發(fā)布時間：2018-06-27 14:19

  本文選題：雙護盾TBM + 圍巖穩(wěn)定性��； 參考：《西南交通大學》2017年碩士論文

【摘要】：與傳統(tǒng)的隧道開挖方法相比,雙護盾TBM法施工對隧道圍巖的擾動小,能夠有效的維護圍巖的自穩(wěn)能力,因此在隧道設計和施工階段可以有效利用圍巖的自穩(wěn)強度,降低支護結構的設計參數(shù),節(jié)約工程材料,也能保證施工的安全、高質。然而使用TBM開挖隧道,主要面臨的問題是隧道圍巖穩(wěn)定性能否確保TBM正常掘進,避免出現(xiàn)卡機、埋機等事故�，F(xiàn)有的圍巖分級方法大多是針對新奧法、鉆爆法等來評判隧道圍巖質量,而針對采用雙護盾TBM法開挖的隧道圍巖質量評價方法的研究較少,也不成熟。由于采用雙護盾TBM法施工導致隧道圍巖被機械和管片隔離,施工人員不能直觀的獲取隧道圍巖的地質情況,因此傳統(tǒng)的圍巖分級方法在雙護盾TBM法施工中并不適用。本文在現(xiàn)有圍巖分級基礎上,選取雙護盾TBM掘進參數(shù)、碴料參數(shù)作為隧道圍巖分級指標,基于熵權法理論計算得到TBM推力、刀具貫入度、TBM扭矩、片狀巖碴含量、塊狀巖碴含量、粉狀巖碴含量六個指標的權重值分別為0.106、0.273、0.074、0.060、0.358、0.129,建立對***隧道工程圍巖分級方法,以此來判定刀盤前方巖體情況,并結合實際開挖隧道圍巖等級進行驗證,通過熵權法理論計算得到的圍巖分級結果與實際工程中圍巖等級結果相同。因此基于熵權法理論可以對隧道圍巖分級,在掘進機開挖巖體的過程中,能夠快速、準確了解正在開挖巖體的質量情況,進而根據(jù)巖體的質量等級來指導隧道施工,及時調整安裝管片的型號。***隧道是一個深埋隧道,雙護盾TBM面臨的最大問題是圍巖的大變形,若隧道圍巖變形較大,會擠壓護盾,阻礙掘進機前行,最終導致卡機。研究隧道圍巖變形情況,結合隧道圍巖變形控制基準值,判斷圍巖的穩(wěn)定性,做好超前支護措施,保證雙護盾TBM順利掘進通過。故本文通過FLAC3D軟件模擬卡機事故段圍巖變形情況,得到隧道呈現(xiàn)四周整體向洞內收斂的特點,隧道掌子面的空間效應對附近圍巖的變形影響顯著。當雙護盾TBM不斷向前掘進,掌子面前移,使得掌子面附近的隧道圍巖變形產(chǎn)生較大變化,并遠大于圍巖的最初變形。模擬得到支護狀態(tài)下機械護盾區(qū)域拱頂圍巖最大下沉可達134.87mm,遠大于預留量,使得洞周圍巖擠壓機械護盾,阻礙掘進機向前推進。因此研究圍巖變形規(guī)律來指導雙護盾TBM施工有著重要意義。
[Abstract]:Compared with the traditional tunnel excavation method, the double shield TBM method has small disturbance to the surrounding rock of the tunnel, and can effectively maintain the stability of the surrounding rock. Therefore, the self stability strength of the surrounding rock can be effectively used in the design and construction stage of the tunnel, the design parameters of the supporting structure can be reduced, the engineering materials are saved, and the safety and quality of the construction can be ensured. The main problem is whether the stability of the surrounding rock can ensure the normal driving of the TBM, and avoid the accident of the accident. The existing surrounding rock classification methods are mostly based on the new Austrian method, drilling and blasting method and so on to judge the quality of the surrounding rock of the tunnel, and the quality evaluation method of the tunnel surrounding the tunnel by the double shield TBM method is studied. Since the construction of the tunnel surrounding rock is isolated by the mechanical and segment of the tunnel, the construction personnel can not directly obtain the geological conditions of the tunnel surrounding rock, so the traditional classification method of the surrounding rock is not suitable for the construction of the double shield TBM method. On the basis of the existing surrounding rock classification, this paper selects the double shield TBM driving parameter on the basis of the existing surrounding rock classification. According to the entropy weight method, the TBM thrust, the penetration degree of the tool, the TBM torque, the piece like rock ballast content, the massive rock ballast content, and the weight of the powdery rock ballast are 0.106,0.273,0.074,0.060,0.358,0.129 respectively, based on the entropy weight method, and the classification method of the surrounding rock of the tunnel project is established to determine the classification of the surrounding rock of the tunnel project. The rock mass in front of the cutter plate is verified by the actual excavation of the surrounding rock of the tunnel. The result of the classification of the surrounding rock obtained by the entropy weight method is the same as that in the actual project. Therefore, the entropy weight method can be used to classify the surrounding rock of the tunnel, and it can be quickly and accurately understood in the process of excavation of the rock mass. The quality of rock mass is excavated to guide the tunnel construction according to the quality grade of rock mass. The tunnel is a deep buried tunnel. The biggest problem of the double shield TBM is the large deformation of the surrounding rock. If the deformation of the tunnel surrounding rock is large, the shield will be extruded and the driving machine is hindered. The deformation of the surrounding rock, combined with the control datum of the deformation control of the tunnel surrounding rock, determines the stability of the surrounding rock, and completes the advance support measures to ensure the smooth driving of the double shield TBM. Therefore, this paper simulated the deformation of the surrounding rock of the accident section by FLAC3D software, and obtained the characteristics of the tunnel convergence to the tunnel, and the space effect of the tunnel face. The deformation of surrounding rock is significantly affected. When the double shield TBM is heading forward and the palm is moved in front of the palm, the deformation of the tunnel surrounding the tunnel is greatly changed and is far larger than the initial deformation of the surrounding rock. The maximum subsidence of the surrounding rock of the vault in the mechanical shield area under the support condition is up to 134.87mm, which is far greater than the reserve. The surrounding rock is extruded by mechanical shield, which hinders the roadheader advancing. Therefore, it is very important to study the deformation law of surrounding rock to guide the construction of double shield TBM.
【學位授予單位】：西南交通大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：U451.2

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本文編號：2074193