The technology of geological advance prediction is a necessary means and one of process during tunnel construction,and it is a key technical problem restricting the development of tunnel construction technology.The implementation of seismic wave method for advanced geological prediction of tunnels is a mechanical process.In this paper,we regard the application of seismic wave method as a mechanical trial and assume that the surrounding rock of the tunnel is a two-phase medium including solid and gas(pore).By analyzing the stress-strain relationship of the surrounding rock caused by the artificial seismic wave,the continuous equations of the incident,refraction and transmission of the seismic wave at the reflecting surface are obtained.According to the relationship between the wave impedance,the reflection coefficient and the dynamic stress of the surrounding rock,the expression of the relationship between the pressure gradient of the surrounding rock and the amplitude and frequency at different times is derived.The stress gradient of surrounding rock is regarded as one of the important indexes to evaluate the geological disaster.On this basis,a method of seismic wave advances geological prediction based on the stress information of surrounding rock is formed.Through the field seismic wave test,the stress information of surrounding rock can well express the change of geological lithology,which is proved to be accurate and reasonable and has important application value.
维普
万方数据