Title page for 86322057


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Student Number 86322057
Author Yun-Wei Song(宋雲崴)
Author's Email Address No Public.
Statistics This thesis had been viewed 370 times. Download 10 times.
Department Civil Engineering
Year 1998
Semester 2
Degree Master
Type of Document Master's Thesis
Language zh-TW.Big5 Chinese
Title
Date of Defense
Page Count 140
Keyword
  • acoustic emission
  • cone resistance
  • RMS sound pressure
  • Abstract Soil classification and soil layer verification are the major applications of in-situ cone penetration tests (CPT). Generally, using an electrical piezocone, the tip resistance, sleeve friction, and pore water pressure can be logged continuously with depth during the test .With certain interpretations, profile of a site and soil type of each layer are characterized. Since cone resistance responds to soil changes within 5 to 10 tip diameters above and below the cone (the distance increases with increasing soil stiffness), there will be some imprecision in locating soil interfaces using cone resistance. This research is concerned with the acoustic noise generated during the static penetration of soils using an acoustic cone penetrometer. As the penetrometer is advanced into a soil specimen, acoustic emissions are generated by soil grains sliding and rolling over the penetrometer, sliding and rolling over one another and being crushed. These acoustic emissions are recorded by data acquisition system. With root-mean-square (RMS) calculation and Fast Fourier Transform (FFT) operation, an acoustic emission is characterized by its root-mean-square voltage and frequency spectrum. These are the major properties of acoustic emissions which are related to soil types.
    This research focuses on eliminating the affections of background noises on acoustic emissions during penetration, improving soil interface locating, and establishing relationships between soil types and acoustic emissions. The results of tests reveal that:
    1. With damping materials (sponge and silicon gel) installed in the acoustic cone penetrometer and the signal filtration program, the affections of environmental and mechanical noises can be ignored.
    2. Estimation of RMS sound pressure during penetration provides a more accurate and convenient method to locate the interface of layered soils and to predict the average grain size (D50) of each layer.
    3. Sand and clay layers can be distinguished from one to another through examinations of each frequency spectrum and its RMS sound pressure.
    4. Soil itself provides a good damping effects on environmental noises when penetrometer is advanced into the ground.
    Table of Content 第一章 緒論1
    1.1 前言1
    1.2 研究流程與架構1
    1.3 研究方法2
    1.4 論文內容2
    第二章 文獻回顧4
    2.1 圓錐貫入試驗之發展與應用4
    2.1.1 圓錐貫入試驗之概述4
    2.1.2 發展歷史4
    2.1.3 工程應用5
    2.1.4 圓錐貫入試驗之影響因素8
    2.1.5 理論基礎9
    2.1.5.1 承載力理論9
    2.1.5.2 孔穴擴張理論11
    2.1.5.3 應變路徑法12
    2.2 微音錐貫入試驗之發展13
    2.2.1 試驗設備與分析14
    2.3 標度槽之發展與應用15
    2.3.1 標度系統之發展簡介15
    2.3.2 標度砂土試體製作16
    2.3.3 標度試體邊界控制17
    2.3.4 邊界條件之影響17
    2.3.5 尺寸效應之影響18
    2.3.6 標度槽試驗之評估19
    2.4 音波量測在大地工程上之應用20
    2.4.1 聲音的特性20
    2.4.2 聲波的基本物理量20
    2.4.3 微震音放射之基本原理22
    2.4.3.1 聲射22
    2.4.3.2 岩石聲射之應用23
    2.4.3.3 聲射於土壤力學上之應用23
    第三章 試驗土樣、儀器設備及試驗方法44
    3.1 試驗土樣44
    3.2 試驗儀器及相關設備45
    3.2.1 反力式貫入儀45
    3.2.2 微音錐貫入儀45
    3.2.3 剛性壓力式標度槽46
    3.2.3.1 壓力室配置47
    3.2.3.2 加壓設備47
    3.2.3.3 輔助設備48
    3.2.4 室內大型土槽48
    3.2.5 音波量測系統48
    3.2.5.1 微震音波量測主體49
    3.2.5.2 電源供應系統51
    3.2.5.3 資料擷取系統51
    3.2.6 移動式霣降儀51
    3.2.7 改良夯實試驗夯錘52
    3.3 試體製作52
    3.3.1 標度槽砂土試體製作52
    3.3.2 標度槽黏土試體製作54
    3.3.3 標度槽中砂土-黏土互層試體製作54
    3.3.4 大型土槽砂土-黏土互層試體之準備55
    3.4 試驗方法與步驟56
    3.4.1 黏土試體密度之決定56
    3.4.2 砂土最大與最小乾密度試驗56
    3.4.3 微音錐貫入試驗57
    3.4.3.1 音源噪音與背景噪音57
    3.4.3.2 標度槽均勻黏土試體試驗59
    3.4.3.3 標度槽均勻砂土試體試驗59
    3.4.3.4 標度槽砂土-黏土互層試體試驗60
    3.4.3.5 室內大型土槽砂土-黏土試體試驗60
    3.5 試驗資料處理61
    3.5.1 取樣定理61
    3.5.2 DFT和FFT之原理62
    3.5.3 FFT的參數選擇62
    3.5.4 數位訊號可能發生之誤差現象63
    3.5.5 方均根音壓與聲音振幅之換算64
    第四章 試驗結果與分析82
    4.1 背景噪音敏感度82
    4.2 微音錐所產生之機械噪音的影響與濾除82
    4.3 標度槽均勻黏土試體微音錐貫入試驗83
    4.3.1 方均根音壓計算與分析83
    4.3.2 方均根音壓與含水量之關係84
    4.3.3主要頻率、次要頻率對含水量之關係 84
    4.4 標度槽均勻砂土試體微音錐貫入試驗84
    4.5 室內大型土槽砂土-黏土互層試體微音錐貫入試驗85
    4.5.1 方均根音壓計算與分析85
    4.5.2 主要頻率隨深度變化之關係86
    4.6標度槽砂土-黏土互層試體微音錐貫入試驗 86
    4.6.1標度槽砂土-黏土互層試體Ⅰ 86
    4.6.1.1方均根音壓計算與分析 86
    4.6.1.2主要頻率隨深度變化之關係 87
    4.6.1.3錐尖阻抗 88
    4.6.2標度槽砂土-黏土互層試體Ⅱ 88
    4.6.2.1方均根音壓計算與分析 88
    4.6.2.2主要頻率隨深度變化之關係 89
    第五章 結論與建議133
    5.1 結論133
    5.2 建議134
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