In recent years, with the extension of coal mine at depth, rock bursts are more and frequent. Therefore, research roadway support pressure relief has become key to prevent burst. this paper, primary high strength hydraulic fracturing measures studied analysed. The emphasizes matching characteristics materials, strengthen protection active roadway, realize an integrated system. Considering stron...

In view of disasters caused by rock burst becoming more and more serious in coal mine production, three models are established for evaluation and prediction the rock burst risk based on artificial neural network. First, ten indicators are determined which have a larger influence on rock burst. Then two back propagation network models are trained using the original data and the processed data re...

Abstract To accurately predict coal burst hazards and estimate the failure of pillars in underground mining systems, it is great significance to understand mechanical behavior coal-rock bimaterial composite structures. This paper presents experimental numerical investigations on response rock-coal, coal-rock, rock-coal-rock structures under triaxial compression. The compression experiments are ...

Abstract Directional fracturing is fundamental to weakening the hard roof in mine. However, due significant stress disturbance mine, principal stresses present complicated and unmeasurable. Consequently, designed hydraulic fracture (HF) extension path always oblique stresses. Then, HF will deflecting propagation, which restrict weakness of roof. In this work, we proposed an approach drive propa...

Subject analysis of the potential of spontaneous combustion in coal layers with analytical and numerical methods has been always considered as a difficult task because of the complexity of the coal behavior and the number of factors influencing it. Empirical methods, due to accounting for certain and specific factors, have not accuracy and efficiency for all positions. The Rock Engineering Syst...

The mechanism of cutting process of roadheader with cutting head was researched, and the influences of properties of coal and rock on cutting load were deeply analyzed. Aimed at the defects of traditional calculation method of cutting load on fully expressing the complex cutting process of cutting head, the method of finite element simulation was proposed to simulate the dynamic cutting process...