| 姓名 | 尤志文(Chih-Wen yu) | 電子郵件信箱 | s9311641@cyut.edu.tw | |
| 畢業系所 | 營建工程系碩士班(Department and Graduate Institute of Constrction Engineering) | |||
| 畢業學位 | 碩士(Master) | 畢業時期 | 94學年第2學期 | |
| 論文名稱(中) | 開挖過程中卵礫石隧道斷面變形行為研究 | |||
| 論文名稱(英) | A study of deformation behaviors of gravel tunnel during excavation procedure | |||
| 檔案 |
請遵守中華民國著作權法之相關規定，切勿任意重製、散佈、改作、轉貼、播送，以免觸法。 |
論文使用權限 | 校內外均一年後公開 | |
| 論文語文/頁數 | 中文/101 | |||
| 摘要(中) | 本研究以東西向快速公路漢寶草屯線八卦山隧道為案例，隧道開挖為分段開挖，其影響隧道開挖面變形主要因素為湧水問題及軟弱土層。故本研究配合現場監測資料以電腦程式進行數值模擬。 本研究分析結果為：（1）研究地區礫石地層反算參數約為 E＝360∼410MPa；C＝0.02MPa∼0.019 MPa；ψ＝40°。（2）由現地資料整理得知，上半斷開挖後之變形量已佔了全斷面開挖後變形量的70∼80％。（3）折減力學參數發現隧道變形量由E值控制，隨著E值由360MPa折減至72MPa時則各點變形量平均增加2至3倍。（4）經由分析發現地下水位於地表下5m及頂拱上方25m時隧道開挖於上半部時就已經破壞；若降至頂拱及側壁時雖然隧道開挖處於穩定但需再作降水處理使開挖面更趨於穩定；若降低至開挖面底下時，地下水便對隧道變形影響不大，其變形量更只有水位在側壁之20％左右。 | |||
| 摘要(英) | In order to study
deformation behavior of gravel tunnels during evcavation procedures, in
which groundwater seepage and weak soil/rock formation are the two
greatest controlling factors; this research used the P-Q Shan tunnel
along the East-West expressway in Central Taiwan. The study was
conducted with in-situ deformation monitoring data and computer
numerical simulation using FLAC program. The results of the study revealed the following: (1) In the study area, the dominant mechanical parameters of the gravel deposits are: E＝360-400 Mpa; C＝0.019-0.020 Mpa;ψ＝40°. (2) Deformations occurred during the upper-half excavation attribute to 70-80% of the total deformation from the entire excavation procedure. (3) The effects of mechanic parameter reduction due to excavation disturbance on deformations are dominated by modulus "E." Reducing E from 360 Mpa to 72 Mpa resulted in up to a three-time increase of deformations at selected points over the excavation section. (4) The deformations during the upper-half excavation already reached "failure" conditions before the start of the lower half excavation when groundwater tables are five meters below the ground surface and 25 meters above the top of the tunnel excavation. However, as the groundwater table was lowered to or below the top of the excavation, the deformations stabilized before "failure." Lastly, groundwater below the bottom of the excavation, compared to groundwater alongside the excavation, exhibits insignificant effects on deformation (less than 20%). | |||
| 關鍵字(中) |
|
關鍵字(英) |
| |
| 指導教授 |
| |||