反射波初至时刻判断中的信号对比法

Method of Signal Comparison Used to Judge Arriving Time for Reflected Wave

在地表波动测试中,若不考虑上部岩层不均匀性,与发射点距离相等的测点上测得的振动信号理应吻合,而当某测点最先有节理面反射纵波传播至时,其振动信号就与其它测点振动信号发生偏离,故可通过信号对比判断出该测点处节理反射波初至时刻,该方法应用于实测信号,判断出的节理反射波初至时刻误差<1%.

If the upper rock is considered homogeneity, the vibration signals tested on equal-offset spots is theoretically same in ground wave test. When the wave reflected by the joint reaches one spot firstly, the vibration signal on this spot will depart from others. So we can judge the initial arriving moment for reflected wave through signal comparison. This methed was used to signals tested in one experiment indoors, and the initial arriving moment was close to the theoretic value.