【摘要】：隨著大量地下工程的興建,立交隧道工程也大量涌現(xiàn),其中下穿工程對既有隧道的安全形成了嚴(yán)峻的考驗(yàn),成為城市隧道建設(shè)中等級最高的風(fēng)險工程�，F(xiàn)有的研究主要是針對具體工程項(xiàng)目進(jìn)行研究,針對立交隧道的系統(tǒng)性研究非常缺乏,因此,針對主要環(huán)境敏感點(diǎn)建設(shè)立交隧道時“地層敏感性”及結(jié)構(gòu)適應(yīng)性問題進(jìn)行系統(tǒng)研究就非常有必要,對完善與促進(jìn)地下道路建設(shè)技術(shù)的發(fā)展具有重大意義。本文以重慶市科技人才培養(yǎng)計(jì)劃(領(lǐng)軍人才)項(xiàng)目“城市地下道路地層敏感度及結(jié)構(gòu)適應(yīng)性研究”為依托,利用數(shù)學(xué)系統(tǒng)分析理論中的敏感度分析方法結(jié)合彈塑性力學(xué)理論、有限元理論推導(dǎo)得出了立交隧道單因素敏感度公式,結(jié)合有限元數(shù)值模擬計(jì)算、數(shù)據(jù)調(diào)研手段,對不同埋深、不同圍巖條件、不同層厚工況下的立交隧道工程進(jìn)行了系統(tǒng)性的力學(xué)研究并得出了相應(yīng)的工程敏感度及適應(yīng)性措施。本文的主要研究內(nèi)容如下:①針對國內(nèi)十一省市上百座隧道進(jìn)行了詳細(xì)調(diào)查研究。②利用數(shù)學(xué)系統(tǒng)分析理論中的敏感度分析方法結(jié)合彈塑性力學(xué)理論、有限元理論推導(dǎo)得出了立交隧道單因素敏感度公式。③根據(jù)調(diào)研結(jié)果,建立了不同埋深、不同圍巖條件、不同層厚條件下的立交隧道三維有限元模型共計(jì)120組,對立交隧道新建隧道下穿既有隧道進(jìn)行了力學(xué)及敏感度研究。④以有限元模型計(jì)算結(jié)果為基礎(chǔ),并參考日本鐵路隧道近接施工指南以及《鐵路隧道施工規(guī)范》(TB10304-2009),從結(jié)構(gòu)物穩(wěn)定出發(fā),以新建隧道對既有隧道的影響應(yīng)力增加的容許值為基準(zhǔn),系統(tǒng)得出了立交隧道不同埋深、不同圍巖條件下新建隧道與既有隧道的合理層厚,為以后立交隧道新建隧道下穿既有隧道的設(shè)計(jì)以及施工提供參考;將前文計(jì)算所得的敏感度劃分為強(qiáng)敏感區(qū)、弱敏感區(qū)、非敏感區(qū),避免在以后立交隧道設(shè)計(jì)過程中,使新建隧道對既有隧道的影響處在強(qiáng)敏感區(qū)。⑤在前文所得敏感區(qū)敏感度閾值的基礎(chǔ)之上,根據(jù)調(diào)研結(jié)果制定相應(yīng)的結(jié)構(gòu)適應(yīng)性計(jì)算模型,得出了相應(yīng)適應(yīng)性模型的敏感度。⑥根據(jù)適應(yīng)性方案實(shí)際降低敏感度的效果,將適應(yīng)性方案按照強(qiáng)敏感區(qū)、弱敏感區(qū)分類,為立交隧道新建隧道下穿既有隧道處于特殊敏感區(qū)內(nèi)的工況適應(yīng)性方案的選擇提供參考,避免主觀錯誤判斷。
[Abstract]:With the construction of a large number of underground projects, the overpass tunnel project has emerged in large numbers, among which the underpass project has formed a severe test to the safety of the existing tunnel, and has become the highest grade risk engineering in the construction of urban tunnel. The existing research is mainly aimed at specific engineering projects, and the systematic research on the interchange tunnel is very lacking, so, It is necessary to systematically study the problems of "stratum sensitivity" and structural adaptability in the construction of interchange tunnels at major environmental sensitive points, which is of great significance to improve and promote the development of underground road construction technology. In this paper, based on Chongqing Science and Technology Talent training Program (leading talent) project, "study on the sensitivity and structural adaptability of Urban Underground Road", the sensitivity analysis method of mathematical system analysis theory is combined with elastic-plastic mechanics theory. The formula of single factor sensitivity of the interchange tunnel is derived from the finite element theory. Combined with the finite element numerical simulation calculation and the data investigation method, different buried depth and different surrounding rock conditions are obtained. A systematic mechanical study was carried out on the interchange tunnel under different layer thickness conditions, and the corresponding engineering sensitivity and adaptive measures were obtained. The main contents of this paper are as follows: 1. A detailed investigation was carried out on more than 100 tunnels in 11 provinces and cities in China .2 using sensitivity analysis method in mathematical system analysis theory combined with elastoplastic mechanics theory. Based on the results of investigation, a three-dimensional finite element model of an interchange tunnel with different burial depth, different surrounding rock condition and different layer thickness was established, and a total of 120 groups of 3D finite element models were established. Based on the results of finite element model, the mechanics and sensitivity of the existing tunnel under the new tunnel are studied. With reference to the Japanese Railway Tunnel Construction Guide and the Railway Tunnel Construction Code (TB10304-2009), based on the stability of the structure and the allowable value of the stress increase of the new tunnel on the existing tunnel, the different buried depths of the interchange tunnel are obtained systematically. The reasonable layer thickness of the new tunnel and the existing tunnel under different surrounding rock conditions provides a reference for the design and construction of the new tunnel under the existing tunnel in the future interchange tunnel, the sensitivity calculated above is divided into strong sensitive area and weak sensitive zone, In order to avoid the influence of the new tunnel on the existing tunnel in the design process of the overpass tunnel in the future, the insensitive zone should be located on the basis of the sensitivity threshold of the sensitive zone obtained in the previous paper. According to the investigation results, the corresponding structural adaptability calculation model is established, and the sensitivity of the corresponding adaptive model is obtained. The sensitivity of the corresponding adaptive model is reduced according to the actual adaptability scheme, and the adaptive scheme is classified according to the strong sensitive region and the weak sensitive area. This paper provides a reference for the selection of adaptive scheme of operating condition in the special sensitive zone of the existing tunnel under the new tunnel, and avoids the subjective misjudgment.
【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】：2015
【分類號】：U451

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本文編號：2193218