本文選題：盾構(gòu)隧道 + 穿越施工　； 參考：《長安大學(xué)》2017年碩士論文

【摘要】：近年來我國掀起了城市地鐵盾構(gòu)隧道建設(shè)的熱潮,盾構(gòu)隧道近接施工越來越普遍。但是,新建盾構(gòu)隧道與既有連拱隧道近距離平行穿越的復(fù)雜形式尚不多見,施工時既有連拱隧道的結(jié)構(gòu)安全可能會受到影響,對于城市地鐵而言是一種挑戰(zhàn),需要合理處理。為此,本文以西安地鐵4號線航天新城~航天東路區(qū)間隧道工程實例為依托,分別從理論分析、數(shù)值模擬、現(xiàn)場實測方面分析盾構(gòu)隧道穿越既有連拱隧道的影響規(guī)律及穿越施工期間采取的施工工程措施。論文的主要研究工作如下:(1)根據(jù)彈性力學(xué)Mindlin解得到了盾構(gòu)施工正面推力和側(cè)壁摩擦力引起的土體變形及附加應(yīng)力計算公式,同時結(jié)合鏡像法基本原理對土體損失引起的附加應(yīng)力進(jìn)行了求解,得到三者共同作用下總的附加應(yīng)力計算公式。利用MATLAB對依托工程中連拱隧道軸線位置處土體位移及作用于連拱隧道上的附加荷載分布情況進(jìn)行了系統(tǒng)的分析計算。(2)建立新建盾構(gòu)隧道穿越既有連拱隧道的三維數(shù)值計算模型,利用空模型、改變單元材料參數(shù)和施加面力等方法實現(xiàn)土體開挖、支護(hù)壓力施加、注漿壓力施加、管片拼裝等動態(tài)施工過程的精細(xì)化模擬,分析盾構(gòu)隧道在施工過程中對連拱隧道支護(hù)結(jié)構(gòu)及周邊圍巖的影響規(guī)律。(3)以不同圍巖軟硬程度、隧道凈距、注漿壓力及土倉壓力這四個主要參數(shù)進(jìn)行了參數(shù)變化分析。(4)分析、總結(jié)了國內(nèi)外相關(guān)標(biāo)準(zhǔn)和和類似工程經(jīng)驗,初步制定了盾構(gòu)隧道穿越連拱隧道安全施工控制標(biāo)準(zhǔn),以確保既有連拱隧道結(jié)構(gòu)安全。詳細(xì)介紹了盾構(gòu)穿越施工時的參數(shù)計算及選取,通過與現(xiàn)場第350環(huán)~707環(huán)施工時土倉壓力、掘進(jìn)速度、同步注漿壓力、推力、出土量、刀盤扭矩及轉(zhuǎn)速的統(tǒng)計數(shù)據(jù)比較表明:計算所得參數(shù)與所采用的掘進(jìn)參數(shù)較為吻合。并對盾構(gòu)隧道近距離平行穿越連拱隧道施工時的土體加固措施、連拱隧道結(jié)構(gòu)加固措施進(jìn)行簡要介紹、分析,為類似穿越工程提供安全控制措施方面的建議。(5)對穿越施工現(xiàn)場監(jiān)測項目、斷面及測點布置、監(jiān)測元件及監(jiān)測結(jié)果等進(jìn)行簡要介紹。結(jié)合隧道施工對地表建筑(構(gòu))筑物的影響、日本隧道近接施工指南,根據(jù)盾構(gòu)隧道施工前后連拱隧道拱頂豎向位移、二次襯砌混凝土壓應(yīng)力變化提出了基于位移準(zhǔn)則及強度準(zhǔn)則的影響分區(qū)方法,針對盾構(gòu)施工對新建連拱隧道結(jié)構(gòu)影響可進(jìn)行有效分區(qū)�，F(xiàn)場施工過程中盾構(gòu)隧道最終安全通過穿越段,且既有連拱隧道的襯砌結(jié)構(gòu)未出現(xiàn)裂縫,表明現(xiàn)場采用的施工方案及措施是合理的,可以切實地解決施工所面臨的問題,對今后相似穿越形式的城市地鐵隧道建設(shè)具有一定的借鑒作用。
[Abstract]:In recent years, the urban subway shield tunnel construction upsurge in China, shield tunnel construction is becoming more and more common. However, the complex forms of parallel crossing between the newly built shield tunnel and the existing multi-arch tunnel are rare, and the structural safety of the existing double-arch tunnel may be affected during the construction, which is a challenge to the urban subway and needs to be dealt with reasonably. For this reason, based on the practical example of the tunnel project between the space new city and the east space road of Xi'an Metro Line 4, this paper analyzes and simulates the tunnel from the theory and the numerical simulation, respectively. The influence of shield tunneling through the existing multi-arch tunnel and the construction measures taken during the construction are analyzed. The main research work of this paper is as follows: (1) according to the Mindlin solution of elastic mechanics, the formulas of soil deformation and additional stress caused by the front thrust and friction force on the side wall of shield tunneling are obtained. At the same time, combined with the basic principle of mirror image method, the additional stress caused by soil loss is solved, and the calculation formula of total additional stress under the joint action of the three methods is obtained. In this paper, the displacement of soil at the axis of multi-arch tunnel and the distribution of additional load acting on multi-arch tunnel are systematically analyzed and calculated by using MATLAB). The three-dimensional numerical calculation model of newly built shield tunnel passing through the existing multi-arch tunnel is established. The dynamic construction process such as soil excavation, support pressure, grouting pressure, segment assembly and so on are simulated by means of void model, changing the material parameters of the unit and applying the surface force, etc. This paper analyzes the influence law of shield tunnel on the supporting structure of multi-arch tunnel and surrounding surrounding rock during the construction process. It analyzes the four main parameters, including soft and hard degree of surrounding rock, net distance of tunnel, grouting pressure and pressure of soil storehouse. This paper summarizes the relevant standards and similar engineering experiences at home and abroad and preliminarily formulates the safety construction control standard of shield tunneling through multi-arch tunnel in order to ensure the structural safety of existing multi-arch tunnel. The calculation and selection of parameters during shield tunneling construction are introduced in detail. The earth chamber pressure, tunneling speed, synchronous grouting pressure, thrust force, unearthed amount are obtained through the construction of No. 350 ring and 707 ring on the spot. The comparison of the torque and rotational speed of the cutter head shows that the calculated parameters are in good agreement with the tunneling parameters. The reinforcement measures of soil mass and the reinforcement measures of multi-arch tunnel structure during the construction of shield tunnel through parallel arch tunnel are briefly introduced and analyzed. The suggestion of providing safety control measures for similar crossing projects is a brief introduction to the site monitoring items, section and point arrangement, monitoring elements and monitoring results of crossing construction. Combined with the influence of tunnel construction on surface building (construction), according to the vertical displacement of arch roof of multi-arch tunnel before and after shield tunnel construction, the Japanese tunnel construction guide is used. The influence zoning method based on displacement criterion and strength criterion is put forward for the change of compressive stress of secondary lining concrete, which can be effectively partitioned in view of the influence of shield construction on the structure of new multi-arch tunnel. In the course of field construction, shield tunnel passes through the passage section safely, and there is no crack in the lining structure of the existing multi-arch tunnel, which indicates that the construction plan and measures adopted on the spot are reasonable and can solve the problems faced by the construction. It can be used for reference in the construction of similar subway tunnel in the future.
【學(xué)位授予單位】：長安大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：U455.43

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