本文選題：復雜地形 + 瑞雷波　； 參考：《安徽理工大學》2017年碩士論文

【摘要】：多道瞬態(tài)面波法是近年來發(fā)展較快的一種新型近地表地震勘探方法,可以有效利用于多目標、多尺度的淺地表工程勘察應用中。瑞雷波勘探理論是基于水平界面半無限空間的理想假設條件下,但實際勘探工區(qū)地形往往比較復雜。因此,對復雜地形條件對多道瞬態(tài)瑞雷波勘探的影響以及復雜地形條件下的瑞雷面波最優(yōu)排列參數(shù)研究,是十分有意義的。論文基于多道瞬態(tài)瑞雷面波法為技術手段,構(gòu)建幾種典型的復雜地形地質(zhì)結(jié)構(gòu)模型進行有限差分數(shù)值模擬,比較頻率-速度域頻散譜,研究復雜地形條件對多道瑞雷面波法勘探的影響。本文首先介紹了瑞雷波基礎理論以及頻散特性以及彈性波場有限差分模擬理論,利用構(gòu)建單層、雙層兩類復雜地形模型模擬半無限空間條件,采用雷克子波為震源、完全吸收邊界條件,針對地形影響、最優(yōu)排列參數(shù)、震源激發(fā)位置等研究因素進行瑞雷波場正演模擬。使用頻率波數(shù)法對瑞雷面波數(shù)據(jù)進行頻散運算。通過對比單炮記錄、波場快照、頻率速度域頻散譜等模擬實驗結(jié)果,總結(jié)復雜地形條件對頻散特征的影響和復雜地形條件下最佳排列參數(shù)選擇問題。試驗結(jié)果表明:凸起地形比凹陷地形對高階頻散影響小;大道間距、長排列獲得的面波數(shù)據(jù),頻譜能量更加收斂;大道間距有利于提高頻率速度域各階波的分辨能力。最后通過根據(jù)兩組復雜地形現(xiàn)場勘探試驗,與高密度電阻率法進行綜合對比。對比發(fā)現(xiàn),與高密度電阻率法結(jié)果吻合度較高,復雜地形下面波勘探技術具有可行性。論文同時指出復雜地形條件下面波探查技術的不足以及以后的研究方向,特別是以后應該加強對復雜地形條件下瑞雷波三維有限差分模擬和時間域全波形反演的相關研究。本文研究內(nèi)容成果為復雜地形條件下多道瞬態(tài)面波法應用可能遇到的問題提供理論指導。
[Abstract]:Multi-channel transient surface wave method is a new method of near-surface seismic exploration which has been developed rapidly in recent years. It can be effectively used in the application of multi-target and multi-scale shallow surface engineering survey. Rayleigh wave exploration theory is based on the ideal assumption of semi-infinite space of horizontal interface, but the topography of practical exploration area is often more complicated. Therefore, it is of great significance to study the influence of complex terrain conditions on the exploration of multi-channel transient Rayleigh waves and the optimal arrangement parameters of Rayleigh waves under complex terrain conditions. Based on the multi-channel transient Rayleigh surface wave method, several typical complex topographic and geological structure models are constructed for finite difference numerical simulation, and the frequency-velocity domain dispersion spectra are compared. The influence of complex terrain conditions on multichannel Rayleigh surface wave exploration is studied. In this paper, the basic theory of Rayleigh wave, dispersion characteristic and finite difference simulation theory of elastic wave field are introduced. The semi-infinite space condition is simulated by constructing two kinds of complex terrain models, one is single layer and the other is double layer, and the Rayleigh wavelet is used as the source of the earthquake. The forward modeling of Rayleigh wave field is carried out according to the influence of topography, the optimal alignment parameters and the excitation location of the seismic source. Frequency wavenumber method is used to calculate Rayleigh surface wave data. By comparing the simulation results of single shot record, wave field snapshot, frequency and velocity domain dispersion spectrum, the effects of complex terrain conditions on dispersion characteristics and the selection of optimal arrangement parameters under complex terrain conditions are summarized. The experimental results show that the uplift terrain has less influence on the higher order dispersion than the concave terrain, the spectral energy of the surface wave data obtained from the distance and length arrangement of the road is more convergent, and the road spacing is conducive to the improvement of the resolution ability of each order wave in the frequency and velocity domain. Finally, based on the field exploration tests of two groups of complex terrain, a comprehensive comparison is made with the high density resistivity method. It is found that there is a good agreement with the results of high density resistivity method, and the technique of wave exploration under complex terrain is feasible. At the same time, the paper points out the shortage of surface wave exploration technology under complex terrain and the future research direction, especially the research on Rayleigh wave 3D finite difference simulation and time domain full waveform inversion should be strengthened in the future. The results of this paper provide theoretical guidance for the application of multi-channel transient surface wave method in complex terrain.
【學位授予單位】：安徽理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：P631.4

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本文編號：2015021