Title page for 89322063


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Student Number 89322063
Author Chia-Ming Kuo(郭家銘)
Author's Email Address No Public.
Statistics This thesis had been viewed 2109 times. Download 1178 times.
Department Civil Engineering
Year 2001
Semester 2
Degree Master
Type of Document Master's Thesis
Language zh-TW.Big5 Chinese
Title Ground Deformations and Piles Reponses Due to Tunnelling in Sandy Ground
Date of Defense 2002-07-04
Page Count 226
Keyword
  • Ground deformations
  • Ground loss
  • Piles
  • Sandy ground
  • Surface and subsurface settlement through
  • Tunnels
  • Abstract Tunnels are driven nearby or underpass buildings as closely as possible due to the difficulty of land use in rapid transit system construction projects in urban areas. The stress relaxation due to the close of tail voids for tunnels in soft soils may cause the ground deformations around the tunnel. The ground deformations (including lateral and vertical soil movements) will damage nearby buildings and building protection measures must be properly taken during constructions. The load transfer mechanisms of the piles embedded in the movable soils are considerably complex and need to study in detail.
    A series of centrifuge model tests have been performed to assess tunnelling-induced ground deformations in sandy ground and their effects on adjacent pile foundations. Two topics have been investigated in this study. First of all, the free-field ground deformations induced by tunneling in sandy ground have been measured. Secondly, the load transfer mechanism (such as bending moment, axial force and pile head deformation) of the piles has been analyzed in the different conditions, including the cover-to-depth ratios, and the distance of the pile and the tunnel.
    When the measured ground loss induced by tunneling in sandy ground is greater than 3.5%, a large quantity ground loss will be caused violently. The result displays that the time of collapse in sandy tunnels will arise in the twinkling of an eye. In addition, when the ground loss is less than 3.5%, the bending moment and axial force of the nearby pile foundations have been occurred rapidly.
    Table of Content 目錄
    中 文 摘 要I
    英 文 摘 要II
    目 錄….III
    表 目 錄V
    圖 目 錄VI
    照 片 目 錄XII
    符 號 說 明XIII
    第一章緒論 ……………………………………………......1
    1-1緣起1
    1-2研究動機2
    1-3研究架構4
    1-4論文內容5
    第二章 文獻回顧7
    2-1軟地通隧引致之地盤沉陷7
    2-1-1地盤沉陷之原因7
    2-1-2地表沉陷分佈型態9
    2-1-3最大地表沉陷量和土壤漏失量13
    2-1-4地下土層之沉陷分佈型態及地盤變位21
    2-1-5砂土層中之離心隧道模型試驗25
    2-2側向土壤移動對樁基處的影響之相關研究27
    2-2-1基樁承受側向土壓力之數值分析方法28
    2-2-2基樁承受側向土壓力之模型試驗32
    2-4軟地通隧對鄰近樁基礎的影響之相關研究34
    2-5離心模型基本原理37
    2-5-1離心模型之基本相似律38
    2-5-2離心模型試驗之模型模擬41
    第三章 試驗土樣、儀器設備及試驗方法74
    3-1試驗土樣74
    3-2試驗儀器及相關設備74
    3-2-1地工離心機74
    3-2-2模型試驗箱75
    3-2-3移動式霣降機76
    3-2-4其他量測工具76
    3-3試體準備及模型製作77
    3-3-1模型計測樁之製作及彎矩和軸向力校正77
    3-3-2試體製作79
    3-3-3位移標線計埋設、模型隧道及有色砂製作80
    3-4試驗方法與步驟81
    第四章 試體性質與彎矩分佈曲線迴歸分析方法……….104
    4-1石英細砂之內摩擦角104
    4-2模型基樁之基本性質106
    4-3樁身彎矩分佈曲線迴歸方法之選擇107
    4-3-1三次多項式函數法107
    第五章 試驗結果與分析118
    5-1離心模型試驗類別118
    5-2離心模型試驗重複性之驗證120
    5-3砂土單隧道模擬試驗之結果與分析122
    5-3-1隧道穩定性123
    5-3-2地表沉陷槽126
    5-3-3最大地表沉陷與隧道頂拱變形127
    5-3-4土壤漏失量130
    5-3-5沉陷槽寬度132
    5-3-6隧道破壞型態與周圍地盤變位133
    5-4通隧對鄰近基樁的影響試驗分析136
    5-4-1樁身彎矩分佈137
    5-4-2樁身軸向力分佈142
    5-4-3樁頭變位146
    5-4-4不同水平距離下之基樁力學反應148
    第六章 結論與建議………………………………………..211
    參考文獻216
    附錄A最大及最小乾密度試驗222
    附錄B直接剪力試驗225
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    Advisor
  • Chung-Jung Lee(李崇正)
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    Date of Submission 2002-07-16

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