【摘要】：城市地下空間基礎(chǔ)條件問(wèn)題越來(lái)越受到重視,尤其是老城區(qū)雜亂的城市管線、巖溶分布區(qū)內(nèi)地基、病害堤壩等淺層地質(zhì)問(wèn)題所帶來(lái)的危害日趨嚴(yán)峻,因此高精度、高效率地探測(cè)淺層地質(zhì)問(wèn)題也就顯得更加重要和迫切。基于上述現(xiàn)狀和全程瞬變電磁法理論,本文針對(duì)淺層瞬變電磁勘查技術(shù)關(guān)于淺表層地質(zhì)問(wèn)題探測(cè)進(jìn)行研究。 論文在全程(全區(qū))瞬變電磁法理論基礎(chǔ)上,借助全程瞬變電磁場(chǎng)響應(yīng)模擬程序,利用后處理軟件(Voxler)對(duì)模擬數(shù)據(jù)進(jìn)行可視化處理與分析,從理論上驗(yàn)證了淺層瞬變電磁勘查方法關(guān)于淺層問(wèn)題探測(cè)的可行性和有效性。 根據(jù)淺層地質(zhì)問(wèn)題類型,通過(guò)物理模型實(shí)驗(yàn),對(duì)幾種特殊異常體(球體、圓柱體、板狀體、斷層)和淺埋高／低阻管線、建筑場(chǎng)區(qū)灰?guī)r地基的瞬變電磁感應(yīng)電動(dòng)勢(shì)變化規(guī)律及全程視電阻率擬斷面異常響應(yīng)與目標(biāo)物的對(duì)應(yīng)關(guān)系進(jìn)行模擬與討論；通過(guò)現(xiàn)場(chǎng)探測(cè)試驗(yàn)和應(yīng)用與直流電法對(duì)比,進(jìn)一步驗(yàn)證了該方法技術(shù)關(guān)于淺層地質(zhì)問(wèn)題探測(cè)領(lǐng)域的可行性和有效性。 根據(jù)模擬結(jié)果,進(jìn)行現(xiàn)場(chǎng)探測(cè)試驗(yàn),完成了淺埋隧道、拱橋、控水涵管試驗(yàn)。現(xiàn)場(chǎng)探測(cè)結(jié)果表明,淺層瞬變電磁勘查技術(shù)能夠準(zhǔn)確反映淺層目標(biāo)體埋深和空間展布特征；對(duì)高、低阻目標(biāo)體橫向定位準(zhǔn)確,低阻響應(yīng)縱向揭露埋深比實(shí)際偏大,高阻偏小,對(duì)現(xiàn)場(chǎng)探測(cè)試驗(yàn)研究具有重要指導(dǎo)意義。 論文對(duì)淺層瞬變電磁勘查技術(shù)關(guān)于低阻覆蓋層下目標(biāo)體探測(cè)存在的問(wèn)題及淺層瞬變電磁儀器發(fā)展等方面進(jìn)行了思考,為將來(lái)淺層瞬變電磁勘查技術(shù)更好地發(fā)展提供研究思路。
[Abstract]:More and more attention has been paid to the basic conditions of urban underground space, especially the hazards brought by shallow geological problems such as urban pipelines in old urban areas, inland foundations in karst distribution areas, dykes and dams, and so on. It is more important and urgent to detect shallow geological problems efficiently. Based on the present situation above and the theory of transient electromagnetic method in the whole process, this paper studies the exploration of geological problems of shallow surface layer by using transient electromagnetic survey technology in shallow layer. Based on the theory of whole (whole area) transient electromagnetic method, this paper uses the whole transient electromagnetic field response simulation program and the post processing software (Voxler) to process and analyze the simulation data visually. The feasibility and effectiveness of shallow transient electromagnetic exploration method for shallow layer problem detection are theoretically verified. According to the types of shallow geological problems and physical model experiments, several special abnormal bodies (sphere, cylinder, plate, fault) and shallow buried high / low resistance pipelines are studied. The transient electromagnetic induction electromotive force (EMF) of limestone foundation in the building field is simulated and discussed, and the relationship between the anomalous response of the whole apparent resistivity pseudo section and the object is simulated and discussed. The feasibility and effectiveness of this method in shallow geological problem detection are further verified by comparison of field detection test and application with DC method. According to the simulation results, the field detection test was carried out, and the shallow buried tunnel, arch bridge and water control culvert test were completed. The field detection results show that the shallow transient electromagnetic exploration technology can accurately reflect the buried depth and spatial distribution characteristics of shallow target body. It can be used to locate the high and low resistance objects accurately, and to reveal the depth of the buried depth in the longitudinal direction of the low resistance response is larger than the actual one, and the high resistance is smaller than that of the real object, which is of great significance to the field detection and test research. In this paper, the problems existing in the detection of objects under the low resistivity overburden and the development of the shallow transient electromagnetic instruments are considered, which provides the research ideas for the better development of the shallow transient electromagnetic exploration technology in the future.
【學(xué)位授予單位】：安徽理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：P631.325

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