冲击地压粘滑失稳机理的实验研究

MECHANISM OF INSTABILITY CAUSED BYVISCOUS SLIDING IN ROCK BURST

开展了煤岩摩擦滑动实验研究，分析了煤岩的摩擦滑动性状及摩擦滑动的稳定性，用摩擦滑动中的粘滑现象解释了冲击地压的发生机理．结果认为，煤的摩擦滑动性状与岩石具有很大差别，砂岩－煤试样在一定围压下表现为粘滑特性，说明了结构形式对摩擦滑动特性的影响是显著的；煤岩试样在摩擦滑动过程中，摩擦因数的变化是导致煤岩发生不稳定滑动或粘滑的主要原因；冲击地压是煤岩体结构摩擦滑动破坏的一种形式，表现为瞬时的粘滑失稳过程．

Frictional sliding tests of coal and rock are made in the laboratory. The behaviour and stability of coal and rock in frictional sliding are analyzed. The mechanism of rock burst is explained by viscous sliding phenomenon that takes place in the frictional sliding. It is considered that the behaviour of coal in frictional sliding is quite different from that of rock. When sandstone and coal samples are tested under a given confined pressure, viscous sliding occurs, which shows that the structure has evident effect on the properties of frictional sliding. Variation of the frictional coefficient of coal and rock in sliding is the main reason for instability sliding or viscous sliding.Rock burst is an instantaneous instability caused by viscous sliding and it is a frictional sliding caused by viscous sliding and it is a frictional sliding failure of coal and rock structure.