基于声速法的冲击矿压危险性预测研究

Prediction Research of Rock Burst Danger Based on Sonic Wave Measurement

为了研究冲击矿压危险性和声波速度之间的关系,建立了损伤和纵波波速之间的定量关系,并通过对红砂岩进行单轴压缩实验,验证其正确性。利用上述关系,提出了冲击矿压危险性预测的一种新方法,并对危险等级进行了划分,提出了相应的解决措施。当应力水平较低时,纵波波速缓慢上升,损伤量减少;随着载荷的增加,到达峰值的80%～90%水平时,会出现纵波波速急剧下降,损伤量快速增大的现象,预示着破坏即将来临。

To study the relationship between the rock burst danger and P-wave velocity, the quantitative relationship of damage and the P-wave velocity was established. Meanwhile, the laboratory experiments on red sandstone under uniaxial loadings were made to verify its correctness. Using the above mentioned relationship, a new method to rock bust danger forecast was presented and the rank of rock burst danger was classified. The corresponding control measures were put forward. When the stress level was low,P-wave velocity rose slowly and the amount of damage was decreased. When the load increased to be 80% - 90% of the peak level, P-wave velocity dropped sharply and the amount of damage increased quick- ly,which predicted the failure was coming.