本文選題：瞬變電磁法 + 一維半空間�。� 參考：《西南交通大學》2014年碩士論文

【摘要】：瞬變電磁法是對富水不良地質體進行超前地質探測的新方法。瞬變電磁法具有對低阻地質體響應敏感的特征,因此對充泥充水溶洞、充水斷層、充泥充水破碎帶等低阻特性的地質體的預報優(yōu)勢明顯。目前基于地表半空間的瞬變電磁一維正反演已達到實用階段,但是在隧道全空間中,其反演成果與實際地質情況相差較大,研究隧道全空間瞬變電磁反演理論就很有必要。考慮隧道全空間瞬變電磁效應,并對一維半空間反演公式進行修正,使其能應用到一維全空間。論文主要開展了以研究工作： 1.論文應用數(shù)值模擬對電磁學中“煙圈效應”進行模擬,從定性和定量角度對“煙圈效應”的進行驗證； 2.應用軟件建立三維全空間模型和半空間模型,分析比較全空間和半空間瞬變電磁效應的區(qū)別和聯(lián)系,找到兩者之間的聯(lián)系； 3.利用對稱性建立模型模擬全空間和半空間瞬變電磁效應,得到大量數(shù)據(jù)進行分析,并對一維反演解析式進行修正。 通過對數(shù)值模擬結果的分析總結可得：感應渦流在半空間中如“煙圈”一樣向下向外傳播,而全空間中是以發(fā)射線圈為中心往外擴散；隧道全空間中掌子面后方瞬變電磁效應很明顯,而大地半空間中幾乎沒有感應渦流；全空間瞬變電磁效應比半空間要強烈,且存在某一個范圍內的倍數(shù)關系。
[Abstract]:Transient electromagnetic method (TEM) is a new method for advanced geological exploration of poor water-rich geological bodies. The transient electromagnetic method is sensitive to the response of low-resistivity geological bodies, so the prediction advantages of low-resistivity geological bodies such as mud-filled water-filled caverns, water-filled faults, and mud-filled water-filled broken zones are obvious. At present, the transient electromagnetic one-dimensional forward and inverse modeling based on surface half-space has reached a practical stage, but in the whole tunnel space, the inversion results are quite different from the actual geological situation, so it is necessary to study the theory of tunnel full-space transient electromagnetic inversion. Considering the transient electromagnetic effect in the tunnel, the one-dimensional half-space inversion formula is modified so that it can be applied to one-dimensional full-space. The thesis mainly carries out the research work: 1. In this paper, numerical simulation is used to simulate the "smoke ring effect" in electromagnetism, and the "smoke ring effect" is verified from the qualitative and quantitative point of view. 2. Three dimensional full-space model and half-space model are established by using software, and the difference and relation between full-space and semi-space transient electromagnetic effects are analyzed and compared, and the relationship between them is found. 3. The symmetry model is used to simulate the transient electromagnetic effects in full space and half space. A large number of data are obtained and the one-dimensional inversion solution is modified. Through the analysis and summary of the numerical simulation results, it can be concluded that the induced eddy current propagates downwards in the half-space like a "smoke ring", while in the whole space it diffuses outwards with the launching coil as the center; The transient electromagnetic effect behind the palm surface in the tunnel is obvious, but there is almost no induced eddy current in the earth half-space, and the transient electromagnetic effect in the whole space is stronger than that in the half-space, and there exists a multiple relation in a certain range.
【學位授予單位】：西南交通大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U452.11

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