煤体振动后力学性质变化规律的试验研究

通过实验研究了煤体受振后力学性质的变化规律。采用分形几何的方法，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，表明小尺度的煤体裂隙增加，且经过一定的振动时间后，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。

An experimental study on the mechanical properties of coal mass after vibrating

The paper deals with the variation of the physical and mechanical property of coal mass after vibrating. The method of fractal geometry is applied to quantify the regularity of crack change in coal mass before and after the vibration.It is found out that the fractal dimension becomes larger after the vibration,which shows the crack number increases,and that the increase of the fractal dimension will tend to be stable after vibration of the coal mass for some time.The compressive stength,the elastic modulus and the descending modulus will get smaller after the coal mass is vibrated.The longer the vibrating time or the higher the original stress level is,the more obvious the effect of the vibration on the mechanical property of the coal mass will be .