發(fā)布時(shí)間：2018-05-16 14:05

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

【摘要】：瞬變電磁法是對(duì)富水不良地質(zhì)體進(jìn)行超前地質(zhì)探測(cè)的新方法。瞬變電磁法具有對(duì)低阻地質(zhì)體響應(yīng)敏感的特征,因此對(duì)充泥充水溶洞、充水?dāng)鄬�、充泥充水破碎帶等低阻特性的地質(zhì)體的預(yù)報(bào)優(yōu)勢(shì)明顯。目前基于地表半空間的瞬變電磁一維正反演已達(dá)到實(shí)用階段,但是在隧道全空間中,其反演成果與實(shí)際地質(zhì)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(yīng),并對(duì)一維半空間反演公式進(jìn)行修正,使其能應(yīng)用到一維全空間。論文主要開展了以研究工作： 1.論文應(yīng)用數(shù)值模擬對(duì)電磁學(xué)中“煙圈效應(yīng)”進(jìn)行模擬,從定性和定量角度對(duì)“煙圈效應(yīng)”的進(jìn)行驗(yàn)證； 2.應(yīng)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(yīng)的區(qū)別和聯(lián)系,找到兩者之間的聯(lián)系； 3.利用對(duì)稱性建立模型模擬全空間和半空間瞬變電磁效應(yīng),得到大量數(shù)據(jù)進(jìn)行分析,并對(duì)一維反演解析式進(jìn)行修正。 通過對(duì)數(shù)值模擬結(jié)果的分析總結(jié)可得：感應(yīng)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(kuò)散；隧道全空間中掌子面后方瞬變電磁效應(yīng)很明顯,而大地半空間中幾乎沒有感應(yīng)渦流；全空間瞬變電磁效應(yīng)比半空間要強(qiáng)烈,且存在某一個(gè)范圍內(nèi)的倍數(shù)關(guān)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(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U452.11

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本文編號(hào)：1897092