本文選題：沉管隧道結(jié)構(gòu) + 粘彈性人工邊界　； 參考：《廣州大學(xué)》2017年碩士論文

【摘要】：隨著我國經(jīng)濟正在突飛猛進的發(fā)展,在這個過程中也伴隨著現(xiàn)代交通建設(shè)的發(fā)展,許多大型海底隧道工程已經(jīng)建成或正在建設(shè)規(guī)劃中,如瓊州跨海工程、港珠澳沉管隧道等。在修建這些工程的地區(qū),必定會存在一些高烈度地震區(qū),則對其抗震性能的研究必須受到重視。目前,在海底沉管隧道結(jié)構(gòu)抗震研究中,一方面,通常采用地震波垂直入射的方式對海底沉管隧道結(jié)構(gòu)進行動力響應(yīng)分析,但假定垂直入射的方式并不符合地震波入射的實際情況,而且會帶來不可忽略的誤差;另一方面,未考慮海水因素的影響,或雖然考慮了海水因素的影響,但卻未能真實反映實際工程情況。因此,考慮地震波斜入射與海水因素,既可以真實的反映沉管隧道結(jié)構(gòu)的破壞機制,又具有實際的工程意義。本文基于粘彈性人工邊界與有限元法相結(jié)合的波動分析方法,建立了海水—沉管隧道—海床的整體有限元分析模型,考慮了海水與海床的流固耦合動力反應(yīng),研究了地震波斜入射以及海水深度、沉管隧道結(jié)構(gòu)的埋置深度和海床土的彈性模量等因素對沉管隧道結(jié)構(gòu)動力反應(yīng)的影響。本文主要的研究內(nèi)容如下:首先,基于粘彈性人工邊界理論和外源波動輸入的方法,建立了二維地震動斜入射下人工邊界結(jié)點等效荷載的計算方法,應(yīng)用數(shù)學(xué)軟件matlab編制了等效地震結(jié)點荷載的計算程序,通過數(shù)值算例驗證了該計算方法與程序的準(zhǔn)確性和精度。其次,基于建立的海水—沉管隧道—海床的整體有限元分析模型,研究了地震P波垂直入射作用下,海水深度、沉管隧道結(jié)構(gòu)的埋置深度和海床土的彈性模量等因素對沉管隧道結(jié)構(gòu)動力反應(yīng)的影響程度和規(guī)律。然后,研究了地震P波斜入射作用下,不同入射角度對沉管隧道結(jié)構(gòu)的動力響應(yīng)影響特性,并討論了海水深度、沉管隧道結(jié)構(gòu)的埋置深度和海床土的彈性模量等因素對沉管隧道結(jié)構(gòu)動力反應(yīng)的影響程度和規(guī)律。與地震P波垂直入射作用下相比較,在海水深度、沉管隧道結(jié)構(gòu)的埋置深度和海床土的彈性模量對沉管隧道結(jié)構(gòu)的動力反應(yīng)影響方面,有著相同的影響趨勢,但影響的程度則不相同;另外,也得出了其他的相關(guān)有益結(jié)論。最后,研究了地震SV波斜入射作用下,不同入射角度對沉管隧道結(jié)構(gòu)的動力響應(yīng)影響特性,并討論了海水深度、沉管隧道結(jié)構(gòu)的埋置深度和海床土的彈性模量等因素對沉管隧道結(jié)構(gòu)動力反應(yīng)的影響程度和規(guī)律。本文研究了海底沉管隧道結(jié)構(gòu)的地震反應(yīng),合理解釋了沉管隧道結(jié)構(gòu)的動力反應(yīng)特性,可對沉管隧道結(jié)構(gòu)抗震設(shè)計方面提供參考依據(jù)。
[Abstract]:With the rapid development of China's economy and the development of modern traffic construction in this process, many large seabed tunnel projects have been built or are in the process of construction planning, such as the Qiongzhou sea crossing project, Hong Kong Zhuhai Macao immersed tunnel, and so on. In the construction of these projects, there will be some high intensity seismic areas. The research on seismic performance must be paid attention to. At present, on the one hand, the dynamic response of the submarine immersed tube tunnel is usually analyzed by the vertical incidence of seismic waves, but it is assumed that the mode of vertical incidence does not conform to the actual situation of the incident wave incident, and it will not be negligible. On the other hand, without considering the influence of sea water factors or considering the influence of sea water factors, it can not truly reflect the actual engineering situation. Therefore, considering the oblique incidence of seismic waves and the factors of sea water, it can not only reflect the damage mechanism of the tunnel structure of the immersed tube, but also have practical engineering significance. This paper is based on the viscoelastic artificial. The finite element analysis model of sea water immersed tube tunnel and seabed is established by the method of wave analysis combined with boundary and finite element method. The dynamic response of sea bed and sea bed is considered, the oblique incidence of seismic waves and depth of sea water, the buried depth of the tunnel structure and the elastic modulus of the seabed soil are studied. The main research contents of this paper are as follows: first, based on the viscoelastic artificial boundary theory and the method of external wave input, a calculation method for the equivalent load of the artificial boundary node under the oblique incidence of the two dimensional ground motion is established, and the calculation program of the equivalent seismic node load is compiled with the mathematical software MATLAB. The accuracy and accuracy of the method and program are verified by a numerical example. Secondly, based on the established finite element analysis model of the seawater immersed tunnel tunnel and seabed, the depth of sea water, the buried depth of the immersed tunnel tunnel structure and the elastic modulus of the sea bed soil are studied under the vertical incidence of the seismic P wave. The influence of the dynamic response on the dynamic response of the immersed tube tunnel under the oblique incidence of the earthquake P wave is studied. The influence of the depth of the sea water, the buried depth of the tunnel structure and the elastic modulus of the seabed soil on the dynamic response of the immersed tunnel structure are discussed. Law. Compared with the vertical incidence of the seismic P wave, the depth of the sea water, the buried depth of the immersed tunnel structure and the elastic modulus of the seabed soil have the same influence on the dynamic response of the immersed tunnel structure, but the degree of influence is different. In addition, other relevant useful conclusions are obtained. Finally, the research ground is made. The influence of different angle of incidence on the dynamic response of the immersed tube tunnel under the oblique incidence of SV wave, and the influence degree and law of the depth of sea water, the buried depth of the immersed tube tunnel structure and the elastic modulus of the seabed soil on the dynamic response of the immersed tunnel tunnel are discussed. It should reasonably explain the dynamic response characteristics of immersed tube tunnel structure, and provide reference for aseismic design of immersed tunnel structure.
【學(xué)位授予單位】：廣州大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：U459.5;U452.28

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本文編號：1998530