【摘要】：本文以合�？瓦\(yùn)專線白樺隧道為工程背景,利用數(shù)值模擬的研究手段,對軟弱地層大斷面隧道超前預(yù)加固措施的加固效果進(jìn)行了全面系統(tǒng)的研究。為大斷面隧道的全斷面施工安全控制提供理論指導(dǎo)。本文主要完成了以下研究工作： 1.針對軟弱圍巖的特點(diǎn),闡述了超前預(yù)加固措施的適用條件和目標(biāo),為下文系統(tǒng)地研究不同超前預(yù)加固措施力學(xué)效應(yīng)及加固效果奠定基礎(chǔ)。 2.對不同超前預(yù)加固措施的加固機(jī)理進(jìn)行深入研究,進(jìn)而提出適合不同加固措施的數(shù)值模擬方法,為下文加固效果分析提供理論基礎(chǔ)。 3.結(jié)合工程實(shí)際情況,選取常見超前預(yù)加固措施進(jìn)行加固效果分析,分別研究不同加固措施支護(hù)參數(shù)變化對加固效果的影響,選取隧道開挖后掌子面臨空階段最大拱頂沉降、掌子面最大水平位移、支護(hù)參數(shù)變化引起的隧道變形等指標(biāo)對加固效果進(jìn)行評價(jià)。 4.根據(jù)新意法的理念,研究三種不同新型超前支護(hù)組合方式,分別為超前小導(dǎo)管+掌子面錨桿、超前管棚+掌子面錨桿、水平旋噴樁+掌子面錨桿。研究關(guān)鍵支護(hù)參數(shù)變化對組合加固措施加固效果的影響,并與單獨(dú)加固的加固效果進(jìn)行對比,探討組合加固措施的優(yōu)勢。 5.針對實(shí)際工況,通過對實(shí)測數(shù)據(jù)和數(shù)值模擬結(jié)果的分析,探討在采用組合加固措施的情況下,白樺隧道采用全斷面法施工的可能性。 本文研究成果對軟弱圍巖等不良地質(zhì)條件下隧道安全快速施工的理論研究和工程實(shí)踐具有一定指導(dǎo)意義。研究表明,在已有超前預(yù)加固措施的基礎(chǔ)之上,為實(shí)現(xiàn)隧道安全快速施工,可以通過對掌子面前方核心土預(yù)加固以及核心土外預(yù)支護(hù)相結(jié)合的方式,大幅提高核心土的強(qiáng)度,同時(shí)改善其受力情況,顯著減少掌子面的變形和隧道拱頂沉降,提高施工過程中掌子面的穩(wěn)定性。
[Abstract]:Taking Bai Hua Tunnel of Hefu passenger dedicated Line as the engineering background and by means of numerical simulation, this paper makes a comprehensive and systematic study on the reinforcement effect of advance pre-reinforcement measures for large-section tunnels in weak strata. It provides theoretical guidance for the safety control of the whole section construction of the large section tunnel. The main work of this paper is as follows: 1. In view of the characteristics of weak surrounding rock, the suitable conditions and objectives of advance pre-reinforcement measures are expounded, which lays a foundation for the systematic study of mechanical effects and reinforcement effects of different pre-reinforcement measures below. 2. In this paper, the reinforcement mechanism of different pre-reinforcement measures is deeply studied, and the numerical simulation method suitable for different reinforcement measures is put forward, which provides a theoretical basis for the analysis of reinforcement effect below. 3. Combined with the actual situation of the project, the common pre-reinforcement measures are selected to analyze the reinforcement effect, and the influence of the different reinforcement measures on the reinforcement effect is studied, and the maximum arch settlement is selected after the tunnel excavation. The maximum horizontal displacement of the face and the tunnel deformation caused by the change of supporting parameters are evaluated. 4. According to the idea of Xinyi method, three kinds of new advanced support combination methods are studied. They are the small lead pipe face anchor, the leading pipe shed palm anchor, and the horizontal rotary shotcrete pile palm bolt. The influence of key support parameters on the reinforcement effect of combined reinforcement measures is studied, and the advantages of combined reinforcement measures are discussed compared with those of individual reinforcement measures. 5. Based on the analysis of measured data and numerical simulation results, the possibility of using full section method to construct Bai Hua tunnel under combined reinforcement measures is discussed in the light of actual working conditions. The research results of this paper have certain guiding significance for the theoretical research and engineering practice of tunnel safety and rapid construction under the bad geological conditions such as soft surrounding rock. The research shows that, on the basis of the existing pre-reinforcement measures, in order to realize the safe and rapid construction of the tunnel, the strength of the core soil can be greatly improved by combining the core soil pre-reinforcement in front of the face with the core soil pre-support outside the core soil. At the same time, the deformation of the face and the settlement of the tunnel arch are greatly reduced, and the stability of the face is improved.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U455.4

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