本文關(guān)鍵詞：基于動(dòng)態(tài)模量的瀝青混合料車轍預(yù)估模型研究　出處：《西安建筑科技大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 瀝青路面 車轍 動(dòng)態(tài)模量 動(dòng)態(tài)模量指標(biāo) 全厚式車轍試驗(yàn) 溫度梯度 預(yù)估模型 亞層疊加

【摘要】：在車輛荷載的長(zhǎng)期反復(fù)作用下，瀝青路面會(huì)出現(xiàn)不同程度的車轍病害，尤其在夏季高溫條件下，這種病害發(fā)展更快，嚴(yán)重影響了路面的使用壽命和服務(wù)質(zhì)量，還危及行車安全。長(zhǎng)期以來，道路科研工作者或者從瀝青混合料材料性能、瀝青路面結(jié)構(gòu)出發(fā)，或者從影響路面車轍的外部條件出發(fā)，分析瀝青路面車轍產(chǎn)生的機(jī)理，采用不同方法對(duì)瀝青面層的永久變形進(jìn)行了預(yù)估。有研究者指出瀝青混合料動(dòng)態(tài)模量及動(dòng)態(tài)模量指標(biāo)與其高溫性能密切相關(guān)，同時(shí)驗(yàn)證了動(dòng)態(tài)模量及動(dòng)態(tài)模量指標(biāo)與瀝青路面永久變形的相關(guān)性，試圖運(yùn)用這一動(dòng)態(tài)指標(biāo)對(duì)瀝青路面車轍問題進(jìn)行研究。 基于此，本文首先借助于旋轉(zhuǎn)壓實(shí)儀及簡(jiǎn)單性能試驗(yàn)機(jī)(SPT)，進(jìn)行了室內(nèi)瀝青混合料旋轉(zhuǎn)壓實(shí)試驗(yàn)和動(dòng)態(tài)模量試驗(yàn)，分析了試驗(yàn)溫度T，加載頻率f，加載應(yīng)力P，混合料的體積指標(biāo)（如孔隙率VV，有效瀝青用量Vbeff等）以及混合料級(jí)配等對(duì)混合料動(dòng)態(tài)模量和相位角的影響規(guī)律，根據(jù)時(shí)間—溫度置換原理,運(yùn)用非線性最小二乘法回歸擬合得到了不同溫度間的移位因子，建立了動(dòng)態(tài)模量主曲線，獲得了主曲線方程。之后根據(jù)Witczak動(dòng)態(tài)模量預(yù)估模型及Sigmoidal函數(shù)方程基本思想，通過考慮試驗(yàn)溫度、加載頻率、加載應(yīng)力、混合料體積指標(biāo)和級(jí)配特征，運(yùn)用麥夸特法優(yōu)化算法得到了瀝青混合料動(dòng)態(tài)模量預(yù)估模型，并對(duì)該預(yù)估模型進(jìn)行了驗(yàn)證。驗(yàn)證表明該預(yù)估模型具有較好的通用性。 動(dòng)態(tài)模量與動(dòng)態(tài)模量指標(biāo)能夠反映瀝青混合料在車輛荷載作用下的動(dòng)態(tài)特性，通過分析表明其與車轍變形量有較強(qiáng)的相關(guān)性。而后通過室內(nèi)標(biāo)準(zhǔn)車轍試驗(yàn)及改進(jìn)車轍儀的全厚式車轍試驗(yàn)得到了不同溫度，厚度，級(jí)配，加載條件下單層，雙層，全厚式車轍板試件的車轍變形規(guī)律。通過分析瀝青層厚度，荷載作用次數(shù)，動(dòng)態(tài)模量指標(biāo)，行車速度等車轍影響因素，結(jié)合有限元計(jì)算，采用亞層變形疊加的思想，提出了一種新的車轍預(yù)估模型。進(jìn)而用基因遺傳算法基本原理，編寫相應(yīng)程序，根據(jù)試驗(yàn)數(shù)據(jù)對(duì)預(yù)估模型的相關(guān)系數(shù)進(jìn)行了擬合。通過進(jìn)一步的試驗(yàn)，利用不同溫度，，不同荷載條件下的全厚式車轍試驗(yàn)數(shù)據(jù)驗(yàn)證了該模型，結(jié)果表明該模型能夠反映不同條件下瀝青面層的變形規(guī)律，也說明該預(yù)估模型具有較好的適用性，對(duì)實(shí)際瀝青路面車轍病害的防治有較好的指導(dǎo)意義。
[Abstract]:Under the long-term repeated action of vehicle load, asphalt pavement will appear different degrees of rutting disease, especially in the summer high temperature conditions, this disease development faster, seriously affected the pavement service life and quality of service. For a long time, road researchers have started from the performance of asphalt mixture materials, asphalt pavement structure, or from the external conditions that affect road rutting. The mechanism of rutting on asphalt pavement is analyzed and the permanent deformation of asphalt pavement is predicted by different methods. Some researchers point out that the dynamic modulus and dynamic modulus index of asphalt mixture is closely related to its high temperature performance. At the same time, the correlation between dynamic modulus and dynamic modulus index and permanent deformation of asphalt pavement is verified, and the rutting problem of asphalt pavement is studied by using this dynamic index. Based on this, the rotating compaction test and dynamic modulus test of indoor asphalt mixture are carried out with the help of rotary compaction instrument and simple performance tester SPT, and the test temperature T and loading frequency f are analyzed. The effect of loading stress, volume index of mixture (such as porosity VV, effective asphalt dosage Vbeff, etc.) and mixture gradation on dynamic modulus and phase angle of mixture. According to the principle of time-temperature replacement, the shift factor between different temperatures is obtained by nonlinear least square regression, and the main curve of dynamic modulus is established. The main curve equation is obtained. Then, according to the Witczak dynamic modulus prediction model and the basic idea of Sigmoidal function equation, the test temperature, loading frequency and loading stress are considered. Based on the volume index and gradation characteristics of asphalt mixture, the dynamic modulus prediction model of asphalt mixture is obtained by using the optimization algorithm of McQuat method. The prediction model is verified and verified, which shows that the prediction model has good generality. Dynamic modulus and dynamic modulus index can reflect the dynamic characteristics of asphalt mixture under vehicle load. The analysis shows that it has a strong correlation with the rut deformation, and then through the indoor standard rutting test and the improved rutting instrument of the full-thickness rutting test to obtain different temperatures, thickness, grading, loading conditions under the single layer. The rutting deformation law of double-layer and full-thickness rutting plate is analyzed by analyzing the influence factors of asphalt layer thickness, loading times, dynamic modulus index, driving speed and so on, combined with finite element calculation. Based on the idea of superposition of sublayer deformation, a new rut prediction model is proposed, and the corresponding program is compiled using the basic principle of genetic algorithm. According to the test data, the correlation coefficient of the prediction model is fitted. Through further experiments, the full-thickness rutting test data under different temperature and different load conditions are used to verify the model. The results show that the model can reflect the deformation law of asphalt surface under different conditions, and it also shows that the prediction model has good applicability, and has a better guiding significance for the prevention and treatment of rutting diseases on actual asphalt pavement.
【學(xué)位授予單位】：西安建筑科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U414

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