本文選題：混凝土面板堆石壩 + 改進(jìn)一次二階矩法��； 參考：《北京交通大學(xué)》2014年碩士論文

【摘要】：目前我國混凝土面板堆石壩的發(fā)展正面臨著從200m級(jí)壩高向300m級(jí)壩高發(fā)展的技術(shù)挑戰(zhàn),開展大壩變形可靠度分析是進(jìn)行大壩安全分析和評(píng)價(jià)的有效手段與發(fā)展方向。本文首先對(duì)可靠度計(jì)算方法進(jìn)行了研究,對(duì)最大熵法、改進(jìn)一次二階矩、響應(yīng)面法、蒙特卡羅法以及Rosenblueth法等常見的結(jié)構(gòu)可靠性分析方法的基本原理及其改進(jìn)方法進(jìn)行了介紹,研究了各種方法的優(yōu)缺點(diǎn)和適用范圍,提出了控制積分區(qū)間長度、采用遺傳算法和matlab fsolve函數(shù)相結(jié)合的方程組求解方法,提高了最大熵法求解成功率。 本文旨在提出一套混凝土面板堆石壩風(fēng)險(xiǎn)分析分析的方法并對(duì)壩體變形可靠性進(jìn)行研究。本文首先在陳祖煜院士改進(jìn)一次二階矩法的基礎(chǔ)上,將一次二階矩法與數(shù)值計(jì)算程序有機(jī)結(jié)合,將改進(jìn)一次二階矩法引入復(fù)雜結(jié)構(gòu)可靠性分析領(lǐng)域,與目前常用的響應(yīng)面法相比,該方法具有收斂性好、計(jì)算精度高、計(jì)算效率高的優(yōu)點(diǎn)。然后本文中通過將改進(jìn)一次二階矩法與Rosenblueth法相結(jié)合提出了一套評(píng)價(jià)混凝土面板堆石壩風(fēng)險(xiǎn)水平的方法,并對(duì)一座300m級(jí)典型混凝土面板堆石壩壩截面豎向沉降變形和撓曲變形的變形特性進(jìn)行了分析研究,研究表明鄧肯-張E-B模型參數(shù)(?)0、Rf、n、K、(?)、m、Kb、Kur,(其中(?)0、(?)為材料強(qiáng)度參數(shù),n、K為切線模量試驗(yàn)常數(shù),m、Kb為體積模量試驗(yàn)常數(shù),Rf為破壞比,Kur為卸載-再加載模量試驗(yàn)常數(shù)),對(duì)壩體變形的影響較為復(fù)雜,與參數(shù)值、參考點(diǎn)位置、變形類別都有關(guān)系,對(duì)于水平變形敏感性按照(/)0、Rf、n、K、(?)、m、Kb、Kur的順序逐漸減小,對(duì)于豎向沉降不同位置處參數(shù)敏感性排序不同,(/)0、Kb島、m、Rf是影響豎向變形的主要因素。本文最后還對(duì)竣工期和蓄水期300m級(jí)混凝土面板堆石壩壩體沉降變形可靠指標(biāo)以及面板撓曲變形可靠指標(biāo)對(duì)(/)0、Rf、K、(?)、Kb這五個(gè)參數(shù)的變異系數(shù)進(jìn)行了敏感性分析,通過分析計(jì)算發(fā)現(xiàn)Kb、(?)0的變異系數(shù)對(duì)沉降變形可靠指標(biāo)的影響遠(yuǎn)大于其它三個(gè)因素,而(?)O、Rf變異系數(shù)對(duì)沉降變形可靠指標(biāo)影響很小,而對(duì)于面板撓曲變形可靠指標(biāo)其敏感性按照K、(?)0、Rf、Kb、(?)的順序遞減,K、(?)0的變異性是影響面板撓曲變形可靠指標(biāo)的主要因素。
[Abstract]:At present, the development of concrete face rockfill dam in China is facing the technical challenge from 200m dam height to 300m dam height. The reliability analysis of dam deformation is an effective means and development direction for dam safety analysis and evaluation. In this paper, the reliability calculation methods are studied. The basic principles and improved methods of reliability analysis of structures such as the maximum entropy method, the improved first order moment method, the response surface method, the Monte Carlo method and the Rosenblueth method are introduced. The advantages and disadvantages of various methods and their application range are studied. The control integral interval length is proposed. The method of solving equations based on genetic algorithm and matlab fsolve function is used to improve the success rate of maximum entropy method. The purpose of this paper is to put forward a set of risk analysis method for concrete faced rockfill dam and to study the reliability of dam deformation. In this paper, on the basis of academician Chen Zuyu's improved first-order second-moment method, the first-order second-moment method is combined with the numerical calculation program, and the improved first-order second-moment method is introduced into the field of reliability analysis of complex structures. Compared with the commonly used response surface method, this method has the advantages of good convergence, high accuracy and high efficiency. Then, by combining the improved first-order second moment method with Rosenblueth method, a set of methods to evaluate the risk level of concrete faced rockfill dam is proposed. The deformation characteristics of vertical settlement and flexural deformation of the section of a 300m typical concrete face rockfill dam are analyzed and studied. The results show that the parameters of Duncan Zhang E-B model are (?) 0 / RfN / K, (?) / (?) Kbn, (?) _ 0, (?) _ _ _ For the material strength parameter (K) as the tangent modulus test constant and K b as the volume modulus test constant and R f as the failure ratio Kur as the unloading and reloading modulus test constant, the influence on the deformation of the dam body is more complex, and the parameter value, the reference point position, and so on. There is a relationship between the deformation types and the sensitivity of horizontal deformation according to the order of (/) 0, (?) mKb Kur, and the order of sensitivity to the parameters at different positions of vertical settlement is different, and (/) 0 Kb island MRC f is the main factor affecting the vertical deformation. Finally, the sensitivity analysis of the reliability index of settlement deformation of 300m class concrete face rockfill dam and the reliability index of flexural deformation of face slab to the five parameters of (/) 0 ~ (0) ~ (?) K, (?) K _ b are carried out in the last part of this paper. Through analysis and calculation, it is found that the coefficient of variation of Kb, (?) 0 has much greater influence on the reliability index of settlement deformation than the other three factors, while the coefficient of variation of Orogen RF has little effect on the reliability index of subsidence deformation, but the sensitivity of reliability index for flexural deformation of face slab is according to K, (?) 0 / RfN Kb, (?) The variability of K, (?) 0 is the main factor that affects the reliability index of the flexural deformation of the face plate.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TV31;TV641.43

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