| Tunnel construction in recent years,our country has developed rapidly,the number of the tunnel is increasing,the length is getting longer and longer at the same time to build more difficult,the complex geological disasters and geological situation of advanced geological forecast technology as a way to advance forecasting method of geological disaster,ahead of the tunnel construction has important significance in practical engineering,the Rayleigh surface wave is often regarded as interference wave,but because of its high energy acquisition convenient and has the advantages of speed dispersion,make its have used for advance geological prediction technologies may decorate relatively cumbersome traditional advance geological forecast system,restricted by space In view of this shortcoming,the application of Rayleigh surface wave in advanced geological prediction is studied as follows:(1)The widely used TSP203 instrument was used to conduct advanced geological prediction on the front of the palmface,and various model parameters needed for the later two-dimensional numerical simulation were extracted.In the same palmface,the field percussion experiment was conducted,and the elliptic polarization trajectory diagram and long and short axis curve were obtained by MATLAB program.Using F-K method and phase difference method,the velocity-frequency dispersion curve map is obtained.(2)The 2d simulation study of tunnel seismic wave field was carried out by using the finite element software ANSYS,and the parameters such as shear wave velocity and longitudinal wave velocity were determined by TSP.The focal point and the receiving point are set at the same position in the field percussion experiment.(3)The time record of seismic wave obtained by numerical simulation,and the elliptic polarization trajectory chart and the curve of long and short axes obtained by MATLAB program;F-k method and phase difference method were used to obtain the velocity and frequency dispersion curves. |
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