發(fā)布時間：2018-04-30 03:08

  本文選題：城市道路 + 瀝青路面　； 參考：《中南大學(xué)》2014年碩士論文

【摘要】：隨著汽車數(shù)量的急劇增加,人們對城市道路系統(tǒng)量和質(zhì)的要求也不斷提高。作為城市道路瀝青路面主要的破損形式之一,瀝青路面車轍問題越來越受到人們的關(guān)注�，F(xiàn)有城市瀝青路面車轍的研究大多是基于恒定溫度條件進行的,忽略了周期變化的氣候和交通條件對瀝青路面車轍產(chǎn)生、發(fā)展的影響。 本文首先以長沙市部分城市主干道為背景,現(xiàn)場調(diào)查了部分主干道的路面交通和車轍狀況,結(jié)合對車轍類型和形成機理的分析,探討城市瀝青路面車轍成因、特點及影響因素。 其次,采用ABAQUS建立了瀝青路面結(jié)構(gòu)三維有限元模型,以長沙多年的月平均氣象數(shù)據(jù)為邊界條件,利用DFLUX和FILM子程序?qū)崿F(xiàn)對瀝青路面溫度場的日變化分析。計算結(jié)果顯示：溫度的不斷變化,引起瀝青路面結(jié)構(gòu)沿路面厚度方向產(chǎn)生較大的溫度梯度,使路面各結(jié)構(gòu)層的溫度分布存在不均勻性和不穩(wěn)定性。 最后,編寫DLOAD和UTRACLOAD子程序施加移動荷載,對溫度場條件下不同荷載組合的路面力學(xué)響應(yīng)進行了對比分析,并探討了不同溫度場、車速、水平荷載和接地壓力對力學(xué)響應(yīng)的影響。結(jié)合溫度場條件下的累計荷載作用下車轍日變化規(guī)律及影響因素分析,得出交叉口瀝青路面車轍產(chǎn)生的力學(xué)機理。結(jié)果表明：水平荷載作用下,瀝青面層表面顯著增大的水平剪應(yīng)力是導(dǎo)致交叉口路面車轍的主要原因。車轍發(fā)展是具有溫度區(qū)間效應(yīng)的,氣溫超過25℃后瀝青混合料的抗剪強度和模量會隨溫度升高而急劇下降,從而導(dǎo)致車轍的顯著發(fā)展。水平剪應(yīng)力和車轍量均隨著車速的減小和水平荷載系數(shù)、接地壓力的增大而遞增。
[Abstract]:With the rapid increase in the number of cars, the demand for the quantity and quality of urban road system is also increasing. As one of the main damaged forms of urban asphalt pavement, people pay more and more attention to rutting of asphalt pavement. Most of the existing researches on the rutting of urban asphalt pavement are based on constant temperature conditions, ignoring the influence of periodic climate and traffic conditions on the rutting and development of asphalt pavement. Based on the background of some urban main roads in Changsha, this paper investigates the traffic and rutting situation of some main roads on the spot, analyzes the rutting types and formation mechanism, and probes into the causes, characteristics and influencing factors of rutting in urban asphalt pavement. Secondly, the three-dimensional finite element model of asphalt pavement structure is established by using ABAQUS. Based on the monthly average meteorological data of Changsha for many years, the daily variation of temperature field of asphalt pavement is analyzed by using DFLUX and FILM subroutine. The calculation results show that the continuous change of temperature leads to a large temperature gradient along the road surface thickness direction of asphalt pavement structure and makes the temperature distribution of each structure layer of the pavement uneven and unstable. Finally, DLOAD and UTRACLOAD subroutines are compiled to apply moving load to analyze the mechanical response of pavement under different load combinations under temperature field, and the effects of different temperature field, speed, horizontal load and grounding pressure on the mechanical response are discussed. Based on the analysis of the rut diurnal variation and its influencing factors under the accumulative load under the condition of temperature field, the mechanical mechanism of rutting of asphalt pavement at intersection is obtained. The results show that the obvious increase of horizontal shear stress on the surface of asphalt surface is the main reason for rutting of intersection pavement under horizontal load. Rutting development has the effect of temperature range. When the temperature exceeds 25 鈩，

本文編號：1822792