Design And Implementation Of Seismic Reflection Wave Imaging Software Based On Roadbed

With the rapid development of the economy,China's investment in transportation construction is also increasing,and roadbed exploration work is receiving more and more attention from all quarters.Seismic exploration is a widely used method of roadbed exploration.Seismic reflection method is a commonly used technique in seismic exploration.The reflection wave method can detect stratigraphic changes and fluctuations.However,there are some problems in reflection wave method,such as low energy of reflection wave signal and inability to extract the velocity of reflection wave accurately.In this thesis,the imaging algorithm of seismic reflection wave is studied based on the principle of multiple reflection of common reflection points,and the reflected wave imaging software is designed.The software is tested by simulation and actual seismic data.The results of the stratigraphic section are basically consistent with the actual stratum,indicating that the software has certain application value.The main research contents of this thesis are as follows:(1)According to the reflected wave exploration principle,the seismic reflection wave is studied from the propagation and frequency domain,and the variation of the signal during the reflection wave propagation is summarized.The law is verified by simulation.(2)Based on the common reflection point imaging principle and its observation method,the research of seismic reflection wave imaging process is carried out,and the processes such as the data editing,gather sequencing,velocity analysis,motion correction,horizontal superposition,time-depth conversion are analyzed and simulated.(3)According to the seismic reflection wave imaging algorithm,the design of the reflected wave imaging software is carried out.The seismic wave SEG-Y data format is studied.The C# and MATLAB language mixed programming is used to analyze and implement each step in the imaging process.(4)In order to verify the feasibility of the imaging software,the forward modeling experiment is carried out by constructing different stratigraphic structures.The imaging results are basically consistent with the preset model.On this basis,the actual subgrade exploration data is verified,and the imaging results and the borehole survey data are obtained.A comparative analysis was carried out and the results met geophysical requirements.The simulation and actual exploration analysis data results show that the research methods and software of this thesis reach the subgrade exploration requirements and have certain engineering significance.