本文選題：山嶺隧道　切入點：數(shù)值模擬　出處：《西南交通大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著我國西部開發(fā)的不斷推進,大量的隧道工程被修建在西部高烈度地震區(qū),從國內(nèi)外的歷次大地震中可以看出,山嶺隧道在強震作用下也會發(fā)生嚴重破壞,因此開展強震作用下山嶺隧道抗減震方面的研究己成為目前科學(xué)界和工程界的熱門課題之一�；诖吮尘�,本文以ABAQUS大型有限元軟件為平臺,開發(fā)了地震動計算中的自由場邊界,并通過數(shù)值模擬的方法對山嶺隧道結(jié)構(gòu)在地震動作用下的損傷演化進行了初步分析,具體研究內(nèi)容如下：(1)對ABAQUS動力有限元分析的基本理論進行介紹。著重介紹了直接積分中的隱式積分法、非線性求解時所采用的Newton-Raphson法；然后對ABAQUS中的混凝土塑性損傷本構(gòu)模型進行了介紹；(2)對近場波動數(shù)值模擬中的關(guān)鍵問題：動力人工邊界和地震動輸入,進行了詳細介紹,對幾種常見的動力人工邊界及其相應(yīng)的地震動輸入方法進行了推導(dǎo),從而明確了動力問題數(shù)值計算的關(guān)鍵內(nèi)容；(3)基于有限元方法的基本思路,將粘性邊界和自由場地震動輸入相耦合,推導(dǎo)得到了自由場邊界單元的力學(xué)性質(zhì),然后利用Fortran語言,通過ABAQUS軟件的UEL二次開發(fā)接口,實現(xiàn)了自由場邊界單元的程序開發(fā),最后以算例的形式對自由場邊界單元的模擬效果進行了驗證；(4)結(jié)合汶川地震中隧道結(jié)構(gòu)破壞情況,采用數(shù)值模擬的方法,對隧道結(jié)構(gòu)在強震下的損傷演化過程進行了分析,得到水平剪切波和豎向壓縮波分別作用下隧道結(jié)構(gòu)的漸進性破壞過程,明確了不同波型下隧道結(jié)構(gòu)的薄弱部位和破壞特征。
[Abstract]:With the continuous development of western China, a large number of tunnel projects have been built in the high intensity earthquake areas in the west of China. It can be seen from all the major earthquakes at home and abroad that the mountain tunnels will also be seriously damaged under the action of strong earthquakes. Therefore, it has become one of the hot topics in the scientific and engineering fields to study the earthquake resistance of mountain tunnel under strong earthquake. Based on this background, this paper takes ABAQUS large-scale finite element software as the platform. The free field boundary in the calculation of ground motion is developed, and the damage evolution of mountain tunnel structure under the action of ground motion is analyzed preliminarily by means of numerical simulation. The main contents of this paper are as follows: (1) the basic theory of ABAQUS dynamic finite element analysis is introduced. The implicit integral method in direct integration and the Newton-Raphson method in nonlinear solution are introduced. Then the plastic damage constitutive model of concrete in ABAQUS is introduced. The key problems in numerical simulation of near-field wave are introduced in detail: dynamic artificial boundary and ground motion input. In this paper, several common dynamic artificial boundaries and their corresponding seismic input methods are derived, and the key content of numerical calculation of dynamic problems is clarified. The mechanical properties of the free field boundary element are derived by coupling the viscous boundary and the vibration input of the free site. Then the program development of the free field boundary element is realized by using Fortran language and the UEL secondary development interface of ABAQUS software. Finally, the simulation results of free field boundary element are verified by a numerical example. Combined with the failure of tunnel structure in Wenchuan earthquake, the damage evolution process of tunnel structure under strong earthquake is analyzed by numerical simulation. The progressive failure process of tunnel structure under the action of horizontal shear wave and vertical compression wave is obtained, and the weak position and failure characteristics of tunnel structure under different wave patterns are clarified.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U451
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本文編號：1596482