本文選題：隧洞　切入點(diǎn)：破壞機(jī)理　出處：《重慶交通大學(xué)》2014年碩士論文

【摘要】：鐵路、公路、城市地鐵及城市建設(shè)等領(lǐng)域修建了大量的隧洞與地下工程，在這種情況下對(duì)于隧洞與地下工程的穩(wěn)定性研究就顯得更為重要。當(dāng)前人們對(duì)隧洞失穩(wěn)破壞判據(jù)的研究尚不成熟，依據(jù)不同的失穩(wěn)判據(jù)一般會(huì)得出不相同的穩(wěn)定安全度，如何建立一個(gè)既具有理論基礎(chǔ)又與工程實(shí)際相符，既能夠反映隧洞的破壞本質(zhì)，又不受其他因素干擾的穩(wěn)定性定量判據(jù)是十分必要的。而對(duì)隧洞的破壞機(jī)理開展研究是提出一種科學(xué)合理的失穩(wěn)破壞判據(jù)的首要前提。故本文主要采用了有限元強(qiáng)度折減法對(duì)不同埋深隧洞的穩(wěn)定性問題進(jìn)行研究，并對(duì)其破壞機(jī)理進(jìn)行探討。 ①總結(jié)了當(dāng)前國內(nèi)外地下工程圍巖穩(wěn)定性的研究現(xiàn)狀，，并分析了隧洞圍巖的破壞機(jī)理，推導(dǎo)了圓形隧洞圍巖的塑性滑移線方程；對(duì)圍巖壓力理論和壓力的解析計(jì)算和數(shù)值計(jì)算進(jìn)行了概要性介紹。 ②對(duì)有限元極限分析法的原理和基本理論進(jìn)行了總結(jié)，選取了適合于有限元強(qiáng)度折減法的本構(gòu)模型、屈服準(zhǔn)則及流動(dòng)法則，簡要介紹了有限元非線性分析的三種基本方法，并對(duì)DP4屈服準(zhǔn)則與DP1屈服準(zhǔn)則下安全系數(shù)的轉(zhuǎn)換公式進(jìn)行了推導(dǎo)，介紹了一種在ANSYS中實(shí)現(xiàn)DP4屈服準(zhǔn)則的方法。 ③介紹了幾種主要的隧洞圍巖穩(wěn)定性判據(jù)，包括圍巖的極限位移和極限應(yīng)變判據(jù)、圍巖塑性區(qū)大小判據(jù)，分析這些判據(jù)的缺陷并介紹了更為合理的圍巖安全系數(shù)判據(jù)。 ④分別建立同面積的圓形、馬蹄形、矩形斷面隧洞模型，并分析它們?cè)谙嗤瑖鷰r條件下的圍巖安全系數(shù)各自隨不同埋深的變化規(guī)律，分析表明圓形、馬蹄形這類拱形隧洞與同樣埋深條件下的矩形隧洞相比具有更高的安全系數(shù)。 ⑤從分析結(jié)果可以看出隧洞在淺埋時(shí)表現(xiàn)出比深埋時(shí)更大的安全系數(shù)，這可能與工程實(shí)際不相符。分析了產(chǎn)生這個(gè)問題的原因，并給出了解決該問題的建議。 ⑥以重慶市軌道交通所經(jīng)隧道—中梁山隧道為依托，對(duì)圍巖安全系數(shù)采用有限元強(qiáng)度折減法計(jì)算，而襯砌安全系數(shù)按結(jié)構(gòu)力學(xué)方法進(jìn)行計(jì)算。分別研究分析了圍巖、變電所初襯及正洞隧道二襯的安全系數(shù)的變化規(guī)律。
[Abstract]:A large number of tunnels and underground projects have been built in the fields of railway, highway, urban subway and urban construction. In this case, it is more important to study the stability of tunnels and underground projects.At present, the research of tunnel instability failure criterion is not mature. According to different instability criterion, different stability and safety degree can be obtained. How to establish a tunnel failure criterion is not only theoretical foundation but also accord with engineering practice.It is necessary that the quantitative criterion of stability can reflect the nature of tunnel failure and not be disturbed by other factors.The research on the failure mechanism of tunnel is the first prerequisite to propose a scientific and reasonable criterion of instability failure.In this paper, the finite element strength reduction method is used to study the stability of tunnels with different buried depths, and the failure mechanism is discussed.The main contents are as follows: (1) the present research status of surrounding rock stability of underground engineering at home and abroad is summarized, and the failure mechanism of surrounding rock of tunnel is analyzed, and the plastic slip line equation of surrounding rock of circular tunnel is deduced.The theory of surrounding rock pressure and the analytical and numerical calculation of surrounding rock pressure are briefly introduced in this paper.Secondly, the principle and basic theory of finite element limit analysis are summarized. The constitutive model, yield criterion and flow rule suitable for finite element strength reduction method are selected, and three basic methods of nonlinear finite element analysis are introduced briefly.The conversion formula of safety factor under DP4 yield criterion and DP1 yield criterion is deduced, and a method to realize DP4 yield criterion in ANSYS is introduced.3. Several main criteria for the stability of surrounding rock in tunnel are introduced, including the criterion of limit displacement and limit strain of surrounding rock, the criterion of plastic zone of surrounding rock, the defect of these criteria and the more reasonable criterion of safety factor of surrounding rock.(4) the tunnel models of circular, horseshoe and rectangular sections with the same area are established, and the variation law of the safety factor of surrounding rock with different burial depth under the same surrounding rock condition is analyzed.Compared with the rectangular tunnel with the same buried depth, the horseshoe arch tunnel has a higher safety factor.(5) from the analysis results, it can be seen that the tunnel shows a greater safety factor in shallow burying than in deep burying, which may not be in accord with the engineering practice.The causes of this problem are analyzed, and some suggestions to solve the problem are given.The safety factor of surrounding rock is calculated by finite element strength reduction method, and the safety factor of lining is calculated according to the structural mechanics method based on the tunnel of Chongqing Railway Transportation Institute-Zhongliangshan Tunnel.The variation law of safety factor of surrounding rock, primary lining of substation and second lining of Zhengdong tunnel is studied and analyzed respectively.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U451.2

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