本文選題：城市雙連拱隧道 + 松動圍巖荷載�。� 參考：《中國鐵道科學(xué)研究院》2014年碩士論文

【摘要】：修建城市隧道,合理利用地下空間,是解決越來越嚴重的城市交通擁擠、行車緩慢等問題的重要方法。城市隧道由于其所處的特殊位置,經(jīng)常會受到規(guī)劃用地、已有建筑等因素的影響,導(dǎo)致其線路難以展開,在這種情況下雙連拱隧道是一種十分理想的解決方案。雙連拱隧道具有方便洞口洞身的選擇、避免橋隧線分幅、使線路流暢、節(jié)約城市用地等優(yōu)點。但是雙連拱隧道往往跨度大、埋深淺、工序繁多、受力復(fù)雜,在施工和設(shè)計上還有許多未解決的問題。研究如何在城市中安全、經(jīng)濟、合理地修建雙連拱隧道是十分必要的。 本文以某城市淺埋山嶺雙連拱隧道為背景,借鑒了國內(nèi)外學(xué)者的相關(guān)研究成果,從施工方法、設(shè)計理論、數(shù)值模擬、現(xiàn)場量測等方面對城市雙連拱隧道施工和設(shè)計中的一些關(guān)鍵問題進行了研究,主要得到如下結(jié)論： (1)城市雙連拱隧道往往埋深淺、跨度大、水位高、結(jié)構(gòu)受力復(fù)雜、施工難度大,綜合考慮地質(zhì)條件、周圍環(huán)境、施工技術(shù)、工期、經(jīng)濟投入等因素正確選擇施工方法及配套輔助施工措施至關(guān)重要。 (2)采用荷載—結(jié)構(gòu)模型計算雙連拱隧道松動荷載時,其塌落拱高度介于結(jié)構(gòu)全跨度和半跨度之間,塌落拱高度可采用普氏理論計算,附加荷載在全跨度上分布。 (3)淺埋情況下采用三導(dǎo)洞法施工比中導(dǎo)洞法更有利于控制沉降,也更有利于中隔墻的受力情況,左右洞室先開挖的一側(cè)會受到更大的影響。 (4)在雙連拱隧道開挖過程中,中隔墻會受到各個方向上的偏壓彎曲作用,對中隔墻兩側(cè)進行回填處理能夠顯著降低中隔墻的最大受力和偏壓程度,但是由于回填土的自重會對土體沉降產(chǎn)生一定影響。 (5)各導(dǎo)洞開挖會對周圍已挖導(dǎo)洞的拱頂沉降、洞周收斂以及上方地表沉降造成影響。 (6)本次數(shù)值模擬得到的結(jié)果對比現(xiàn)場實測值低,但是仍然可以定性地反映雙連拱隧道開挖過程中的各種力學(xué)效應(yīng),是研究雙連拱隧道施工力學(xué)效應(yīng)的有力工具。 (7)在施工過程中引入信息化設(shè)計施工可以隨時了解圍巖與支護受力狀態(tài),驗證并調(diào)整支護參數(shù),發(fā)生異常時立即采取應(yīng)對措施,控制施工對周邊環(huán)境影響,確保工程的安全性、可靠性和經(jīng)濟性。
[Abstract]:It is an important method to build urban tunnels and make rational use of underground space to solve the problems of more and more serious urban traffic congestion and slow driving.Due to its special position, urban tunnel is often affected by planning land, existing buildings and other factors, which leads to its line difficult to expand. In this case, double-arch tunnel is a very ideal solution.The double-arch tunnel has the advantages of convenient choice of hole body, avoiding the separation of bridge and tunnel line, making the line smooth, saving urban land and so on.However, double arch tunnels often have large span, shallow buried depth, various working procedures and complicated forces, so there are still many unsolved problems in construction and design.It is necessary to study how to build double arch tunnel safely, economically and reasonably in the city.In this paper, based on the shallow buried mountain double-arch tunnel in a certain city, and referring to the related research results of domestic and foreign scholars, from the construction method, design theory, numerical simulation,Some key problems in the construction and design of urban double-arch tunnel are studied in the field measurement and other aspects. The main conclusions are as follows:Urban double-arch tunnels are often buried in shallow depth, with large span, high water level, complicated structure, difficult construction, comprehensive consideration of geological conditions, surrounding environment, construction technology, construction period,It is very important to select construction methods and auxiliary construction measures correctly for economic input.2) when the load-structure model is used to calculate the loose load of double-arch tunnel, the height of collapse arch is between the whole span and half span of the structure. The height of collapsing arch can be calculated by using Plancey theory, and the additional load is distributed on the whole span.3) under shallow burying condition, it is more favorable to control settlement and force condition of middle partition wall by using three guide tunnel method than middle guide tunnel method, and the side of left and right cavern excavation will be more affected.4) in the course of double arch tunnel excavation, the middle partition wall will be subjected to the deflection bending action in all directions, and the backfill treatment on both sides of the middle partition wall can significantly reduce the maximum force and the degree of bias of the middle partition wall.However, the self-weight of backfill will have a certain effect on soil settlement.5) the excavation of each guide tunnel will have an effect on the settlement of the arch top, the convergence around the hole and the surface subsidence above the tunnel.6) the results obtained by this numerical simulation are lower than the field measured values, but they can still reflect qualitatively all kinds of mechanical effects in the excavation process of double-arch tunnels, which is a powerful tool for studying the construction mechanical effects of double-arch tunnels.Introduction of information design and construction in the construction process can know the state of surrounding rock and support force at any time, verify and adjust the supporting parameters, take immediate measures to control the impact of construction on the surrounding environment, and ensure the safety of the project.Reliability and economy.
【學(xué)位授予單位】：中國鐵道科學(xué)研究院
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U455.4

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