本文選題：小凈距隧道 + 淺埋　； 參考：《重慶交通大學(xué)》2014年碩士論文

【摘要】：本文主要分析了城市小凈距隧道開挖方法的力學(xué)行為研究,依托工程為五里坪隧道由小凈距過渡到分離式淺埋段,本文分析主要包括六大部分：第一,主要分析了小凈距隧道導(dǎo)洞之間的相互影響、小凈距隧道的設(shè)計(jì)和施工、中加巖柱的穩(wěn)定性和加固措施和小凈距隧道監(jiān)控量測的國內(nèi)外研究現(xiàn)狀,并且闡述了本文的研究的主要思路和方式方法；第二,重點(diǎn)闡述了隧道力學(xué)的基本理論和圍巖基本理論、有限元的基本理論；第三,主要描述了五里坪小凈距隧道的設(shè)計(jì)過程；第四,主要針對具體的依托工程采用五種開挖方法建立模型,重點(diǎn)分析了五種工法的位移、應(yīng)力、應(yīng)變等基本參數(shù)；第五,主要論述了小凈距隧道監(jiān)控量測在新奧法中的地位以及主要的監(jiān)控量測項(xiàng)目；第六,主要針對本文的綜合分析得出主要的結(jié)論以及對小凈距隧道的研究展望。本文的結(jié)論性研究主要包括以下三個(gè)方面： ①結(jié)合工程設(shè)計(jì)實(shí)際參數(shù),利用MIDAS/GTS建模進(jìn)行三維有限元數(shù)值模擬,討論小凈距隧道的基本力學(xué)特性：圍巖塑性區(qū)、洞周位移、圍巖應(yīng)力、以及地表沉降分析； ②通過對五里坪小凈距隧道淺埋段采用全斷面法、臺階法、CRD法、雙側(cè)壁導(dǎo)坑法等四種工法下的圍巖應(yīng)力、應(yīng)變、位移以及中加巖處的應(yīng)力應(yīng)變對比分析研究,最終針對特定的圍巖選取最優(yōu)的工法,確保小凈距隧道達(dá)到技術(shù)上可行、經(jīng)濟(jì)上合理、安全上有保證。 ③依托工程現(xiàn)場監(jiān)測信息,分析小凈距隧道監(jiān)控重點(diǎn)部位力學(xué)特性和對小凈距隧道重點(diǎn)部位圍巖-支護(hù)系統(tǒng)的穩(wěn)定性分析和判斷。
[Abstract]:This paper mainly analyzes the mechanical behavior of the excavation method of the small distance tunnel in the city. Relying on the project of Wuliping tunnel, the transition from the small net distance to the split shallow burying section is carried out. The analysis of this paper mainly includes six parts: first, This paper mainly analyzes the interaction between the guide tunnels of the small net distance tunnel, the design and construction of the small clear distance tunnel, the stability and reinforcement measures of the added rock column, and the domestic and international research status of the monitoring and measurement of the small net distance tunnel. The main ideas and methods of this paper are described. Secondly, the basic theory of tunnel mechanics, the basic theory of surrounding rock, the basic theory of finite element, the design process of Wuliping small distance tunnel are described. Fourth, the paper mainly uses five excavation methods to establish the model for the specific supporting project, focusing on the analysis of the displacement, stress, strain and other basic parameters of the five methods. This paper mainly discusses the position of monitoring measurement of small net distance tunnel in the new Austrian method and the main monitoring measurement items. Sixth, the main conclusions are obtained from the comprehensive analysis of this paper and the research prospect of small net distance tunnel is also discussed. The conclusion of this paper mainly includes the following three aspects: The main contents are as follows: 1. According to the actual engineering design parameters, the three-dimensional finite element numerical simulation is carried out by using MIDAS/GTS modeling, and the basic mechanical characteristics of the tunnel with small net distance are discussed: plastic zone of surrounding rock, displacement of surrounding rock, stress of surrounding rock, and analysis of ground subsidence; (2) the stress, strain, displacement of surrounding rock and the stress and strain of middle adding rock are compared and analyzed by using the full section method, step method CRD method and double side wall guide pit method in the shallow burying section of Wuliping small distance tunnel. Finally, the optimal construction method is selected for the specific surrounding rock to ensure the technical feasibility, economic reasonableness and safety of the small net distance tunnel. (3) based on the monitoring information of engineering site, the mechanical characteristics of monitoring key parts of small clear distance tunnel and the stability analysis and judgement of surrounding rock support system in the key part of small clear distance tunnel are analyzed.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U451;U455.4

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