【摘要】：我國高速公路的發(fā)展日新月異,高速、大流量和渠化交通的聯(lián)合作用很大程度上削弱了高速公路瀝青路面的自愈合效用,導(dǎo)致道路早期損壞,再加上超限運(yùn)輸,使得公路路面的損害進(jìn)一步加重。在瀝青路面的破損形式中,疲勞損壞已成為瀝青路面破壞的主要形式之一。然而,由于輪胎自身結(jié)構(gòu)和材料的高度非線性以及輪胎充氣壓力、轉(zhuǎn)動(dòng)速度、軸載以及輪胎與路面的滾滑關(guān)系等因素的影響,輪胎與路面接觸應(yīng)力的大小和分布十分復(fù)雜,路面的拉應(yīng)力和拉應(yīng)變受上述因素的影響,從而影響到路面的磨損、變形和疲勞壽命。因此,必須建立車輪-路基-路面三維耦合模型來研究瀝青路面疲勞壽命的影響因素。主要工作內(nèi)容如下：1)利用粉土的試驗(yàn)數(shù)據(jù)對路基土的典型應(yīng)力相關(guān)的動(dòng)態(tài)回彈模量預(yù)估模型進(jìn)行綜合評估,并提出了改進(jìn)的四參數(shù)動(dòng)態(tài)回彈模量模型,通過編寫用戶自定義材料子程序,將改進(jìn)模型移植到ABAQUS中,實(shí)現(xiàn)了對瀝青路面-路基結(jié)構(gòu)變形的模擬。2)建立了輪胎-路基-路面結(jié)構(gòu)的三維有限元模型,考慮了輪胎的穩(wěn)態(tài)滾動(dòng)和路基土的回彈模量的應(yīng)力相關(guān)性,對比了不同形式的簡化輪載與直接輪載作用對路基路面結(jié)構(gòu)的靜態(tài)計(jì)算結(jié)果的影響,討論了荷載形式對計(jì)算路面與輪胎接觸部位的應(yīng)力-應(yīng)變響應(yīng)的影響。3)利用穩(wěn)態(tài)輸運(yùn)分析方法計(jì)算了車輪不同滾動(dòng)狀態(tài)時(shí)路面的穩(wěn)態(tài)響應(yīng),獲得了輪胎初始自由滾動(dòng)狀態(tài)時(shí)摩擦系數(shù)、軸重、胎壓和速度對路面應(yīng)力-應(yīng)變的影響規(guī)律。4)結(jié)合瀝青混合料的疲勞壽命預(yù)估方程,揭示了瀝青路面疲勞開裂機(jī)理,并基于拉應(yīng)變疲勞預(yù)估模型,討論了輪軸阻力、摩擦系數(shù)、軸重和胎壓等因素對疲勞壽命的影響。
[Abstract]:With the rapid development of expressway in China, the combination of high speed, large volume of traffic and channelized traffic greatly weakens the self-healing effect of highway asphalt pavement, resulting in the early damage of the road, plus the over-limited transportation. The damage to the road surface is further aggravated. In the form of asphalt pavement damage, fatigue damage has become one of the main forms of asphalt pavement damage. However, due to the high nonlinearity of tire structure and material and the influence of tire inflatable pressure, rotation speed, axle load and the relationship between tire and road surface, the size and distribution of contact stress between tire and pavement are very complex. The tensile stress and strain of pavement are affected by the above factors, thus affecting the wear, deformation and fatigue life of pavement. Therefore, it is necessary to establish a three-dimensional model of wheel-subgrade-pavement coupling to study the influencing factors of asphalt pavement fatigue life. The main contents of the work are as follows: 1) the dynamic elastic modulus prediction model related to typical stress of subgrade soil is comprehensively evaluated by using the test data of silt, and an improved four-parameter dynamic elastic modulus model is proposed. The improved model is transplanted into ABAQUS by writing the user-defined material subroutine. The simulation of asphalt pavement subgrade structure deformation is realized. 2) the three-dimensional finite element model of tire subgrade pavement structure is established. Considering the stress correlation between the steady rolling of tire and the modulus of resilience of subgrade soil, the effects of simplified wheel load and direct wheel load on the static calculation results of subgrade and pavement structure are compared. The influence of load form on the stress-strain response of the road surface in contact with the tire is discussed. 3) the steady state response of the road surface under different rolling states of the wheel is calculated by using the steady state transport analysis method. The effects of friction coefficient, axle load, tire pressure and velocity on the pavement stress and strain in the initial free rolling state are obtained. 4) the fatigue cracking mechanism of asphalt pavement is revealed by combining the fatigue life prediction equation of asphalt mixture. Based on the tensile strain fatigue prediction model, the effects of wheel shaft resistance, friction coefficient, axle load and tire pressure on fatigue life are discussed.
【學(xué)位授予單位】：西南交通大學(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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