本文選題：深埋隧道 + 解析法��； 參考：《山東科技大學(xué)》2017年碩士論文

【摘要】：鐵路隧道開(kāi)挖深度的不斷增加、地壓大、地質(zhì)條件復(fù)雜、缺乏正確的理論指導(dǎo)、設(shè)計(jì)與施工工藝存在較大的盲目性,造成隧道襯砌坍塌現(xiàn)象常常發(fā)生,已成為隧道建設(shè)中亟待解決的重大技術(shù)難題。國(guó)內(nèi)外對(duì)隧道襯砌坍塌破壞的研究多集中在支護(hù)結(jié)構(gòu)受力機(jī)理、穩(wěn)定性問(wèn)題以及支護(hù)結(jié)構(gòu)破壞后的重新修復(fù)方面,針對(duì)隧道二次襯砌受力機(jī)理及穩(wěn)定性的研究成果存在較大的局限性,并且基于解析法的二次襯砌支護(hù)最佳時(shí)機(jī)問(wèn)題則少有研究。針對(duì)城際鐵路隧道二次襯砌的合理支護(hù)時(shí)機(jī)進(jìn)行分析,以青島“藍(lán)色硅谷”城際鐵路嶗山隧道工程為依托,通過(guò)現(xiàn)場(chǎng)監(jiān)控量測(cè)數(shù)據(jù),以及大型有限差分軟件FLAC3D對(duì)隧道開(kāi)挖支護(hù)進(jìn)行模擬分析,并最終將現(xiàn)場(chǎng)實(shí)測(cè)結(jié)果以及模擬分析結(jié)果相結(jié)合,具體分析隧道二次襯砌的合理支護(hù)時(shí)機(jī)。本文對(duì)城際鐵路隧道二次襯砌的施作時(shí)機(jī)主要進(jìn)行了以下研究:(1)通過(guò)理論分析,詳細(xì)分析深埋隧道二次襯砌受荷類(lèi)型,分析在不同荷載作用下,二襯結(jié)構(gòu)的受荷特征;分析二襯結(jié)構(gòu)在荷載作用下的破壞特征,特別是二襯裂縫的演化過(guò)程及分布規(guī)律,根據(jù)不同類(lèi)型、不同部位的裂縫演化特征,分別從設(shè)計(jì)、施工、材料等方面影響隧道深埋隧道變形及破壞的影響因素。(2)分析了對(duì)襯砌施工產(chǎn)生作用的因素,詳細(xì)介紹了確定二次襯砌支護(hù)時(shí)機(jī)的機(jī)理和方法步驟,并從支護(hù)抗力、變形速率、位移變化三個(gè)方面分析了襯砌合理支護(hù)時(shí)機(jī)的原理;考慮各種因素的影響,建立符合工程實(shí)際情況最佳支護(hù)時(shí)機(jī)的解析公式,在圍巖參數(shù)已知的情況下,可以計(jì)算出隧道洞壁周邊變形量,并與實(shí)際工程中的監(jiān)測(cè)到的圍巖變形量數(shù)據(jù)進(jìn)行對(duì)比分析,確定了二次襯砌支護(hù)的時(shí)機(jī),從理論上解決了深埋隧道二次襯砌的支護(hù)時(shí)機(jī)問(wèn)題。(3)通過(guò)有限元FLAC3D分析軟件,模擬了嶗山隧道的支護(hù),在模擬過(guò)程中,分析了在不同應(yīng)力釋放率下隧道襯砌的受力情況及隧道圍巖的變形情況,得到了嶗山隧道二次襯砌的最佳支護(hù)時(shí)機(jī),利用監(jiān)控量測(cè)技術(shù),研究了隧道開(kāi)挖過(guò)程中,隧道周邊收斂和拱頂沉降,并與FLAC3D數(shù)據(jù)進(jìn)行比較,推算出了二次襯砌的合理施作時(shí)機(jī),驗(yàn)證了解析公式的正確性。
[Abstract]:The excavation depth of railway tunnel is increasing continuously, the ground pressure is high, the geological condition is complex, and lack of correct theoretical guidance, the design and construction technology is more blind, and the phenomenon of tunnel lining collapse often occurs. It has become an important technical problem to be solved in tunnel construction. The research of tunnel lining collapse damage at home and abroad is mainly focused on the mechanical mechanism, stability of the support structure and the re-repair after the failure of the support structure. The research results on the mechanism and stability of secondary lining of tunnel are limited, and the optimal time of secondary lining support based on analytic method is seldom studied. Based on the analysis of the reasonable supporting time of the secondary lining of the inter-city railway tunnel, based on the Laoshan tunnel project of Qingdao "Blue Silicon Valley" inter-city railway, the field monitoring and measuring data are adopted. And the large-scale finite-difference software FLAC3D is used to simulate and analyze the tunnel excavation support. Finally, combining the field measured results with the simulation analysis results, the reasonable supporting time of the secondary lining of the tunnel is analyzed. In this paper, the following research on the timing of secondary lining of inter-city railway tunnel is carried out: (1) through theoretical analysis, the types of secondary lining of deep buried tunnel are analyzed in detail, and the loading characteristics of secondary lining structure under different loads are analyzed. The failure characteristics of two-liner structure under load, especially the evolution process and distribution law of two-liner cracks are analyzed. According to the evolution characteristics of cracks in different types and different parts, the design and construction are carried out respectively. The factors influencing the deformation and failure of deep buried tunnel are analyzed, the mechanism and method of determining the time of secondary lining support are introduced in detail, and the resistance and deformation rate of secondary lining are introduced in detail. This paper analyzes the principle of reasonable supporting time of lining in three aspects of displacement variation, establishes the analytical formula of optimum supporting time according to the actual situation of engineering, considering the influence of various factors, and when the surrounding rock parameters are known, The surrounding deformation of tunnel wall can be calculated and compared with the deformation data of surrounding rock monitored in actual engineering, and the time of secondary lining support is determined. The problem of supporting opportunity of secondary lining of deep buried tunnel is solved theoretically. The support of Laoshan tunnel is simulated by finite element software FLAC3D. In the process of simulation, The stress situation of tunnel lining and the deformation of tunnel surrounding rock under different stress release rates are analyzed. The optimum supporting time for the secondary lining of Laoshan tunnel is obtained. The monitoring and measurement technology is used to study the excavation process of the tunnel. Compared with the FLAC3D data, the reasonable timing of the secondary lining is calculated, and the correctness of the analytical formula is verified.
【學(xué)位授予單位】：山東科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：U455.91

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