煤体振动方法防治冲击地压的机理研究

 研究了一种新的冲击地压控制方法, 即煤体振动方法的机理。在实验上, 采用分形几何方法, 研究了煤体在受振后裂隙的变化规律, 发现受振后煤体的分形维数增大, 表明煤体的裂隙增加, 且经过一定振动时间后, 分形维数趋于稳定; 研究了振动对煤体力学性质的影响, 发现受振后煤体的抗压强度、弹性模量和降模量降低, 且受振时间越长或初应力水平越高, 振动对煤体力学性质的影响越明显。应用采煤工作面和巷道冲击地压的分析结果, 从理论上证明了煤体受振后煤岩体的稳定性增加。

On the Mechanism of Rockburst Prevention by Coal Mass Vibration

The mechanism of a new method for the rockburst controlcoal mass vibration is studied. In the experimental aspect, the fractal geometry method is applied to quantify the crack distribution in the coal mass, and experimental results show that the fractal dimension of the coal mass increases after the coal mass vibration, which means the number of cracks in the coal mass increases, but after the vibration lasts for a certain time, the increase of the fractal dimension will stop. The mechanical property changes of the vibrated coal mass are determined, and it is found out that the compressive strength, the elastic modulus and the postpeak modulus of the coal mass intend to decrease after vibration. The longer the vibration time and the higher the original stress level are, the more obviously the vibration will affect the mechanical properties of the coal mass. In the theoretical aspect, the analysis for the rockburst around the working face and the roadway is applied to prove that the stability of the