基于時變效應(yīng)的盾構(gòu)隧道襯砌結(jié)構(gòu)分析方法的研究
發(fā)布時間：2018-08-27 08:48
【摘要】：近幾十年來，我國經(jīng)歷了日新月異的變化，很多方面都可以與世界接軌。在經(jīng)濟迅猛發(fā)展的大背景下，省時、高效率的地鐵運輸系統(tǒng)在我國主要城市得到了快速發(fā)展。在各種隧道施工方法中，盾構(gòu)法隧道雖然起步較晚，但其以自身獨有的優(yōu)勢在隧道施工中得到廣泛應(yīng)用，與此同時與盾構(gòu)隧道建設(shè)相適應(yīng)的襯砌結(jié)構(gòu)設(shè)計理論也在發(fā)展和進步。目前，國內(nèi)外在盾構(gòu)襯砌結(jié)構(gòu)設(shè)計的研究集中在設(shè)計模型的選取和論證方面。但在具體的工程中，影響結(jié)構(gòu)性能的因素多樣化使得結(jié)構(gòu)設(shè)計者在計算時全面系統(tǒng)的考慮到各種影響因素是不太容易實現(xiàn)的。對于混凝土結(jié)構(gòu)的一大特性—時變效應(yīng)在各個襯砌計算模型中沒有明確的體現(xiàn)�；炷潦湛s徐變效應(yīng)對盾構(gòu)隧道襯砌結(jié)構(gòu)的影響程度及在設(shè)計時如何考慮這種影響亟待系統(tǒng)和深入的研究。本文在荷載-結(jié)構(gòu)法的基礎(chǔ)上采用理論分析和數(shù)值模擬兩種方法，分別對襯砌結(jié)構(gòu)在荷載長期作用下的時變效應(yīng)進行分析計算，主要內(nèi)容包括: 1.對國內(nèi)外襯砌結(jié)構(gòu)設(shè)計理論的發(fā)展和應(yīng)用狀況進行了歸納和分析，介紹了現(xiàn)階段在襯砌設(shè)計領(lǐng)域研究進展，根據(jù)已有的研究成果提出了本文的研究內(nèi)容和預(yù)期成果。 2.基于慣用法和修正慣用法中均質(zhì)圓環(huán)結(jié)構(gòu)模型，結(jié)合混凝土收縮徐變計算模型，計算考慮荷載長期作用下混凝土時變效應(yīng)對均質(zhì)圓環(huán)結(jié)構(gòu)模型中剛度有效率的影響，提出對均質(zhì)圓環(huán)結(jié)構(gòu)考慮時變效應(yīng)影響的修正分析方法。 3.在上一步研究的基礎(chǔ)上，考慮接頭的存在對襯砌圓環(huán)長期剛度的影響情況，采用連續(xù)不均勻模型計算時變效應(yīng)作用下襯砌結(jié)構(gòu)的變形，并與均質(zhì)圓環(huán)結(jié)構(gòu)模型計算的結(jié)果進行對比分析，討論接頭效應(yīng)對襯砌結(jié)構(gòu)的影響程度。 4.結(jié)合具體工程，利用ANSYS有限元軟件進行數(shù)值模擬計算，，分析時變效應(yīng)影響下的均質(zhì)圓環(huán)模型和考慮接頭的連續(xù)非均勻模型的襯砌內(nèi)力變形值，以此來驗證理論結(jié)果的可行性。
[Abstract]:In recent decades, China has undergone rapid changes, many aspects can be in line with the world. Under the background of rapid economic development, time-saving and efficient subway transportation system in China's major cities has been developed rapidly. At present, the research of shield tunnel lining structure design at home and abroad is focused on the selection and demonstration of design model. But in specific projects, the factors affecting the structural performance are diversified. It is not easy for a tunnel designer to consider all kinds of influencing factors systematically in the calculation. The time-varying effect, a major characteristic of concrete structure, is not clearly reflected in all lining calculation models. The influence of shrinkage and creep of concrete on the structure of shield tunnel lining and how to consider this effect in design. Based on the load-structure method, the time-varying effect of lining structure under long-term load is analyzed and calculated by means of theoretical analysis and numerical simulation.
1. The development and application of lining structure design theory at home and abroad are summarized and analyzed. The research progress in the field of lining design at present is introduced. Based on the existing research results, the research contents and expected results of this paper are put forward.
2. Based on the homogeneous ring structure model of the conventional method and the modified conventional method, combined with the concrete shrinkage and creep calculation model, the influence of the concrete time-varying effect on the stiffness efficiency of the homogeneous ring structure model considering the long-term load is calculated, and the modified analysis method considering the time-varying effect for the homogeneous ring structure is proposed.
3. On the basis of the previous study, considering the influence of the joint on the long-term stiffness of lining ring, the deformation of lining structure under time-varying effect is calculated by using the continuous inhomogeneous model, and the results are compared with those calculated by the homogeneous ring structure model. The influence of the joint effect on the lining structure is discussed.
4. Combining with the concrete project, the finite element software ANSYS is used to simulate and calculate the deformation value of lining internal force under the influence of time-varying effect and considering the continuous inhomogeneous model of joints, so as to verify the feasibility of the theoretical results.
【學位授予單位】：河南科技大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U451.4
本文編號：2206726
[Abstract]:In recent decades, China has undergone rapid changes, many aspects can be in line with the world. Under the background of rapid economic development, time-saving and efficient subway transportation system in China's major cities has been developed rapidly. At present, the research of shield tunnel lining structure design at home and abroad is focused on the selection and demonstration of design model. But in specific projects, the factors affecting the structural performance are diversified. It is not easy for a tunnel designer to consider all kinds of influencing factors systematically in the calculation. The time-varying effect, a major characteristic of concrete structure, is not clearly reflected in all lining calculation models. The influence of shrinkage and creep of concrete on the structure of shield tunnel lining and how to consider this effect in design. Based on the load-structure method, the time-varying effect of lining structure under long-term load is analyzed and calculated by means of theoretical analysis and numerical simulation.
1. The development and application of lining structure design theory at home and abroad are summarized and analyzed. The research progress in the field of lining design at present is introduced. Based on the existing research results, the research contents and expected results of this paper are put forward.
2. Based on the homogeneous ring structure model of the conventional method and the modified conventional method, combined with the concrete shrinkage and creep calculation model, the influence of the concrete time-varying effect on the stiffness efficiency of the homogeneous ring structure model considering the long-term load is calculated, and the modified analysis method considering the time-varying effect for the homogeneous ring structure is proposed.
3. On the basis of the previous study, considering the influence of the joint on the long-term stiffness of lining ring, the deformation of lining structure under time-varying effect is calculated by using the continuous inhomogeneous model, and the results are compared with those calculated by the homogeneous ring structure model. The influence of the joint effect on the lining structure is discussed.
4. Combining with the concrete project, the finite element software ANSYS is used to simulate and calculate the deformation value of lining internal force under the influence of time-varying effect and considering the continuous inhomogeneous model of joints, so as to verify the feasibility of the theoretical results.
【學位授予單位】：河南科技大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U451.4
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