研究生: |
邱繼正 Ji-Jheng Ciou |
---|---|
論文名稱: |
不同初始應力作用對馬蹄形隧道於無節理與單一節理岩體中開挖之力學行為探討 The Mechanical Behavior of Horseshoe Tunnel Excavated in Intact Rock and Single Jointed Rock under Different Initial Stresses |
指導教授: |
陳志南
Chee-Nan Chen |
口試委員: |
彭桓沂
林志森 陳堯中 |
學位類別: |
碩士 Master |
系所名稱: |
工程學院 - 營建工程系 Department of Civil and Construction Engineering |
論文出版年: | 2017 |
畢業學年度: | 105 |
語文別: | 中文 |
論文頁數: | 196 |
中文關鍵詞: | 隧道 、節理 、開挖 |
外文關鍵詞: | Tunnel, Joint, Excavation |
相關次數: | 點閱:214 下載:0 |
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本研究利用UDEC軟體探討覆岩深度為300公尺之處置隧道開挖於良好之岩盤(花崗岩)中,進行全斷面開挖且無支撐打設。處置隧道為馬蹄形隧道與下方處置槽所組成,隧道共分為三階段開挖,分別為第一階段的馬蹄形隧道開挖,與下方處置槽的第二、三階段的分階降挖。首先分析馬蹄形隧道開挖於無節理岩盤之情況,接著引入一條傾角45°之節理,且通過隧道之右側角隅,就開挖伴隨之應力再分配、位移分佈與安全性評估,並延伸至三種不同初始應力(K=0.5、1、2)進行綜合對比。
本研究結果顯示當一條 45° 節理通過隧道右側角隅時,馬蹄形隧道角隅周遭在不同初始應力情況(K=0.5、1、2)與不同開挖階段均會產生張力破壞。而馬蹄形隧道在開挖穩定後,最需要注意(危險)的測點為單一節理分佈且初始應力K=2時之頂拱處,此測點於處置隧道三階段開挖中,均為安全係數最小之測點(FS=3)。
In this paper, the UDEC code was used to explore the tunnel with a depth of 300 meters. The tunnel was excavated in a hard rock (granite), and the whole section was excavated without support. Disposal tunnel composed of a horseshoe and the lower deposition hole. The tunnel is divided into three stages of excavation, a first stage is excavated for horseshoe tunnel, and a second and third stage is excavated for deposition hole. First, analyzed the tunneling of rock mass without joint, and then to discuss a 45 ° angle of the joint is through the tunnel on the right corner. The tunneling stress redistribution, displacement distribution and safety assessment of excavation and surrounding rock were investigated under K=1, and extended under three initial stresses(K=0.5,1,2)for comprehensive comparison.
The results of this paper show that when a 45 ° joint passes through the right corner of the horseshoe tunnel, the horseshoe tunnel corner around at different initial stress conditions(K=0.5,1,2)and different excavation stages will produce tension failure. And the horseshoe tunnel in the excavation steady state, the most need to pay attention to ( dangerous ) the monitoring position for a single joint distribution and the initial stress is K=2 at the top of the arch, the monitoring position in the three-stage tunnel excavation, has the minimum factor of safety(FS=3).
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