硬岩深孔爆破破坏范围地震波CT测试

硬岩巷道掘进工作效率受岩石硬度影响较大,采用深孔爆破可以对岩层产生不同程度的弱化作用。为了有效评价爆破弱化范围及特征,采用地震波CT测试技术,在不同开挖断面布置CT测试观测系统进行数据采集,利用SIRT反演方法获得断面波速分布结果,进一步划分爆破波速异常范围作为岩石弱化范围。实际应用结果表明,本次测试爆破孔弱化范围在0.4～1.2m,且影响程度沿钻孔自外向内有减小的趋势。该方法测试效果显著,可为爆破技术改进提供有效的技术参数。

Testing on destroying range of deep hole blasting in hard rock by seismic wave CT technology

The work efficiency of drilling in the laneway of hard rock is affected immensely by the hardness of rock. The reduction function of the rock stratum can be produced inordinately by deep hole blasting method. The seismic wave CT technology is used in the engineering to evaluate effectively the reduction range and characteristic of blasting. Through arranging the CT observing system in different excavating section the seismic wave data can be collected. Then, the result of the velocity distribution of seismic wave in section is achieved using the inversion method of SIRT. The reduction range of hard rock can be divided more according to the range of the waves velocity anomaly. The detecting practices and its results in the hard rock laneway of Huainan show that the reduction range around the blasting holes is 0.4 to 1.2m in this test. And its affecting degree of reduction along the blasting hole appears the tendency of reducing from outer to inner. The seismic wave CT technology has obvious effect in the test of reduction range, and it can provide effective technology parameters for the improvement of blasting technology in hard sandstone field.