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研究生:許惠綺
研究生(外文):Hui-chi Hsu
論文名稱:表面波頻譜法不同震源及落距對現場頻散曲線影響之研究
論文名稱(外文):Effects of Different Sources and Falling Distances on the Dispersion Curve of Surface Waves
指導教授:康裕明
指導教授(外文):Yu-min Kang
學位類別:碩士
校院名稱:逢甲大學
系所名稱:土木工程所
學門:工程學門
學類:土木工程學類
論文種類:學術論文
論文出版年:2007
畢業學年度:95
語文別:中文
論文頁數:262
中文關鍵詞:頻散曲線表面波頻譜法相關函數主訊/雜訊振幅比震源型式
外文關鍵詞:Coherence FunctionDispersion CurveSpectral Analysis of Surface Waves (SASW) MethodSignal/Noise AmplitudeRatioSource Type
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非破壞檢測的領域很廣泛,而表面波頻譜法在淺層震測法中具有研究價值以及工程應用之價值。許多研究文獻顯示震源能量不足、現場雜訊、低頻區相位異常等現象,會造成表面頻散曲線之異常跳動,
因此本文透過現地實驗來探討不同震源型式對於表面波頻散曲線之影響,所施測的地點為逢甲大學育樂館前草坪,實驗時進行四種震源之各種落距以及不同撞擊狀況,包括6kg應力鎚、20kg纜繩式落鎚、30kg自由落體式落鎚及100kg氣壓缸式落鎚。
研究結果顯示:(1) 四種震源中五種研究參數之排序,整體表現最優先者為30kg鎚撞擊橡膠墊之狀況。(2) 將主訊/雜訊振幅比值=20的頻率定義為「有效低切頻率」,以做為最低使用頻率,不但可以避免頻散曲線有異常跳動現象,且可有效降低各震源所獲得之波速的差異。(3) 隨著震源距離之增加,有效低切頻率會隨之增加,有效高切頻率則會隨之減小,可用有效頻寬頻訊號因而減少。(4) 隨著落距之增加,有效低切頻率有降低之趨勢,顯示出高震源能量將有助於降低有效低切頻率,而所能檢測土體的深度將隨之增加。(5)極低頻區之主訊/雜訊振幅比值高並不代表整體訊號就較高,因此為了探測更深之土體,必須提昇極低頻區之主訊/雜訊振幅比值。
There are lots of applications in the area of nondestructive testing, and the Spectral Analysis of Surface Waves (SASW) Method plays an important role in shallow seismic exploration both in academic and application areas. Many research studies showed that insufficient energy of source, noise in the field, erroneous phase information in low frequency area may cause the unusual oscillation phenomenon of the dispersion curves. The purpose of this thesis was to study the effects of source type on the dispersion curve for surface waves insitu testing. The field tests of this thesis were conducted on the lawn in front of Feng-Chia University recreation dome. Four kind of sources with different falling heights and hitting conditions were used, including 6 kg hammer, 20 kg falling hammer of the cable, 30 kg free-falling hammer, 100 kg air-pressured hammer.
The results of this research showed that: 1. the 30 kg hammer hitting a rubber pad is the best source in the four sources from the ranking information of five research parameters ; 2. with the usage of effective low-cut frequency as the lowest frequency that the signal/noise amplitude ratio exceeds 20, not only the unusual oscillation phenomenon of the dispersion curves can be avoided, but also discrepancy of the error in apparent velocity between each sources can be effectively reduced; 3. as the distance of source increases, the effective low-cut frequency will increase while the effective high-cut frequency will decrease, hence the band width of effective frequency will decrease; 4. since a lower value of the effective low-frequency can be obtained by a higher falling distance, higher source energy will be helpful to produce a lower effective low-cut frequency and a deeper investigation depth of soil stratum can be conducted; 5. a higher value of signal/noise amplitude ratio in extra-low frequency range does not indicate a higher value of the whole frequency spectrum, thus the increase of the signal/noise amplitude ratio in extra-low frequency range is a must for exploring the deeper soil stratum.
中文摘要 I
ABSTRACT III
目錄 V
圖目錄 VII
表目錄 XX
照片目錄 XXIV
符號說明 XXVI
第一章 緒論 1
§1-1 研究背景與目的 1
§1-2 研究步驟 3
§1-3 論文內容 5
第二章 文獻回顧 6
§2-1 淺層震測法之介紹 6
§2-2 表面波探測法 7
§2-3 穩態表面波頻譜法 9
§2-4 暫態表面波頻譜法 9
§2-5 相關研究成果 17
§2-6 總結 21
第三章 研究內容與研究方法 24
§3-1 前言 24
§3-2實驗設備 24
§3-3 實驗地點與測線佈置 29
§3-4數據處理 33
第四章 研究結果之討論與比較 37
§4-1各震源下時間域之討論 37
§4-2各震源下頻率域之討論 44
§4-3各震源下時間域主訊/雜訊比之討論 48
§4-4各震源下頻率域主訊/雜訊比之討論 50
§4-5各震源下相關係數之討論 53
§4-6各震源下相位差與頻散曲線之討論 59
§4-7 各震源下產生極低頻訊號之討論 73
§4-8 總結 76
第五章 結論與建議 79
§5-1 前言 79
§5-2 結論 80
§5-3 建議 81
參考文獻 82
【1】AL-Hunaidi, M. O., “Difficulties with Phase Spectrum Unwrapping in Spectral Analysis of Surface Waves Nondestructive Testing of Pavements, ” Canadian J. of Civil Engineering, Vol. 29, pp. 506-511, 1992.
【2】Joh, S.-H., Rosenclad, B.L., and Stokoe, K.H., II, “Improved Data Interpretation Method for SASW Tests at Complex Geotechnical Sites,” Proc., Seventh Inter. Offshore and Polar Engineering Conf., Honolulu, May 25-30, pp. 875-881, 1997.
【3】張德文,「表面波頻譜法檢測層狀地工系統之理論研究」,第六屆路面工程學術研討會,第381-402頁,1992。
【4】Jones, R., “Surface Wave Technique for Measuring the Elastic Properties and Thickness of Roads:Theoretical Developments,” British J. of Applied Physics, 13, pp. 21-29, 1962.
【5】秦復興、吳耀丞、康裕明,「表面波頻散曲線於層狀土體的數值模擬」,第二十五屆全國力學會議,第2017-2027頁,台中,12月,2001。
【6】Tokimatsu, K., Tamura, S., and Kojima, H., “Effects of Multiple Modes on Rayleigh Wave Dispersion Characteristics,” J. of Geotech. Engng., ASCE, Vol. 118, No 10, pp. 1529-1543, 1992.
【7】Hiltunen, D. R., and Woods, R. D., “Variables Affecting the Testing of Pavement by the Surface Waves Method,” Transportation Research Record 1260, pp.42-52, 1990.
【8】鄭丁興、溫國樑、康裕明、張道明,「地震測站波速構造調查」,94年度國家地震工程研究中心專題研究成果報告,2005。
【9】黃清林,「表面波頻散曲線異常跳動現象之探討」,逢甲大學土木工程研究所碩士論文,2004。
【10】黃永銘,「陣列式表面波頻譜法在檢測地下管之應用」,逢甲大學土木工程研究所碩士論文,2005。
【11】王哲章,「陣列式表面波頻譜法在檢測黏土剖面變化之應用」,逢甲大學土木工程研究所碩士論文,2005。
【12】莊杰龍,「表面波相位差之強健性展開」,逢甲大學土木工程研究所碩士論文,2005。
【13】陳錦銓,「雜訊對表面波頻散曲線影響之數值研究」逢甲大學土木工程研究所碩士論文,2006。
【14】康裕明,「震源能量對表面波頻散曲線的影響以及訊號改良」,94 年度國家地震中心專題研究成果報告,2005。
【15】左天雄,「連續表面波試驗及反算分析地層剪力波速」,土木技術,第二卷,第八期,第48-63頁,1999。
【16】王宗文,「以連續表面波反算土層動態參數之研究」,台灣大學土木工程研究所碩士論文,1999。
【17】Kramer, S. L., “ Geotechnical Earthquake Engineering ” , Prentice Hall, 1996.
【18】林進興、蘇百加,「表面波譜法(SASW)之實務與應用」,
地工技術,第八十六期,第19-28頁,2001。
【19】Jones, R. B., “In-Situ Measurement of the Dynamic Properties of Soil by Vibration Methods,” Journal of Geotechnical Engineering, ASCE, pp. 1-21, 1958.
【20】Menzies, B. K., and Matthews, M. C., “ The Continuous Surface -wave System: A Modern Technique for Site Investigation,” Special Lecture: Indian Geotechnical Conference ,Madras, Dec. 11-14, 1996.
【21】Matsubara, Y., Kaida, Y., Osada, M., and Takahashi, T., “High-Re solution Shallow Seismic Profiling Using Portable Vibrator,” Presented at 1994 SEG Convention, Los Angles, pp. 598-601, 1994.
【22】Matsubara, Y., Takahashi, T., Ghose, R., and Kaida, Y., “Very Shallow Subsurface Imaging Using a Portable Vibrator,” Presented at 1995 SEG Convention, Houston, pp. 415-418, 1995.
【23】康裕明,「表面波分散曲線的影響因素」,中華民國第十六屆 全國力學會議論文集,基隆,第837-843頁,1992。
【24】林盈政,「表面波譜法應用於偵測地下管線技術之初步研究」,國立成功大學土木工程研究所碩士論文,臺南,1996。
【25】陳協良,「地下孔洞震波檢測法之訊號特性與改良」,逢甲大學土木及水利工程研究所碩士論文,臺中,1998。
【26】Heisey, J. S., Stokoe, K. H.,Ⅱ and Meyer, A. H., “Moduli of Pavement Systems from Spectral Analysis of Surface Waves,” Transportation Research Record 852, pp.22-31, 1982.
【27】Nazarian, S., Stokoe, K. H.,Ⅱ, and Hudson, W. R., “Use of Spectral Analysis of Surface Waves for Determination of Surface Waves for Determination of Moduli and Thickness of Pavement Systems,” Transportation Research Record 945, 1983.
【28】Stokoe, K. H., Ⅱ, and Nazarian, S., “Effectiveness of Ground Improvement from Spectral Analysis of Surface Waves,” Proc. of Eighth European Conference on Soil Mechanics and Foundation Engineering, Helsinki, Finland, 1983.
【29】Stokoe, K. H., Ⅱ, and Nazarian, S., “In Situ Determination of Elastic Moduli of Pavement Systems by Spectral Analysis of Surface Waves Method(Practical Aspects),” Transportation Research Report 368-1F, U. of Texas at Austin, 1985.
【30】Stokoe, K. H., Ⅱ, and Nazarian, S., “In Situ Determination of Elastic Moduli of Pavement Systems by Spectral Analysis of Surface Waves Method(Theoretical Aspects),” Transportation Research Report 437-2, U. of Texas at Austin , 1986.
【31】AL-Hunaidi, M. O., “Insights on the SASW Nondestructive Testing Method,” Institute for Research in Construction, National Research Council of Canada, Ottawa, pp.940-950, 1993.
【32】Nazarian, S., and Stokoe, K. H., Ⅱ, “Use of Surface Waves in Pavement Evaluation,” Transportation Research Record 1070, 1986.
【33】秦復興,「表面波的頻射曲線於層狀系統的數值研究」,逢甲大學土木及水利工程研究所碩士論文,2001。
【34】Bay, J. A., and Stokoe, K. H.,Ⅱ,“Field Determination of Stiffness and Integrity of PCC Slabs Using SASW Method,” Proc., Nondestructive Evaluation of Civil Structures and Materials, pp. 71-85, 1990.
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