本文關鍵詞：山底隧道穿越巨厚礦渣層不良地質體的結構穩(wěn)定性分析　出處：《石家莊鐵道大學》2015年碩士論文　論文類型：學位論文

  更多相關文章： 大跨度公路隧道 巨厚礦渣層 三臺階七步開挖法 數(shù)值模擬

【摘要】：單洞三車道大跨度公路隧道斷面多呈扁平狀。不良地質段圍巖自身穩(wěn)定性較差,加之扁平大跨度隧道斷面形式的影響,施工難度比較大,而且在施工過程中圍巖極容易發(fā)生失穩(wěn)破壞。本文以山底隧道為依托,首先對穿越巨厚礦渣層的大跨度隧道的圍巖穩(wěn)定性和施工力學行為進行研究分析。對隧道所穿越區(qū)域對應的圍巖等級和各圍巖對應開挖方法進行詳細分析。其次,利用FLAC3D結合隧道工程特點建立3D數(shù)值模型,對三臺階七步開挖法開挖過程一個循環(huán)進尺各施工步隧道拱頂變形特征、拱腳水平位移以及襯砌支護結構的第一主應力情況進行模擬分析。再次,通過對隧道斷面拱頂和拱腳處的監(jiān)測數(shù)據(jù)進行回歸擬合分析,將監(jiān)測值與回歸擬合值以及數(shù)值模擬結果進行對比分析,得到回歸擬合曲線的變化規(guī)律能夠反映圍巖變形的規(guī)律特征。數(shù)值模擬結果與隧道圍巖變形基本符合,圍巖在施工過程中基本處于穩(wěn)定狀態(tài)。最后,經(jīng)分析得出對巨厚礦渣層段圍巖按照破碎帶圍巖進行處理,采用三臺階七步開挖法是合理的選擇。根據(jù)地質勘查報告和數(shù)值模擬結果采取合理的超前支護方法能夠保證圍巖穩(wěn)定,支護結構的力學變化特性均在安全允許范圍內。研究結果對類似工程具有一定的參考價值。
[Abstract]:The section of single hole and three lane long span highway tunnel is mostly flat. The stability of surrounding rock of bad geological section is poor, and the influence of plane and long span tunnel section form makes the construction difficult. Moreover, the surrounding rock is vulnerable to instability in the construction process. This paper is based on the tunnel at the bottom of the mountain. Firstly, the stability of surrounding rock and the construction mechanics behavior of the large-span tunnel through the super-thick slag layer are studied and analyzed, and the surrounding rock grade and the corresponding excavation method of each surrounding rock are analyzed in detail. . Based on the 3D numerical model of FLAC3D combined with the characteristics of tunnel engineering, the deformation characteristics of the arch roof of each step tunnel in the excavation process of three steps and seven steps are studied. The horizontal displacement of arch foot and the first principal stress of lining support structure are simulated and analyzed. Thirdly, the monitoring data of tunnel section arch roof and arch foot are analyzed by regression fitting. By comparing the monitoring value with the regression fitting value and the numerical simulation result, the variation law of the regression fitting curve can reflect the regular characteristics of the surrounding rock deformation, and the numerical simulation result is basically consistent with the surrounding rock deformation of the tunnel. The surrounding rock in the construction process is basically in a stable state. Finally, through the analysis of the extremely thick slag section of the surrounding rock in accordance with the broken zone surrounding rock treatment. The three-step seven-step excavation method is a reasonable choice. According to the geological survey report and numerical simulation results, reasonable advance support method can ensure the stability of surrounding rock. The mechanical characteristics of the supporting structure are all within the safe allowable range. The results of the study have certain reference value for similar engineering.
【學位授予單位】：石家莊鐵道大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：U451

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