本文選題：水工隧洞 + 混凝土配合比��； 參考：《甘肅農(nóng)業(yè)大學(xué)》2016年碩士論文

【摘要】：我國(guó)的水工隧洞建設(shè)正處于蓬勃發(fā)展的狀態(tài),有些方面的技術(shù)已處于國(guó)際領(lǐng)先水平,但是在隧洞的施工及襯砌技術(shù)上,與國(guó)外相比還有些不足。近年來(lái),我國(guó)隧洞開(kāi)挖及襯砌技術(shù)發(fā)展迅猛,由于TBM掘進(jìn)技術(shù)有著諸多優(yōu)點(diǎn),目前已成為我國(guó)隧道施工的主要方法。本文以引洮供水一期工程7#隧洞為基礎(chǔ)建立模型,基于7#隧洞所屬濕陷性黃土區(qū)及TBM全斷面掘進(jìn)預(yù)制管片襯砌的特性,開(kāi)展TBM預(yù)制混凝土管片配合比設(shè)計(jì)與優(yōu)化及襯砌管片的穩(wěn)定性評(píng)價(jià),主要進(jìn)行以下幾個(gè)方面的研究：(1)TBM預(yù)制混凝土管片配合比設(shè)計(jì)與優(yōu)化,基于天然料場(chǎng)骨料質(zhì)量評(píng)價(jià),在掌握水泥、水、摻合料、外加劑理化性能的基礎(chǔ)上,為使混凝土在經(jīng)濟(jì)性、工作性、強(qiáng)度等方面達(dá)到最優(yōu),分別利用主成分分析法和功效函數(shù)法對(duì)混凝土管片配合比進(jìn)行了優(yōu)化,且兩種方法的優(yōu)化結(jié)果相近。(2)襯砌管片受力分析,管片襯砌上的圍巖壓力是管片承受的主要荷載,本文對(duì)水工隧道上的圍巖壓力計(jì)算方式根據(jù)實(shí)際工程進(jìn)行了詳細(xì)的計(jì)算,并確定了其合理的取值。(3)優(yōu)化后混凝土襯砌管片的穩(wěn)定性評(píng)價(jià),在有限元分析軟件ANSYS中建立二維及三維隧洞、管片結(jié)構(gòu)模型的基礎(chǔ)上,模擬計(jì)算工況荷載作用下襯砌結(jié)構(gòu)受力特點(diǎn),得到管片襯砌內(nèi)的等效應(yīng)力和最大、最小主應(yīng)力分布,以及管片襯砌內(nèi)各點(diǎn)的位移變形分布,掌握該TBM掘進(jìn)隧洞管片襯砌結(jié)構(gòu)易發(fā)生集中應(yīng)力和位移變形部位,可能會(huì)導(dǎo)致發(fā)生的裂縫、錯(cuò)臺(tái)以及邊角破碎現(xiàn)象。依據(jù)受力分析結(jié)果,評(píng)價(jià)了管片受力的穩(wěn)定性。綜上,以試驗(yàn)檢測(cè)為平臺(tái),通過(guò)理論分析、室內(nèi)實(shí)驗(yàn)、現(xiàn)場(chǎng)調(diào)查相結(jié)合的方法,來(lái)研究TBM預(yù)制混凝土管片配合比設(shè)計(jì)與優(yōu)化以及襯砌管片的穩(wěn)定性分析,其成果為TBM掘進(jìn)技術(shù)在我省水工隧洞中的應(yīng)用提供技術(shù)儲(chǔ)備和科技支撐。本文應(yīng)用主成分分析法和功效函數(shù)法優(yōu)化原理,分別選取不同的評(píng)價(jià)指標(biāo),對(duì)優(yōu)化C45混凝土管片配合比均能起到較好的效果。利用ANSYS有限元軟件對(duì)優(yōu)化后的混凝土管片襯砌結(jié)構(gòu)的受力情況,進(jìn)行實(shí)際工況模擬分析,得出了一些結(jié)論,對(duì)水工隧洞的施工具有一定的指導(dǎo)意義。
[Abstract]:The construction of hydraulic tunnel in China is in a booming state, some aspects of the technology has reached the international advanced level, but in the construction and lining of tunnel technology, compared with foreign countries has some shortcomings. In recent years, the development of tunnel excavation and lining technology in China rapidly, due to the TBM tunneling technology has many advantages, at present has become the main method of tunnel construction in China. Based on the Taohe River Water Transfer Project 7# tunnel model as the foundation, characteristics of collapsible loess and TBM TBM precast lining of 7# tunnel is carried out based on the TBM of precast concrete segments, mix design and stability evaluation and optimization of lining, the main for the following research: (1) compared with the TBM design and optimization of precast concrete segments, natural aggregates quality evaluation based on the grasp of water, cement, admixture, admixture physicochemical properties On the basis of the concrete work in the economy, and achieve the optimal strength, using principal component analysis method and efficacy coefficient method to optimize the concrete mix ratio segment, and two kinds of optimization methods, similar results. (2) stress analysis of lining and surrounding rock pressure on the lining is the main load bearing segment, the calculation of surrounding rock pressure hydraulic tunnel on the way are calculated in detail according to the actual engineering, and determine its reasonable value. (3) the stability evaluation of concrete lining after optimization, building 2D and 3D tunnel in the finite element analysis software ANSYS, based on the model of segment structure the simulation calculation, the stress characteristics of lining structure under the effect of load, the equivalent stress in the lining and the maximum and minimum principal stress distribution and displacement of each point in the lining deformation distribution, the TBM The lining structure of tunnel is prone to concentrated stress and displacement and deformation of parts, may lead to crack, dislocation and edge breakage. According to the stress analysis results, to evaluate the stability of segment stress. Therefore, in order to test the platform, through theoretical analysis, laboratory experiment method, combining the field investigation the study of TBM precast concrete segments, mix design and optimization and stability of lining segment analysis, the results provide technical reserves and technical support for the application of TBM tunneling technology in our province in the tunnel. The analysis method and effect function method optimization based on the principle of principal components were selected for different evaluation indexes, to optimize the C45 the concrete segment mix can play a better effect. By using the finite element software ANSYS stress on concrete lining structure after optimization, simulated the actual conditions In addition, some conclusions have been obtained, which have certain guiding significance for the construction of hydraulic tunnel.

【學(xué)位授予單位】：甘肅農(nóng)業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：TV554
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本文編號(hào)：1743803