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研究生:洪任賢
研究生(外文):Ren-Shian Hung
論文名稱:軟弱岩石之應力應變行為
論文名稱(外文):Stress-Strain Behavior of Soft Rock
指導教授:黃安斌黃安斌引用關係
指導教授(外文):An-Bin Huang
學位類別:碩士
校院名稱:國立交通大學
系所名稱:土木工程系
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:2002
畢業學年度:90
語文別:中文
論文頁數:177
中文關鍵詞:軟弱岩石三軸實驗應力應變關係降伏行為
外文關鍵詞:Weak RockTriaxial TestStress-strain relationshipsyield behavior
相關次數:
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  • 下載下載:83
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軟弱岩石之力學特性介於土壤與岩石間,故無法完全採用土壤或岩石力學之實驗設備加以求得。為了能夠進一步瞭解台灣中北部麓山帶地區出露之『極軟弱至軟弱』岩石之力學行為,本研究使用適用於此類材料之三軸試驗裝置。此裝置之試驗能量在一般硬岩與土壤三軸試驗儀器之間,以充分滿足軟弱岩石試驗之需求,並具有飽和試體及量測孔隙水壓之裝置。三軸試體之變形採用三軸室內局部應變以及傳統三軸室外之變形量測,可以量得微應變下試體之線彈性乃至於大應變下材料之屈服行為。
本儀器系統採用局部應變量測之設計,先前學者指出軟岩在應變小於0.01%時,變形性是線性、彈性、與應變速率無關,只與壓密應力有關,此範圍內之楊氏模數 (Young’s modulus) 稱為Emax。三軸室壓與軸向壓力可以用電腦做伺服控制,以進行應力歷史控制之試驗。本研究使用此一試驗裝置對所取得之軟弱岩石試體進行了一系列之壓密不排水,應力歷史控制三軸試驗。
由研究結果顯示,三個研究地區所取得之室內三軸試體受剪時易產生高額孔隙水壓,三軸試驗中在小應變下確實呈現線彈性之行為,且隨著有效圍壓的增加,其線彈性行為會逐漸降低,隨應變量繼續增大,則顯現出非線性變形,其楊氏模數會有遞減情形發生。
The mechanical properties of soft rock are between soil and rock, It is not easy to determine these properties using the conventional soil or rock testing equipment. In order to enhance our understanding of the outcrops of very weak and young rock formations in the central and northern regions of Western Taiwan, the objective of this research projectis to use a triaxial device specifically for soft rocks. To fully fulfill its requirements, the capacity of this soft rock triaxial device lies between those designed for hard rocks and soils. The triaxial cell was equipped with local strain measurement devices and traditional external strain measurement devices capable of monitoring strains less than 0.0001 %, so that the behavior of soft rock from small strain, linear elastic state to yielding could all be observed. The axial and cell pressure could be servo-controlled independently to enable stress path controlled tests to be performed. A series of consolidated undrained, stress path controlled triaxial tests have been conducted using this test device.
From the results, it shows the triaxial test speciments from three sites when sheared, the higher pore water pressure will be generated. The results also illustrated the linear elastic behavior of the soft rock during the small strain triaxial tests, and when effect confine pressure increase the linear elastic behavior decrease. As strain increasing, it shows the non-linear strain, and the Young’s module will decrease
中文摘要 I
目錄 V
圖目錄 VIII
表目錄 XVI
符號說明…………………………………………………….……..... V
第一章 前言………………………………………………………………1
1.1研究動機……………………………………………………………1
1.2研究目的 2
1.3研究流程 3
第二章 文獻回顧 4
2.1軟弱岩石 4
2.1.1 軟弱岩石之定義 4
2.1.2軟弱岩石之種類與成因 5
2.1.3軟弱岩石之特性 6
2.2台灣中北部軟弱岩石概述 8
2.3 臺灣中北部軟弱岩石之力學性質 11
2.4軟弱岩石之受剪行為 15
2.5軟弱岩石之三軸試驗方法 22
2.5.1 軟岩用三軸系統應具備的特性 22
2.5.2 軟岩試驗方法 27
2.6 變形模數之遞減 34
第三章 研究方法與規劃 38
3.1實驗儀器 38
3.2試體來源與製作 51
3.2.1試體來源 51
3.2.2試體製作 55
3.3試驗方法 59
3.3.1三軸壓密不排水試驗(CIU) 59
3.3.2單軸壓縮試驗 60
3.3.3物性試驗 60
第四章 研究結果與討論 61
4.1基本物性試驗 61
4.2單軸壓縮試驗 71
4.3三軸壓密不排水試驗 89
4.4 彈性模數 124
4.5 軟岩現地與室內試驗性質之探討比較 132
第五章 結論與建議 145
5.1結論 145
5.2建議 146
參考文獻 147
附錄 A 交大鑽孔、寶二鑽心及大甲溪鑽心試體之分佈圖………….151
附錄 B 交大及大甲溪鑽孔地質柱狀圖…………………………...…155
附錄 C 三軸試體試驗照片……………………………………….…..168
附錄 D 軟岩破壞強度……………………………………………...…171
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