【摘要】 节理对岩体工程有重要的影响,采用应力波反演节理产状有重要的工程意义。根据解析几何理论严密推导出节理面反射波走时公式,该公式建立节理真倾向、真倾角值与测点走时的直接关系。通过复信号分析可得到信号的瞬时振幅、相位和频率,节理岩体模拟试验测得的信号分析表明,即使面波干扰严重,由瞬时频率还是能有效判断节理反射波初至时刻,得到不同测线上的测点走时,在MATLAB平台上编制程序,由这些测点走时搜寻出反射波等时圆圆心,最终能很好地反演出节理产状。更多还原

【Abstract】 The joint is crucial for rock mass engineering,so the inversion of the joint’s attitude using stress wave is of great engineering significance. Based on the theory of analytic geometry,a formula to calculate traveling time of the reflected wave can be deduced from which direct relationship between a joint’s true dip direction,true dip angle and the traveling time of measure points can be established. Through complex signal analysis,instantaneous amplitude,phase and frequency of signal can be presented. The signal obtained by the test of jointed rock mass simulation shows that despite the serious interference of Rayleigh wave,the initial arriving moment of the joint reflected wave can still be estimated by instantaneous frequency efficiently. Using the complex signal analysis,the traveling time of several measure points distributing around the source of vibration is gained. And a program based on MATLAB is written to search the center of the isochronous circle,therefore,the inversion of joint’s attitude can be achieved in the end.更多还原