本文選題：輸水隧洞　切入點(diǎn)：淺埋暗挖法　出處：《清華大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：大型地下輸水涵洞普遍應(yīng)用于水利市政工程,其復(fù)合襯砌結(jié)構(gòu)的選擇和設(shè)計(jì)不僅關(guān)系著工程的安全,而且對控制工程投資具有重要意義。由于受地質(zhì)結(jié)構(gòu)和施工工藝的影響,其結(jié)構(gòu)受力十分復(fù)雜,目前沒有明確計(jì)算理論和方法,每個項(xiàng)目使用的構(gòu)造方法、計(jì)算理論、計(jì)算方法不盡相同,結(jié)果差異較大。其結(jié)果不是造成投資浪費(fèi)就是存在結(jié)構(gòu)安全隱患。本文系統(tǒng)論述了大型地下輸水涵洞施工工法選擇、結(jié)構(gòu)形式選定等重要設(shè)計(jì)要點(diǎn)。并以南水北調(diào)中線工程北京段西四環(huán)暗涵工程淺埋暗挖輸水隧洞為工程案例,對雙層襯砌結(jié)構(gòu)的結(jié)構(gòu)型式,施工工法,結(jié)構(gòu)設(shè)計(jì)理論及計(jì)算方法,監(jiān)測資料等進(jìn)行了研究。提出了大型地下輸水涵洞結(jié)構(gòu)設(shè)計(jì)和優(yōu)化的思路是:工程類比、結(jié)構(gòu)力學(xué)和有限元計(jì)算、有限元分析優(yōu)化、監(jiān)測數(shù)據(jù)反演。首先,根據(jù)工程的規(guī)模和地質(zhì)條件,采用類比法初步確定初期支護(hù)的厚度、強(qiáng)度、配筋等重要結(jié)構(gòu)參數(shù),并擬定施工步序和施工輔助措施。第二步,采用結(jié)構(gòu)力學(xué)法手段驗(yàn)算初步選定的結(jié)構(gòu)參數(shù)和步序的合理性。同時建立適用于不同地質(zhì)情況、不同一襯形式的理論計(jì)算模型,推導(dǎo)出符合工程實(shí)際的理論計(jì)算方法,進(jìn)行不同工況條件下的襯砌內(nèi)力計(jì)算及配筋理論分析。第三步,采用數(shù)值模擬方法,建立符合工程實(shí)際的二維及三維有限元數(shù)值模型,對輸水涵洞結(jié)構(gòu)進(jìn)行數(shù)值模擬分析,獲得輸水涵洞襯砌整體的應(yīng)力應(yīng)變規(guī)律,對結(jié)構(gòu)力學(xué)法計(jì)算成果進(jìn)行分析、復(fù)核,為復(fù)合襯砌結(jié)構(gòu)優(yōu)化提供依據(jù)。據(jù)此,初步得出了工程結(jié)構(gòu)的優(yōu)化值和優(yōu)化參數(shù)。第四步,進(jìn)行綜合分析比選,調(diào)整結(jié)構(gòu)參數(shù)。通過模擬計(jì)算研究對復(fù)合襯砌一襯和二襯進(jìn)行結(jié)構(gòu)設(shè)計(jì)優(yōu)化的可能性;分析了計(jì)算結(jié)果對計(jì)算參數(shù)的敏感性;研究了復(fù)合襯砌聯(lián)合受力結(jié)構(gòu)的傳力特點(diǎn);說明了輸水隧洞結(jié)構(gòu)防水設(shè)計(jì)應(yīng)重點(diǎn)關(guān)注的內(nèi)容。此外,通過對現(xiàn)場施工期及運(yùn)行期的監(jiān)測數(shù)據(jù)結(jié)果進(jìn)行分析,探討襯砌結(jié)構(gòu)的受力狀態(tài)以及應(yīng)力變形機(jī)理。進(jìn)一步印證結(jié)構(gòu)設(shè)計(jì)的安全性及計(jì)算假定的合理性。通過監(jiān)測值與計(jì)算值的對比分析,得出了一二襯受力的分?jǐn)偙壤敖Y(jié)構(gòu)優(yōu)化路徑。發(fā)現(xiàn)二襯受力分?jǐn)偙壤梢杂?4%降低到34%。各種研究方法結(jié)合使用,保證工程結(jié)構(gòu)設(shè)計(jì)的安全合理,研究提出工程的安全度和優(yōu)化空間。本文可供水利、地鐵、市政工程設(shè)計(jì)人員借鑒。在理論、方法上具有指導(dǎo)意義。
[Abstract]:Large underground water conveyance culverts are widely used in municipal water conservancy projects. The selection and design of composite lining structures are not only related to the safety of engineering, but also important to the control of project investment. Due to the influence of geological structure and construction technology, the underground water conveyance culverts are widely used in municipal water conservancy projects. At present, there is no definite calculation theory and method. The construction method, calculation theory and calculation method used in each project are different. The results are quite different. The result is either a waste of investment or a hidden danger of structural safety. This paper systematically discusses the selection of construction methods for large underground water conveyance culverts. Some important design points, such as the selection of structure form, etc., and taking the west fourth ring undercut tunnel in Beijing section of South-to-North Water transfer Project as an engineering case, the structure type and construction method of double-layer lining structure are discussed. The structural design theory and calculation method, monitoring data and so on are studied. The ideas of structural design and optimization for large underground water conveyance culverts are as follows: engineering analogy, structural mechanics and finite element calculation, finite element analysis and optimization, etc. First of all, according to the scale and geological conditions of the project, the main structural parameters such as the thickness, strength and reinforcement of the initial support are preliminarily determined by analogy method, and the construction sequence and construction auxiliary measures are drawn up. The structural mechanics method is used to check the rationality of the preliminary selected structural parameters and sequence. At the same time, the theoretical calculation model suitable for different geological conditions and different lining forms is established, and the theoretical calculation method is derived, which accords with the engineering practice. The internal force calculation and reinforcement theory analysis of lining under different working conditions are carried out. In the third step, the 2D and 3D finite element numerical models, which are in accordance with the engineering practice, are established by using numerical simulation method, and the structure of the culvert is numerically simulated and analyzed. The stress-strain law of the whole lining of water conveyance culvert is obtained, and the calculation results of structural mechanics method are analyzed and checked to provide the basis for optimization of composite lining structure. Based on this, the optimized values and parameters of engineering structure are preliminarily obtained. 4th steps are obtained. The possibility of structural design optimization for the first and second linings of composite lining is studied by simulation calculation, and the sensitivity of the calculation results to the calculation parameters is analyzed. This paper studies the force transfer characteristics of composite lining combined force structure, explains the main contents of waterproofing design of water conveyance tunnel structure, and analyzes the monitoring data of site construction and operation period. The stress state and stress deformation mechanism of lining structure are discussed. The safety of structure design and the rationality of calculation assumption are further confirmed. It is found that the distribution ratio of two lining forces can be reduced from 54% to 34. All kinds of research methods are combined to ensure the safety and reasonableness of engineering structure design. This paper can be used for reference by designers of water conservancy, subway and municipal engineering. It is of guiding significance in theory and method.
【學(xué)位授予單位】：清華大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TV672

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