本文選題：山嶺隧道 + 劣化度　； 參考：《西南交通大學》2015年碩士論文

【摘要】：我國幅員遼闊,山脈眾多,地形地質條件非常復雜,這種情況在我國西部地區(qū)顯得尤為明顯。為了響應國家西部大開發(fā)的戰(zhàn)略,大力修建通往西部地區(qū)的交通線已經成為發(fā)展我國西部地區(qū)的先決條件。除過公路運輸、航空運輸外,鐵路運輸由于其成本低廉、運量大、速度快,已經成為發(fā)展西部地區(qū)的主要交通方式。在打通通往西部地區(qū)的鐵路線上,眾多山嶺隧道已經被修建完成。但是,地質條件的復雜性使得山嶺隧道更容易遭受病害襲擾且大多數(shù)山嶺隧道都是帶“劣”運營。不僅如此,西部地區(qū)也是我國地震高發(fā)地帶。本文主要著重于劣化隧道在地震荷載作用下的地震動力響應研究。本文主要完成工作如下：(1)隧道模型尺寸的確定。通過建立6倍、7倍、8倍、9倍、10倍洞徑的隧道模型,在模型底部施加橫向(X向)地震荷載(以應力形式),分別分析各個工況下隧道的動力響應。結果表明,當橫向邊界尺寸大于等于8倍洞徑時,橫向邊界尺寸對動力響應產生的影響逐漸趨于穩(wěn)定。因此,為了降低邊界對隧道動力響應結果的影響,建議取用8倍洞徑或以上作為模型的橫向尺寸。(2)基于動力強度折減法,運用FLAC3D分析劣化位于隧道不同位置時的隧道力學機理以及模型的安全性。進而分析劣化范圍不同時的隧道力學機理以及模型的安全性。當劣化分別位于拱頂、邊墻中部、仰拱中心時,模型安全系數(shù)均為0.85；模型安全系數(shù)隨著拱頂劣化范圍的擴大呈現(xiàn)出逐漸減小的趨勢。(3)第一點,基于動力強度折減法,運用FLAC3D分析不同洞型下劣化隧道結構的安全性與穩(wěn)定性。結果表明,圓形隧道安全性最好,三心圓次之,直墻拱隧道安全性最差。第二點,基于動力強度折減法,運用FLAC3D分析不同圍巖級別下,劣化隧道結構的安全性與穩(wěn)定性。結果表明,圍巖情況越好,劣化隧道的安全性也越好。第三點,基于動力強度折減法,運用FLAC3D來分析不同埋深下,劣化隧道結構的力學機理以及模型的安全性。結果表明,2倍洞徑到5倍洞徑埋深下,埋深越深,劣化隧道的安全性越好；埋深達到8倍洞徑時,其安全性較2倍洞徑埋深和5倍洞徑埋深有所降低。第四點,基于動力強度折減法,運用FLAC3D來分析不同地震波持時下,劣化隧道結構的安全性與穩(wěn)定性。結果表明,在同一個地震波持時基礎上,隨著劣化度的增加,隧道結構的安全系數(shù)越�。坏卣鸩ǔ謺r越長,襯砌結構所遭受的震害也越大。
[Abstract]:China has a vast territory, numerous mountains and complicated topography and geology, which is especially obvious in the western part of our country. In order to respond to the strategy of China's western development, it has become a prerequisite for the development of China's western region to build a transportation line leading to the western region. In addition to road transportation and air transportation, railway transportation has become the main mode of transportation in the western region because of its low cost, large volume and high speed. Many mountain tunnels have been built on the railway to the west. However, the complexity of geological conditions makes mountain tunnels more susceptible to disease and most mountain tunnels are "poorly" operated. Not only that, the western region is also a high incidence of earthquakes in China. This paper focuses on the seismic dynamic response of the degraded tunnel under seismic load. The main work of this paper is as follows: (1) the determination of tunnel model size. By establishing a tunnel model of 6 times 7 times 8 times and 9 times 9 times 10 times diameter, the lateral (X) seismic load (in the form of stress) is applied to the bottom of the model, and the dynamic response of the tunnel under each working condition is analyzed respectively. The results show that when the transverse boundary size is greater than or equal to 8 times the diameter of the hole, the influence of the transverse boundary size on the dynamic response tends to stabilize gradually. Therefore, in order to reduce the influence of the boundary on the dynamic response of the tunnel, it is suggested that 8 times diameter or more of the tunnel should be used as the transverse dimension of the model. (2) based on the dynamic strength reduction method, The mechanism of tunnel mechanics and the safety of the model are analyzed by FLAC3D. Furthermore, the mechanism of tunnel mechanics and the safety of the model are analyzed. The model safety coefficient is 0.85 when the deterioration is located in the arch roof, the middle of the side wall and the center of the inverted arch, and the model safety coefficient decreases gradually with the expansion of the deterioration range of the arch. (3) the first point is based on the dynamic strength reduction method. Using FLAC3D to analyze the safety and stability of the deteriorated tunnel structure under different hole types. The results show that the safety of circular tunnel is the best, that of triaxial tunnel is the second, and that of straight wall arch tunnel is the worst. Secondly, based on the dynamic strength reduction method, FLAC3D is used to analyze the safety and stability of the degraded tunnel structure under different surrounding rock levels. The results show that the better the surrounding rock condition, the better the safety of the deteriorated tunnel. Thirdly, based on the dynamic strength reduction method, FLAC3D is used to analyze the mechanics mechanism and the safety of the model. The results show that the deeper the tunnel is, the better the safety of the tunnel is, and when the depth of the tunnel reaches 8 times the depth of the tunnel, the safety of the tunnel is lower than that of the two times the diameter of the tunnel and the depth of 5 times the diameter of the tunnel. Fourthly, based on the dynamic strength reduction method, FLAC3D is used to analyze the safety and stability of the degraded tunnel structure under different seismic waves. The results show that, on the basis of the same seismic wave duration, with the increase of deterioration degree, the safety factor of tunnel structure is smaller, and the longer the seismic wave duration, the greater the damage to the lining structure.
【學位授予單位】：西南交通大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：U456

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