發(fā)布時(shí)間：2018-06-04 23:48

  本文選題：有限元強(qiáng)度折減法 + 力學(xué)參數(shù)反演��； 參考：《山東科技大學(xué)》2017年碩士論文

【摘要】：隨著城市現(xiàn)代化步伐的加快,交通擁堵問題逐漸受到人們關(guān)注。青島這座城市也不例外,道路窄、車輛多是青島交通現(xiàn)在面臨的主要問題,因此地下交通的開發(fā)被提上日程。城市地下軌道交通的建設(shè),能夠在很大程度上緩解地面擁堵問題,而且能夠減少當(dāng)前城市普遍面臨的噪聲污染、城市美觀等問題。大量地鐵隧道的建設(shè),對(duì)其安全穩(wěn)定性及圍巖性質(zhì)分析預(yù)測(cè)能力提出了更高要求。本文基于有限元強(qiáng)度折減法以及反演圍巖力學(xué)參數(shù),分析預(yù)測(cè)了城市地鐵隧道圍巖穩(wěn)定性,研究如下:(1)本文首先對(duì)比分析了有限元強(qiáng)度折減法的計(jì)算優(yōu)勢(shì),并采用有限元強(qiáng)度折減法研究了青島上覆分層巖土淺埋地鐵隧道圍巖穩(wěn)定性。分析了淺埋雙線隧道圍巖失穩(wěn)破壞機(jī)理,運(yùn)用有限元軟件ANSYS,建立了三維數(shù)值模型,模擬計(jì)算了圍巖的塑性區(qū)發(fā)展以及破壞面位置。研究表明,淺埋雙線隧道破壞首先從兩隧道中間巖體拱腳處開始,而拱頂應(yīng)力較小,破壞時(shí)中間巖體塑性區(qū)貫通,將塑性應(yīng)變最大點(diǎn)連接即為圍巖破壞面。(2)文中考慮多種因素分析驗(yàn)證了穩(wěn)定性結(jié)論的可靠性。分別考慮了不同隧道埋深、不同雙線隧道間距對(duì)隧道穩(wěn)定性影響;分析了隧道在不同埋深、所處不同圍巖類別條件下圍巖安全系數(shù)變化規(guī)律。研究了隧道穩(wěn)定性對(duì)圍巖各個(gè)力學(xué)參數(shù)的敏感度,得到了一系列結(jié)論。(3)提出了將最小安全系數(shù)法及相對(duì)位移法結(jié)合反演計(jì)算圍巖力學(xué)參數(shù)的改進(jìn)方法,驗(yàn)證了改進(jìn)后的方法在反演力學(xué)參數(shù)方面的可行性。并以青島地鐵隧道工程為背景,采用新方法反演了青島地鐵隧道圍巖力學(xué)參數(shù),并驗(yàn)證了計(jì)算參數(shù)精確性。論文最后基于改進(jìn)后的反演方法計(jì)算得到的圍巖力學(xué)參數(shù),結(jié)合有限元數(shù)值模擬計(jì)算,分析預(yù)測(cè)了青島地區(qū)擬開挖隧道圍巖穩(wěn)定性,預(yù)測(cè)結(jié)論為地鐵隧道的安全施工提供了依據(jù)。
[Abstract]:With the acceleration of the pace of urban modernization, traffic congestion has gradually attracted people's attention. Qingdao this city is no exception, the road is narrow, the vehicle is the main problem that Qingdao traffic faces now, so the development of underground traffic is put on the agenda. The construction of urban underground rail transit can alleviate the problem of ground congestion to a great extent and reduce the problems of noise pollution and urban aesthetics. With the construction of a large number of subway tunnels, higher requirements are put forward for their safety and stability and the ability to analyze and predict the surrounding rock properties. Based on the finite element strength reduction method and the inversion of the mechanical parameters of surrounding rock, the stability of surrounding rock of urban subway tunnel is analyzed and forecasted in this paper. The stability of surrounding rock of Qingdao overlying stratified rock and soil shallow buried subway tunnel is studied by using finite element strength reduction method. In this paper, the failure mechanism of surrounding rock in shallow double-line tunnel is analyzed, and a three-dimensional numerical model is established by using finite element software ANSYS.The development of plastic zone and the location of failure surface of surrounding rock are simulated and calculated. The results show that the failure of shallow double track tunnel begins at the arch of the middle rock mass of the two tunnels, and the stress of the arch top is small, so the plastic zone of the intermediate rock mass is broken through. In this paper, the reliability of the stability conclusion is verified by considering a variety of factors. The influence of different tunnel depth and double tunnel spacing on tunnel stability is considered, and the variation law of surrounding rock safety factor is analyzed under different buried depth and different surrounding rock types. In this paper, the sensitivity of tunnel stability to the mechanical parameters of surrounding rock is studied, and a series of conclusions are obtained. An improved method is proposed to inverse calculate the mechanical parameters of surrounding rock by combining the minimum safety factor method with the relative displacement method. The feasibility of the improved method in inversion of mechanical parameters is verified. Taking Qingdao subway tunnel project as the background, the mechanical parameters of surrounding rock of Qingdao subway tunnel are inversed by a new method, and the accuracy of calculation parameters is verified. Finally, based on the mechanical parameters of surrounding rock calculated by improved inversion method, combined with finite element numerical simulation, the stability of surrounding rock of excavated tunnel in Qingdao area is analyzed and forecasted. The prediction results provide the basis for the safe construction of subway tunnel.
【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
【分類號(hào)】：U451.2

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本文編號(hào)：1979401