本文關(guān)鍵詞：基于材料非線性的多軸重載下瀝青路面結(jié)構(gòu)響應(yīng)分析　出處：《東南大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 材料非線性 多軸重載 UMAT子程序 路面結(jié)構(gòu)響應(yīng)

【摘要】：為了滿足大物流的運(yùn)輸需求,解決運(yùn)輸經(jīng)濟(jì)與車(chē)輛超載的矛盾,車(chē)輛多軸重載運(yùn)輸已成為交通發(fā)展的必然趨勢(shì)。與此同時(shí),車(chē)輛的多軸重載作用對(duì)路面結(jié)構(gòu)與材料的要求也提出了新的挑戰(zhàn),尤其是在路基路面材料方面,在重載作用下路基路面材料呈現(xiàn)出較大的非線性特性。此外,隨著近些年來(lái)柔性路面的增多,工程實(shí)踐表明,在路面設(shè)計(jì)及研究中路面結(jié)構(gòu)材料的非線性特性不容忽視�；谏鲜鰻顩r,本文采用現(xiàn)場(chǎng)車(chē)輛調(diào)查與資料分析、路基路面材料特性研究和數(shù)值模擬等方法,分析了碎石底基層和土基非線性對(duì)路面結(jié)構(gòu)響應(yīng)的影響,同時(shí)在材料非線性的基礎(chǔ)上研究了多軸重載作用下路面結(jié)構(gòu)的響應(yīng)。本文對(duì)我國(guó)貨車(chē)發(fā)展及現(xiàn)狀進(jìn)行了調(diào)查分析。調(diào)研分析表明,我國(guó)重載貨車(chē)在過(guò)去十年實(shí)現(xiàn)了快速增長(zhǎng),在現(xiàn)行的城市快速路和省道中,多軸重載車(chē)輛可占到總貨車(chē)數(shù)量的一半,隨著大物流運(yùn)輸?shù)陌l(fā)展,多軸重載車(chē)將是我國(guó)未來(lái)貨車(chē)的發(fā)展趨勢(shì)。為了系統(tǒng)分析基于路基路而材料非線性多軸重載條件下路面結(jié)構(gòu)的響應(yīng),本文繼而展開(kāi)以下幾個(gè)方面的研究。首先,在路基路面材料方面著重考慮了碎石底基層和土基材料的非線性,并對(duì)其非線性應(yīng)力依賴模型進(jìn)行了系統(tǒng)研究。本文選取了國(guó)內(nèi)外常用的碎石應(yīng)力依賴模型,通過(guò)對(duì)已有碎石回彈模量測(cè)試數(shù)據(jù)的分析擬合,得到了三種不同級(jí)配碎石的本構(gòu)模型參數(shù)。對(duì)于土基材料,基于美國(guó)伊利諾伊州聯(lián)邦公路局對(duì)柔性路面的調(diào)查評(píng)估和我國(guó)實(shí)際情況,針對(duì)雙線性應(yīng)力依賴模型的土基的本構(gòu)關(guān)系,討論分析了由強(qiáng)到弱的四種不同土基材料,選取了不同土基的本構(gòu)模型參數(shù)。其次,在有限元原理的基礎(chǔ)上,分別針對(duì)碎石材料和土基材料的本構(gòu)模型,選取切線剛度算法編寫(xiě)了相應(yīng)的材料子程序,通過(guò)UMAT子程序接口導(dǎo)入到ABAQUS有限元軟件中,實(shí)現(xiàn)了非線性材料在ABAQUS有限元軟件中的數(shù)值分析計(jì)算。再次,建立了基于材料非線性的瀝青路面結(jié)構(gòu)響應(yīng)的有限元分析模型,以縱向應(yīng)力、路表豎向變形、基層層底拉應(yīng)力和路基表面垂直應(yīng)變作為路面結(jié)構(gòu)響應(yīng)指標(biāo),分別研究了碎石底基層非線性、土基非線性和雙層材料非線性對(duì)路面結(jié)構(gòu)響應(yīng)的影響。研究結(jié)果表明,相對(duì)材料線彈性特性,碎石底基層非線性在重載下強(qiáng)度增大,能夠加強(qiáng)路面結(jié)構(gòu)；在考慮雙層材料非線性時(shí),各路面結(jié)構(gòu)響應(yīng)指標(biāo)均為最不利情況,尤其是路基表面垂直應(yīng)變指標(biāo)。并且隨著載荷的增大,非線性條件下各路面結(jié)構(gòu)響應(yīng)指標(biāo)呈現(xiàn)非線性的增長(zhǎng),相對(duì)于線性條件明顯增加,表明重載對(duì)路面結(jié)構(gòu)響應(yīng)有較大的影響。最后,基于不同類型的碎石底基層和土基非線性,比較了單軸、雙軸和三軸載荷下路面的結(jié)構(gòu)響應(yīng)。結(jié)果表明,多軸情況下的路表豎向變形和路基表面垂直應(yīng)變均大于單軸情況,而層底拉應(yīng)力卻小于單軸條件下,說(shuō)明多軸載荷對(duì)路面的抗車(chē)轍性能影響較大,而對(duì)路面的抗疲勞性能影響較小。材料方面,上基強(qiáng)弱對(duì)各個(gè)指標(biāo)均有較大的影響,設(shè)計(jì)中宜采用回彈模量較高的強(qiáng)土基；碎石級(jí)配對(duì)路表豎向變形影響較小,對(duì)基層層底拉應(yīng)力和路基表面垂直應(yīng)變影響較大,設(shè)計(jì)中碎石底基層采用間斷級(jí)配較好,不宜采用連續(xù)級(jí)配。
[Abstract]:In order to meet the logistics transportation needs, solve the contradiction between transportation economy and overloading of vehicles, vehicle multi axle heavy haul transportation has become the inevitable trend of traffic development. At the same time, requirements of multi axis heavy load vehicles on the pavement structure and material also presents new challenges, especially in the subgrade and pavement materials, exhibit nonlinear characteristics the larger the material in the subgrade and pavement under heavy load. In addition, with the increase of flexible pavement in recent years, the engineering practice shows that the nonlinear characteristics of pavement design and research of road surface structure of materials can not be ignored. Based on the above situation, this paper adopts field survey and data analysis of vehicle, subgrade material properties of pavement research and numerical simulation methods. Analysis of gravel subbase and subgrade pavement structure of nonlinear response at the same time, based on the material nonlinear on the multi axis under heavy load The response of pavement structure. The investigation and Analysis on the development of freight cars in our country and current situation in this paper. Research and analysis shows that heavy trucks in China achieved rapid growth in the past ten years, in the current city expressway and highway, multi axis heavy vehicles can be accounted for half of the total number of trucks, along with the development of logistics transportation. Multi axle heavy truck will be the future development trend of truck in China. In order to analysis based on subgrade pavement structure and material nonlinear multi axis under heavy load response, we studied the following aspects. First of all, in the subgrade and pavement material nonlinear gravel subbase and subgrade materials were considered, and the the nonlinear stress dependence model was studied. This paper chooses the commonly used at home and abroad pavement stress dependent model, through the analysis of existing test data fitting gravel resilient modulus, obtained Three different graded gravel constitutive model parameters for subgrade materials, investigation on flexible pavement assessment of the US Federal Highway Administration Illinois and based on the actual situation in our country, according to the constitutive relation of bilinear stress dependent model of the soil, analyzed four different from strong to weak subgrade materials, selection the constitutive model parameters of different subgrade. Secondly, based on the finite element principle, respectively according to the constitutive model of gravel material and subgrade materials, selection of tangent stiffness method for the preparation of the corresponding material subroutine through the UMAT Interface subroutine into ABAQUS finite element software, the numerical analysis of nonlinear materials in ABAQUS the finite element software. Thirdly, established the finite element response of asphalt pavement structure material nonlinear analysis model based on the longitudinal stress, surface vertical deformation, base bottom tensile stress and The vertical strain response of pavement subgrade surface as the index, the gravel subbase of nonlinear, nonlinear and double nonlinear effect of subgrade material on pavement structure response. The results show that the relative material elastic properties, gravel subbase nonlinear under heavy load intensity increases, can strengthen the pavement structure; considering the double nonlinear material, the the pavement structure response index is the most unfavorable situation, especially the subgrade surface vertical strain index. And with the increase of the load, the response index shows a nonlinear growth of the pavement structure under nonlinear conditions, compared with the linear condition increased significantly, that heavy load has a great influence on pavement structure response. Finally, different types of gravel subbase and subgrade based on the nonlinear, compared the single axis response of pavement structure and three biaxial axial loads. The results show that the multi axle case The road surface and the vertical deformation of subgrade surface vertical strain were greater than the single axis, while the bottom layer tensile stress is less than the uniaxial conditions that influence multiaxial loading on anti rutting performance of pavement, and has little effect on fatigue performance of asphalt pavement. Based on the strength of materials, impact on every large in the design of appropriate indexes, strong rebound modulus of subgrade adopted high; gravel gradation of road surface vertical deformation has little effect on base, bottom layer tensile stress and vertical strain of subgrade surface has great influence, in the design of gravel subbase using discontinuous gradation is better, should not be used in continuous gradation.

【學(xué)位授予單位】：東南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U416.217

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