes the mathematical model which is used to evaluate the determination effect of f value by pounding method,and puts forward the corresponding evaluation index.The practicality and accuracy of the model are verified by experimental results.