Title page for 91322045


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Student Number 91322045
Author Chih-Chun Ku(古智君)
Author's Email Address s1322045@cc.ncu.edu.tw
Statistics This thesis had been viewed 1587 times. Download 1131 times.
Department Civil Engineering
Year 2003
Semester 2
Degree Master
Type of Document Master's Thesis
Language zh-TW.Big5 Chinese
Title Preparation and mechanical behaviors of macroscopically isotropic bimrocks
Date of Defense 2004-07-07
Page Count 165
Keyword
  • bimrocks
  • mélanges
  • macroscopically isotropic
  • micromechanics model
  • volumetric fraction
  • Abstract  The main purpose of this research is to study the mechanical properties and behaviors of bimrocks that composed of blocks in matrix. An uniaxial bi-directional compaction mold were designed to prepare the artificial bimrocks. By using different composite materials, the mechanical properties and behaviors with distinct block proportions and stiffnesses of the block and matrix are investigated. 
    For the testing results, the mechanical properties of bimrock are controlled by matrix itself or the interface between block and matrix in uniaxial compression. With increasing confining pressures, the global mechanical properties and behaviors are controlled by both blocks and matrix in triaxial compression. Generally, increasing of block proportions decreased the cohesion and increased the internal friction angle and the material parameter m in Hoek-Brown criteria. Based on the experimental observation, the failure modes of the artificial bimrocks at different block proportions and confining pressures can be classified into four categories: axial splitting mode; shear fracture mode; conjugate shear mode with a main shear plane, and multiple conjugate shear planes mode. For theoretical prediction, the prediction models with assuming perfectly bonded interfaces in composite materials can fit the young’s modulus of the specimens at lower block proportions in uniaxial compression, but the prediction models can’t fit the data at higher block proportions. In triaxial compression, the micromechanics model can be used to predict the test data well.
    Table of Content 目 錄
    中文摘要I
    英文摘要II
    誌  謝III
    目  錄IV
    圖 目 錄VII
    表 目 錄XVI
    第一章 緒 論1
    1.1 研究動機1
    1.2 研究內容2
    1.3 論文架構2
    第二章 文獻回顧4
    2.1 巨觀等向性併構岩之定義4
    2.2 等向性岩石之破壞準則5
    2.2.1 Mohr-Coulomb 破壞準則5
    2.2.2 Hoek-Brown (1980) 破壞準則7
    2.3 混成岩與併構岩之力學性質相關研究9
    2.3.1 波特蘭水泥混凝土之力學性質10
    2.3.2 黏性土基質材料複合土壤之力學性質13
    2.3.3 人造混成岩試體之力學性質21
    2.4 微觀力學預測模式27
    2.4.1 Voigt (1910)、Reuss (1929)模式27
    2.4.2 Hashin-Shtrikman Bounds28
    2.4.3 Self-Consistent Scheme30
    2.4.4 Differential Scheme31
    第三章 人造巨觀等向性併構岩試體之製作方法34
    3.1 等向性併構岩之模擬材料選擇34
    3.2 試驗儀器與設備38
    3.2.1 人造試體壓製模具38
    3.2.2 材料試驗機系統41
    3.2.3 岩心試體鑽修設備42
    3.2.4 資料訊號量測與擷取系統43
    3.2.5 岩石三軸試驗系統45
    3.2.6 表面影像擷取設備47
    3.3 等向性併構岩試體之製作方法及流程48
    3.3.1 材料準備49
    3.3.2 材料拌合53
    3.3.3 試體製作方法及流程55
    3.3.4 試體養護與氣乾68
    3.4 岩石力學性質試驗方法69
    3.4.1 巴西人間接張力強度試驗69
    3.4.2 單軸壓縮強度試驗69
    3.4.3 三軸壓縮強度試驗70
    3.5 單軸與三軸壓縮試驗之試體應變量測71
    3.6 岩心試體編號74
    第四章 人造巨觀等向性併構岩之力學性質及行為75
    4.1 等向性併構岩之力學性質76
    4.1.1 破壞應力與岩塊體積含量關係79
    4.1.2 楊氏模數與岩塊體積含量關係81
    4.1.3 波松比與岩塊體積含量關係83
    4.1.4 破壞應變與岩塊體積含量關係85
    4.1.5 等向性岩石破壞準則參數與岩塊體積含量關係87
    4.1.6 不同組成材料之併構岩力學性質結果比較88
    4.2 水泥加強紅土基質材料併構岩之力學性質92
    4.2.1 不同水泥添加量之紅土基質材料力學性質95
    4.2.2 破壞應力與岩塊體積含量關係97
    4.2.3 楊氏模數與岩塊體積含量關係99
    4.2.4 波松比與岩塊體積含量關係101
    4.2.5 破壞應變與岩塊體積含量關係103
    4.2.6 等向性岩石破壞準則參數與岩塊體積含量關係105
    4.2.7 不同材料勁度比之併構岩力學性質結果比較106
    4.3 人造巨觀等向性併構岩試體之破壞模態110
    第五章 微觀力學模式預測分析117
    5.1 等向性併構岩於單軸壓縮狀態下之模式分析117
    5.2 等向性併構岩於三軸壓縮狀態下之模式分析121
    5.3 預測結果比較128
    第六章 結論與建議129
    6.1 結論129
    6.2 建議131
    參考文獻132
    附錄A 人造巨觀等向性併構岩之力學試驗結果136
    附錄B 人造巨觀等向性併構岩之破壞包絡線151
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    Advisor
  • Yong-Ming Tien(田永銘)
  • Files
  • 91322045.pdf
  • approve immediately
    Date of Submission 2004-07-17

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