【摘要】：伴隨著眾多工后問題的出現(xiàn)，交通荷載對道路各結(jié)構(gòu)層的動態(tài)響應(yīng)研究已經(jīng)成為工程界特別關(guān)注的問題之一，也是學(xué)術(shù)界一直以來重點研究課題。經(jīng)濟的發(fā)展、出行率的提高、生活節(jié)奏的加快使修筑于軟土路基上的高速公路越來越多，與此同時出現(xiàn)的工后問題也備受關(guān)注。介于軟土壓縮性高且強度低的特點以及交通荷載的動態(tài)性和長期性，加大了交通荷載作用下對道路動態(tài)響應(yīng)研究的難度，并且路基與地基是協(xié)同工作、共同影響的有機整體，在交通荷載作用下的共同變形特性也是一個值得去探究的問題。 考慮到軟土壓縮性高且強度低的特點以及交通荷載的動態(tài)性和長期性，現(xiàn)行的假設(shè)路基為線彈性多層體系以及將交通荷載等效為靜載的理論缺乏一定的說服力，，與實際工況相差較遠。因此，對交通荷載的研究迫切從靜態(tài)過渡到動態(tài)，土基、地基采用彈塑性模型顯得更復(fù)合實際情況。 本文主要分為以下五部分內(nèi)容： 本文首先根據(jù)實際工程案例提出本文研究的目的及意義，從理論研究進展、現(xiàn)場試驗進展、數(shù)值分析進展三方面介紹了目前交通荷載對道路作用的研究現(xiàn)狀。 第二部分接著介紹了數(shù)值計算的理論基礎(chǔ)，首先簡單描述了軟土、路面材料的動力特性，闡述了適合軟土體材料的本構(gòu)模型，然后介紹了交通荷載的特性并確定了合適的簡化模型。 第三部分根據(jù)已有的數(shù)值計算的理論基礎(chǔ)，以典型軟土地基各結(jié)構(gòu)層為例，建立道路三維模型.本文采用雙層地基模型模擬加固處理后理后的軟土地基，面層、基層采用線彈性本構(gòu)關(guān)系，土基及復(fù)合地基采用彈塑性本構(gòu)關(guān)系，應(yīng)用有限元軟件編制有限元分析程序，采用三維動力有限元單元法對道路及復(fù)合地基在交通荷載作用下進行瞬態(tài)分析。 第四部分從單雙車道車輛荷載為切入點，對比分析單獨車輛荷載行駛時對道路結(jié)構(gòu)體系的影響與雙車道車輛荷載行駛時對道路結(jié)構(gòu)體系影響的差別，對比分析車輛荷載作用對道路動態(tài)響應(yīng)的疊加效應(yīng)。 第五部分針對目前道路病害產(chǎn)生的主要原因，以單獨車輛荷載作用為前提，從行車速度、車輛超載率這兩方面研究了車輛荷載對道路及復(fù)合地基各結(jié)構(gòu)層動力響應(yīng)規(guī)律。
[Abstract]:With the emergence of many post-work problems, the study of the dynamic response of traffic load to each layer of road structure has become one of the issues of special concern in the engineering field, and has always been a key research topic in academic circles. With the development of economy, the increase of travel rate and the quickening of life rhythm, more and more highways are built on soft soil roadbed. Between the characteristics of high compressibility and low strength of soft soil and the dynamic and long-term nature of traffic load, it is more difficult to study the dynamic response of road under traffic load, and the roadbed and foundation work together as an organic whole. The characteristics of common deformation under traffic load is also a problem worth exploring. Considering the characteristics of high compressibility and low strength of soft soil and the dynamic and long-term nature of traffic load, the theory that the roadbed is assumed to be a linear elastic multistory system and traffic load is equivalent to static load is not convincing enough. It is far from the actual working condition. Therefore, the study of traffic load is urgent from static to dynamic. The elastoplastic model of soil foundation and foundation is more complex. This paper is divided into the following five parts: firstly, according to the actual engineering cases, this paper puts forward the purpose and significance of this study, from the theoretical research progress, field test progress, The research status of traffic load on road is introduced in three aspects. In the second part, the theoretical basis of numerical calculation is introduced. Firstly, the dynamic characteristics of soft soil and pavement materials are briefly described, and the constitutive model suitable for soft soil material is described. Then the characteristics of traffic load are introduced and a suitable simplified model is determined. In the third part, according to the theoretical foundation of numerical calculation, the 3D model of road is established by taking the typical soft soil foundation as an example. In this paper, the model of double layer foundation is used to simulate the linear elastic constitutive relation of the soft soil foundation, the surface layer and the base course, the elastoplastic constitutive relation of the soil foundation and the composite foundation is simulated, and the finite element analysis program is compiled by using the finite element software. The transient analysis of road and composite foundation under traffic load is carried out by using three dimensional dynamic finite element method. In the fourth part, from the point of view of single and double lane vehicle load, the influence of single vehicle load on road structure system is compared with that of dual lane vehicle load on road structure system. The superposition effect of vehicle load on road dynamic response is analyzed. In the fifth part, according to the main causes of road disease at present, the dynamic response law of vehicle load to each structure layer of road and composite foundation is studied from two aspects of driving speed and vehicle overload ratio, based on the premise of single vehicle load.
【學(xué)位授予單位】：青島理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U416.1

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