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幸运新疆35选7:代寫美國留學生作業:工程實驗報告

論文編號:lw201901291022303969 所屬欄目:代寫留學生作業 發布日期:2019年01月29日 論文作者:論文網
Abstract摘要

新疆25选7开奖结果是 www.fvssn.com 這個實驗的目的是確定一個地下層的地下層結構與該壩相關的地下管道的位置。這是通過使用近地表地球物理方法進行測量來實現的,包括地面穿透雷達(GPR),電阻率斷層掃描(ERT)和激發極化(IP)。確定所選區域包括灰巖形成和粉質形成,而管道深度為0.3-0.4米。根據本研究的結果,建議一起使用GPR,ERT和IP測量來獲得地下層結構的定量和可靠數據,并且應在GPR探測中使用具有各種頻率的發射器。
The objective of this experiment was to determine the underground layer structure of a local damand thelocation of anunderground pipe related to this dam. This was achieved by measurements using near-surface geophysical methods, including ground-penetrating radar (GPR), electrical resistivity tomography (ERT) and induced polarization (IP). It was determined thatthe area selected consists ofclayey formation and silty formation, while the pipe is at a depth of 0.3-0.4 m. Based on the results of this study, it is recommended thatGPR, ERT and IP measurements should be used together to achieve quantitative and reliable data for the underground layer structures, and transmitters with various frequencies should be used in the GPR detection.

I. Introduction 導言
近地表特征,即位于陰影地下區域(通常深度小于10米)的特征,具有重要的科學和實際意義,因為它們可以作為潛在地震的指標,是生物地球化學研究的基本要素。而且,這些特征對人類活動具有顯著影響,例如有害物質的構造,隧道和存儲。因此,迫切需要容易且精確地檢測近表面特征以便于研究這些特征。近地表地球物理學(NSG)是指利用地球物理方法精確檢測近地表特征(Everett,2013)。與傳統的地球物理方法相比,NSG在幾個關鍵方面有所不同。例如,NSG提供橫向分辨率,但需要一些專業技術可能存在公共健康和安全問題。到目前為止,各種NSG方法已被應用于近地表特征的檢測,包括磁,電和電磁方法。每種方法都有其自身的優點和局限性,因此適用于不同的應用。在這些方法中,探地雷達(GPR)方法,電阻率層析成像(ERT)和誘導極化(IP)方法是最廣泛使用的方法,因為它們具有高分辨率,非侵入性和成本效益等優勢(Butler,2005) 。在該實驗中,通過GPR,ERT和IP測量壩,并且基于這些測量確定地下管的位置。
Near-surface features, namely those lying in the shadow subsurface area (typically with depth less than 10 m),areof great scientific and practical importance as they can be an indicator of potential earthquakes and are essential elements of biogeochemical study. Moreover, these featureshave a significant effect onhuman activities suchas construction, tunneling and storing of hazardous materials. Therefore, facile and precise detection of near-surface features are urgently needed to facilitate the study of these features. Near-surface geophysics (NSG) refers to the utilization of geophysical methods for precise detections of near-surface features(Everett, 2013).Compared with traditional geophysicsmethods, NSG is differentin several key aspects.For example, NSGprovides lateral resolution,though it requires some specialized techniques and may havepublic health and safety concerns.To date, a variety of NSG methods have been applied in detections ofnear-surface features, including magnetic, electric and electromagnetic methods.Each method has its own advantages and limitations, thus suitable for different applications. Among these methods, the ground penetrating radar(GPR) method, theelectrical resistivity tomography(ERT) and theinduced polarization (IP) method are most widely used ones due to their superioradvantages such as high resolution,non-invasiveness and costeffectiveness(Butler, 2005). In this experiment, the dam was measured by GPR, ERT and IP and the location of the underground pipe was determined based on these measurements.
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Table of Contents
Abstract 3
I. Introduction 4
II. Experimental Procedures 6
2.1 Measurement by ground penetrating radar (GPR) 6
2.2 Measurements by electrical resistivity tomography and induced polarization 8
III. Results and discussion 10
3.1 Ground penetrating radar 10
3.2 Electrical resistivity tomography 11
3.3 Induced polarization 12
IV. Conclusions 14
V. Recommendations 14
Appendix A 15
Appendix B 17
Appendix C 19
V. Recommendations
Based on the results of this study, several recommendations and suggestions can be given. Firstly, it is recommended that GPR, ERT and IP measurements should be used together to achieve quantitative and reliable data for the underground layer structures. GPR is a non-invasive detection method can yieldresults with superiorvertical resolution,while its depth range is highly dependent onthe electrical conductivity of theground.The ERTand IP methodsare excellent methods for the identification of transitional boundaries in subsurface layers, but are time-consuming. Then, GPR tr
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