【摘要】：隧道圍巖穩(wěn)定性一直是國內(nèi)外工程界所廣泛關注的重要問題,國內(nèi)外專家和學者對隧道圍巖穩(wěn)定性從理論到實踐做了許多有益的探索和研究,取得了較為顯著的成果。但由于隧道工程的復雜性及現(xiàn)行隧道圍巖穩(wěn)定性理論和判別方法尚不完善,目前隧道圍巖穩(wěn)定性判別上往往理論和實際有一定的脫節(jié),主要依賴以往的工程經(jīng)驗和現(xiàn)場監(jiān)控量測反饋來判定。因此,如何依據(jù)監(jiān)測資料來判斷并受廣泛認可的公路隧道圍巖穩(wěn)定性判別標準仍是當今巖土工程界的重要課題。本文以十天高速關同隧道為依托工程,以泥質板巖隧道為工程背景,在收集現(xiàn)場大量資料和結合現(xiàn)場不同施工方法的基礎上,通過圍巖變形監(jiān)測和結合前人的研究經(jīng)驗,對關同隧道圍巖變形規(guī)律及圍巖變形與施工狀況的關系進行了較為系統(tǒng)的分析和總結,提出了關同隧道圍巖穩(wěn)定性控制基準。并結合隧道在施工過程中不同施工方法變更試驗段監(jiān)測數(shù)據(jù)分析,總結了不同施工方法的隧道變形特征及其優(yōu)缺點,提出了臺階法施工中的技術要點及變形控制措施。及針對臺階法施工中的下臺階施工普遍存在的問題進行總結,探討了針對下臺階施工的分步開挖法和跳步開挖法。主要研究成果如下:(1)結合關同隧道工程地質條件和施工狀況,通過對大量常規(guī)變形段和特殊工況段的監(jiān)測數(shù)據(jù)進行統(tǒng)計分析,總結了關同隧道圍巖變形規(guī)律及其變形與施工狀況的關系。分析結果表明,隧道圍巖的穩(wěn)定性受施工時采用的施工方法及進度影響較大,并根據(jù)關同隧道的施工狀況建立了適用于關同隧道的圍巖穩(wěn)定性控制基準。(2)通過將關同隧道施工階段的施工工法與圍巖的變形穩(wěn)定性特征相結合,分析了不同施工方法隧道圍巖的變形特征,并總結了三臺階工法施工時變形較大的原因,提出了相應的變形控制措施和施工應對措施。(3)下臺階開挖是隧道臺階法工法施工中的重要工序,通過關同隧道圍巖變形與開挖工序的相關關系分析,表明下臺階開挖引起的變形量是圍巖總變形量中極為重要的組成部分(最大可達總變形量的40%左右),且下臺階的施工直接影響隧道施工的安全性和支護結構的閉合時間及隧道的施工速度。針對此問題并結合關同隧道現(xiàn)場施工,探討了下臺階的施工方法,并分析了適用于下臺階開挖的分步開挖法和跳步開挖法的影響。
[Abstract]:The stability of tunnel surrounding rock has always been an important problem concerned by the engineering circles at home and abroad. Experts and scholars at home and abroad have made a lot of beneficial exploration and research on the stability of tunnel surrounding rock from theory to practice, and have achieved remarkable results. However, due to the complexity of tunnel engineering and the imperfect theory and method of judging the stability of tunnel surrounding rock, there is often a certain disconnection between theory and practice in judging the stability of tunnel surrounding rock at present. Mainly rely on the past engineering experience and site monitoring feedback to determine. Therefore, how to judge the stability of surrounding rock of highway tunnel based on monitoring data is still an important subject in geotechnical engineering. Based on ten days high speed Guantong tunnel and mud slate tunnel as the engineering background, this paper collects a large amount of data on the site and combines with different construction methods on the basis of monitoring the deformation of surrounding rock and combining the previous research experience. The law of surrounding rock deformation and the relation between surrounding rock deformation and construction condition of Guantong tunnel are analyzed and summarized systematically, and the control standard of surrounding rock stability of Guantong tunnel is put forward. Based on the analysis of monitoring data of different construction methods during tunnel construction, the tunnel deformation characteristics, advantages and disadvantages of different construction methods are summarized, and the technical points and deformation control measures in step method construction are put forward. This paper summarizes the common problems in the construction of the lower steps by step method, and probes into the step excavation method and the jump excavation method for the construction of the lower steps. The main research results are as follows: (1) according to the geological conditions and construction conditions of Guantong Tunnel, the monitoring data of a large number of conventional deformation sections and special working conditions are statistically analyzed. The law of surrounding rock deformation of Guantong tunnel and the relation between deformation and construction condition are summarized. The results show that the stability of surrounding rock is greatly affected by the construction method and schedule. According to the construction condition of Guantong tunnel, the stability control standard of surrounding rock is established. (2) by combining the construction method of Guantong tunnel construction stage with the deformation stability characteristics of surrounding rock, The deformation characteristics of surrounding rock of tunnel with different construction methods are analyzed, and the reasons of large deformation in construction of three-step construction method are summarized. The corresponding deformation control measures and construction countermeasures are put forward. (3) the lower step excavation is an important procedure in the construction of the tunnel step method. The correlation between the deformation of surrounding rock and the excavation procedure is analyzed. It is shown that the deformation caused by the excavation of the lower steps is an extremely important part of the total deformation of surrounding rock (the maximum deformation is about 40% of the total deformation). The construction of lower steps directly affects the safety of tunnel construction, the closing time of supporting structure and the construction speed of tunnel. Aiming at this problem and combining with the site construction of Guantong Tunnel, this paper discusses the construction methods of the lower steps, and analyzes the influence of the stepwise excavation method and the jump excavation method suitable for the lower step excavation.
【學位授予單位】：長安大學
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：U451.2

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