Algorithm of Predicting Dynamic Surface Subsidence and Deformation for Multi-Workface Mining

In order to predict the dynamic surface subsidence and deformation, a working face was divided into some mining elements along strike according to the face advancing, and the dynamic surface subsidence and deformation was regard as the superposition of the dynamic subsidence and deformation independently of all these mining elements. There might be a section of which width was shorter than a mining element when dividing a face using equal distance method was indicated, and the section should be calculated specially in the algorithm. A model of predicting dynamic surface subsidence and deformation was established based on the generalized time function and probability integral method. A method how to divide a face and the relations among different coordinates were presented. The algorithm steps of the dynamic prediction model for multi-face mining were designed. The algorithm was implemented by using C# programming language based on .NET 2005. The algorithm was tested by the measured subsidence values of 30 monitoring points located in observation east line of some mine 1176 east working face, the result showed that the prediction results agreed well with the observation data, and the feasibility and effectiveness of the algorithm were demonstrated.