本文關(guān)鍵詞：拓寬路基差異沉降下路面結(jié)構(gòu)受力變形特性及機(jī)理研究　出處：《長(zhǎng)安大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 公路拓寬 差異沉降 路面結(jié)構(gòu) 數(shù)值模擬 應(yīng)力分析

【摘要】：高速公路拓寬工程中必然面臨地基差異沉降問題,如地基的差異沉降控制不當(dāng),路面結(jié)構(gòu)將會(huì)受到破壞。目前我國(guó)在地基差異沉降對(duì)路面結(jié)構(gòu)的力學(xué)特性影響方面的研究尚顯不足,開展地基差異沉降對(duì)路面結(jié)構(gòu)的力學(xué)特性及破壞機(jī)理研究,對(duì)指導(dǎo)高速公路拓寬工程、路面結(jié)構(gòu)設(shè)計(jì)、預(yù)防路面結(jié)構(gòu)破壞及提高路面的使用壽命具有重大的意義。本文依托“國(guó)家自然科學(xué)基金”項(xiàng)目《大比尺路基拓寬差異沉降模型試驗(yàn)》,以有限元數(shù)值模擬為手段,進(jìn)行地基差異沉降對(duì)路面結(jié)構(gòu)的力學(xué)特性及破壞機(jī)理較深入的研究,本文主要研究?jī)?nèi)容如下:1.本研究基于大比尺路基拓寬物理模型試驗(yàn),對(duì)試驗(yàn)資料進(jìn)行重新整理,利用有限元分析軟件建立二維數(shù)值模型求出路基拓寬地基差異沉降曲線,驗(yàn)證物理模型試驗(yàn)沉降曲線設(shè)計(jì)的合理性;針對(duì)物理模型研究性地建立多個(gè)三維數(shù)值模型,探討并確定最合理的物理模型的仿真數(shù)值模型,提出了數(shù)值模擬關(guān)鍵技術(shù)。2.對(duì)比分析物理模型的三維數(shù)值仿真的計(jì)算結(jié)果與物理模型試驗(yàn)結(jié)果,得出了一致的發(fā)展規(guī)律;通過有限元數(shù)值計(jì)算補(bǔ)充了物理模型試驗(yàn)的內(nèi)容,對(duì)在地基差異沉降下路面結(jié)構(gòu)的各個(gè)結(jié)構(gòu)層的縱向應(yīng)力、剪應(yīng)力及對(duì)路面結(jié)構(gòu)層的破壞機(jī)理進(jìn)行分析。3.通過收集資料分析河南省重交通特性,引用國(guó)內(nèi)外得軸載作用下的輪壓力學(xué)模型,確定車輛荷載圖式和車輛荷載橫向分布方案;以有限元分析軟件為工具,基于拓寬路基差異沉降三維數(shù)值模型,進(jìn)行重交通荷載模擬計(jì)算;通過分析差異沉降條件下重交通荷載瀝青混凝土和水泥混凝土的數(shù)值模擬計(jì)算結(jié)果,研究路面結(jié)構(gòu)的力學(xué)響應(yīng)規(guī)律和破壞機(jī)理。
[Abstract]:In the expressway widening project, the differential settlement of the foundation must be faced with, such as the improper control of the differential settlement of the foundation. The pavement structure will be destroyed. At present, the research on the influence of the ground differential settlement on the mechanical properties of the pavement structure is still insufficient, and the research on the mechanical characteristics and failure mechanism of the ground differential settlement on the pavement structure is carried out. To guide the highway widening project, pavement structure design. It is of great significance to prevent the damage of pavement structure and improve the service life of pavement. This paper relies on the project of National Natural Science Foundation "Model Test of widening differential settlement of roadbed with large scale". By means of finite element numerical simulation, the mechanical characteristics and failure mechanism of pavement structure caused by foundation differential settlement are studied deeply. The main contents of this paper are as follows: 1. Based on the physical model test of roadbed widening with large scale, the experimental data are rearranged. Using finite element analysis software to establish a two-dimensional numerical model to find out the subgrade widening foundation differential settlement curve to verify the rationality of the physical model test settlement curve design; Aiming at the physical model, several 3D numerical models are established, and the most reasonable simulation numerical model of physical model is discussed and determined. The key technology of numerical simulation is put forward. 2. The calculation results of three-dimensional numerical simulation of physical model are compared with the results of physical model test, and the development law is obtained. The content of physical model test is supplemented by finite element numerical calculation, and the longitudinal stress of each layer of pavement structure under subgrade differential settlement is analyzed. The shear stress and failure mechanism of pavement structure layer are analyzed. 3. Through collecting data to analyze the heavy traffic characteristics of Henan Province, the wheel pressure model under the action of axle load at home and abroad is quoted. Determine the vehicle load schema and vehicle load transverse distribution scheme; Based on the three-dimensional numerical model of widening the differential settlement of roadbed, the simulation of heavy traffic load is carried out by using finite element analysis software. By analyzing the numerical simulation results of bituminous concrete and cement concrete under heavy traffic load under the condition of differential settlement, the mechanical response law and failure mechanism of pavement structure are studied.
【學(xué)位授予單位】：長(zhǎng)安大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U416

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