Developing of the evaluation of water inrush risk from coal seam floor

Abstract

Reviews the development process of the evaluation of water inrush risk from coal seam floor. Then the system of risk evaluation is put forward: indexes (establishment of index system), methods (selection of evaluation methods) and tools (innovation of handling tools), and the three steps are summarized. The study indicates that the development of index system is no longer the expansion of factor sets, but the treatment of non-linear relationship among factors, as well as the simplification of the two basic factor sets: mining and geological conditions. The existing methods are divided into three categories according to the logic of data processing. Based on the basic information of the data, the first type is to consider, sort, and synthesize three effects of the original data on the evaluated object: size, height, advantages and disadvantages, thus forming the evaluation result. The second type includes assessment, analysis, expansion and extension of the data, then the potential information is discovered to form the final result. The third type is to organize data sets with the same indexes, and find common information among data through related processing technology to obtain the result. The development direction of future evaluation methods covers two aspects. On the one hand, it aims to inherit the water inrush coefficient method and improve its poor performance in thick, extremely thick, and extremely thin water-resisting layers. On the other hand, it aims to innovate new methods of machine learning, then develop and apply them and their combined models. Besides,three goals that the processing tool needs to achieve are proposed:build a three-dimensional model of a mine,the realization of dynamic demonstration,positioning,quantitation and probability.The problems faced by the three parts are discussed and specific solutions are elaborated.On the basis of the above,the research prospect of all links of water inrush risk evoluation system from coal seam is globally clarified.

Keywords

• mining under pressure
• water inrush from coal seam floor
• risk evaluation
• water inrush coefficient
• neural network