Tunnel advanced detection speed modeling method based on reflected signal
A technology for advanced detection and reflection of signals, applied in seismic signal processing, measurement devices, geophysical measurements, etc., can solve the problems of imprecise theoretical analysis in practical applications, consuming a lot of manpower, material resources and time resources, saving manpower, material resources and time. Resources, reliable velocity parameters and dynamics parameters, the effect of accurate velocity modeling
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[0032] The present invention will be further described below in conjunction with the drawings.
[0033] A method for modeling advance detection speed of roadway based on reflected signal, including the following steps:
[0034] Step 1: Use conventional linear observation system to obtain X and Z component seismic signals, such as figure 1 Shown
[0035] Step 2: Determine the reflection events of i X and Z components according to the negative velocity characteristics of seismic waves, such as figure 2 Shown
[0036] Step 3: Select the X and Z component reflection wave groups of the seismic trace with the largest offset from the first reflection event axis, such as image 3 Shown
[0037] Step 4: Select a negative phase maximum amplitude time t from the above reflected wave group 1 ,Such as Figure 4 Shown, and calculate t 1 Main polarization direction θ 1 ;
[0038] Step 5. In the seismic record, select t 1 Time window of ±1 cycle length;
[0039] Step 6, assume that the velocity value is...
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