Method and application of controlling mining speed to reduce structures damage

For reducing mining damage intensity, surface dynamic movement of mining process is controlled, the working face is considered as a system, overlying strata and surface movement are as the output of the system, the only external factor affecting the output of the system is mining speed. According to surface movemen t law, the function of surface movement and mining speed was established, mining speed affects surface horizontal movement speed and acceleration. By law of mecha nics, the main influence factor was surface horizontal movement acceleration for additional load on surface structures, and surface horizontal movement acceleration w as proportional to mining speed square. When mining speed was improved, surface movement acceleration was increasing, this caused additional load on surface struc tures and damage level of structures increasing. For reducing damage level of structures, controlling mining speed was necessary. On the basis of probability integral m ethod, optimal control model and method of controlling mining speed were proposed in mining engineering. Actual examples illustrated that reducing damage level of str uctures was effective by controlling mining speed.