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

【摘要】：我國的水工隧洞建設正處于蓬勃發(fā)展的狀態(tài),有些方面的技術已處于國際領先水平,但是在隧洞的施工及襯砌技術上,與國外相比還有些不足。近年來,我國隧洞開挖及襯砌技術發(fā)展迅猛,由于TBM掘進技術有著諸多優(yōu)點,目前已成為我國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全斷面掘進預制管片襯砌的特性,開展TBM預制混凝土管片配合比設計與優(yōu)化及襯砌管片的穩(wěn)定性評價,主要進行以下幾個方面的研究：(1)TBM預制混凝土管片配合比設計與優(yōu)化,基于天然料場骨料質量評價,在掌握水泥、水、摻合料、外加劑理化性能的基礎上,為使混凝土在經濟性、工作性、強度等方面達到最優(yōu),分別利用主成分分析法和功效函數法對混凝土管片配合比進行了優(yōu)化,且兩種方法的優(yōu)化結果相近。(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,本文對水工隧道上的圍巖壓力計算方式根據實際工程進行了詳細的計算,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)定性評價,在有限元分析軟件ANSYS中建立二維及三維隧洞、管片結構模型的基礎上,模擬計算工況荷載作用下襯砌結構受力特點,得到管片襯砌內的等效應力和最大、最小主應力分布,以及管片襯砌內各點的位移變形分布,掌握該TBM掘進隧洞管片襯砌結構易發(fā)生集中應力和位移變形部位,可能會導致發(fā)生的裂縫、錯臺以及邊角破碎現象。依據受力分析結果,評價了管片受力的穩(wěn)定性。綜上,以試驗檢測為平臺,通過理論分析、室內實驗、現場調查相結合的方法,來研究TBM預制混凝土管片配合比設計與優(yōu)化以及襯砌管片的穩(wěn)定性分析,其成果為TBM掘進技術在我省水工隧洞中的應用提供技術儲備和科技支撐。本文應用主成分分析法和功效函數法優(yōu)化原理,分別選取不同的評價指標,對優(yōu)化C45混凝土管片配合比均能起到較好的效果。利用ANSYS有限元軟件對優(yōu)化后的混凝土管片襯砌結構的受力情況,進行實際工況模擬分析,得出了一些結論,對水工隧洞的施工具有一定的指導意義。
[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.

【學位授予單位】：甘肅農業(yè)大學
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：TV554
，

本文編號：1743803