本文關(guān)鍵詞： 軟弱圍巖 隧道 數(shù)值分析 監(jiān)控量測(cè)　出處：《蘭州交通大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著城際軌道交通及城市軌道交通不斷的發(fā)展,當(dāng)線路通過(guò)城市為不占有地上資源及降噪等因素,通常采用地下通過(guò)方式。隨之面臨城市地下地質(zhì)條件的復(fù)雜多變性、地上環(huán)境的特殊性、隧道埋深較淺等問(wèn)題,對(duì)城市地下隧道工程施工帶來(lái)較大困難,尤其軟巖段隧道施工所承擔(dān)的施工風(fēng)險(xiǎn)更高。本文針對(duì)莞惠城際軌道交通某1、2號(hào)豎井區(qū)間軟巖隧道依次使用的CD、CRD、新工法進(jìn)行對(duì)比分析研究,主要研究?jī)?nèi)容如下:(1)通過(guò)對(duì)1、2豎井區(qū)間的現(xiàn)場(chǎng)資料及國(guó)內(nèi)外知名軟巖隧道事例分析,總結(jié)了引起軟巖隧道圍巖變形及破壞特性。(2)通過(guò)MIDAS/GTS軟件模擬該區(qū)間軟巖隧道所采用三種工法的施工開(kāi)挖過(guò)程,對(duì)隧道Y方向的拱頂沉降、X方向拱腰及邊墻的水平位移、塑性區(qū)影響和初期支護(hù)結(jié)構(gòu)(拱架和錨桿)進(jìn)行分析,CD工法不適合該段軟巖隧道的施工。CRD、新工法能滿足該段的施工,但是拱頂沉降變化較大及新工法存在結(jié)構(gòu)應(yīng)力集中問(wèn)題。(3)通過(guò)對(duì)三種工法的數(shù)值模擬結(jié)果和實(shí)測(cè)數(shù)據(jù)的對(duì)比分析,可以看出圍巖變形的模擬結(jié)果和實(shí)測(cè)數(shù)據(jù)的變化趨勢(shì)符合圍巖變形的規(guī)律,對(duì)模擬所采用的開(kāi)挖與圍巖的變形關(guān)系能夠指導(dǎo)施工。(4)通過(guò)對(duì)拱頂沉降和周邊位移的實(shí)測(cè)數(shù)據(jù)進(jìn)行曲線擬合,分析得該區(qū)間軟巖隧道在采用CRD工法和新工法封閉成環(huán)后圍巖變形趨于穩(wěn)定,可以施作二次襯砌。(5)針對(duì)新工法在施工中能夠更好、更安全的實(shí)施,對(duì)新工法存在拱頂沉降較大及結(jié)構(gòu)應(yīng)力集中問(wèn)題采取技術(shù)安全控制措施及管理安全控制措施。通過(guò)采用全斷面注漿、改變開(kāi)挖方法、豎向支撐法等能有效的降低施工安全隱患。
[Abstract]:With the continuous development of intercity rail transit and urban rail transit, when the line passes through the city for the non-occupation of land resources and noise reduction and other factors. In general, the underground passage mode is often adopted. Then it faces the complex variability of the urban underground geological conditions, the particularity of the above ground environment, the shallow depth of the tunnel, and so on, which brings great difficulties to the construction of the urban underground tunnel project. Especially, the construction risk of soft rock tunnel is higher. This paper makes a comparative analysis and research on the new construction method for the soft rock tunnel of Guanghui Intercity Rail Transit (Guanghui Intercity Rail Transit), which is used successively in the soft rock tunnel of No. 1 and No. 2 Shaft Shaft. The main research contents are as follows: (1) based on the field data of 1Q2 shaft section and the case analysis of famous soft rock tunnel at home and abroad. The deformation and failure characteristics of surrounding rock caused by soft rock tunnel are summarized. The excavation process of three kinds of construction methods used in soft rock tunnel is simulated by MIDAS/GTS software. The horizontal displacement, plastic zone influence and initial supporting structure (arch frame and anchor rod) of the tunnel Y-direction vault settlement and X-direction arch waist and side wall are analyzed. CD method is not suitable for the construction of soft rock tunnel. The new method can meet the construction of this section. However, the settlement of the arch roof changes greatly and the stress concentration problem exists in the new construction method. The numerical simulation results of the three methods and the measured data are compared and analyzed through the comparison and analysis of the numerical simulation results and the measured data of the three methods. It can be seen that the variation trend of the simulated results and the measured data of the surrounding rock deformation accords with the law of the surrounding rock deformation. The relation between excavation and surrounding rock deformation used in the simulation can guide construction. 4) through the curve fitting of the measured data of dome settlement and peripheral displacement. The analysis shows that the surrounding rock deformation of the soft rock tunnel in this section tends to be stable after closed by CRD method and new construction method, and can be used as secondary lining. 5) in view of the new construction method, it can be better and safer to carry out. Technical safety control measures and management safety control measures are adopted to solve the problems of large settlement of arch roof and stress concentration of structure in the new construction method. The excavation method is changed by adopting full section grouting. Vertical support method can effectively reduce the hidden dangers of construction safety.
【學(xué)位授予單位】：蘭州交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U455.4

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