發(fā)布時間：2019-01-03 18:56

【摘要】：瀝青路面半剛性基層疲勞預(yù)估模型一直沿用的單一疲勞指標(biāo)模式，不能適應(yīng)重載和氣候環(huán)境綜合作用下半剛性基層瀝青路面結(jié)構(gòu)性能評價的要求。半剛性基層瀝青路面急需突破長壽命路面結(jié)構(gòu)設(shè)計的技術(shù)瓶頸，主要是結(jié)構(gòu)性能評價中反映實(shí)際狀態(tài)的疲勞損傷模型及其支持參數(shù)。其建立方法和應(yīng)用是半剛性基層瀝青路面的共性關(guān)鍵技術(shù)。 本文通過理論與實(shí)驗(yàn)研究，改進(jìn)了半剛性材料室內(nèi)疲勞損傷測試方法，提出了用彎拉模量衰減率和彎拉強(qiáng)度比兩項(xiàng)指標(biāo)聯(lián)合表征的半剛性材料疲勞損傷模型，基于室內(nèi)ALF加速加載試驗(yàn)和現(xiàn)場實(shí)體工程觀測驗(yàn)證，得出了反映路面結(jié)構(gòu)實(shí)際損傷狀態(tài)的半剛性基層結(jié)構(gòu)疲勞損傷模型及其支撐參數(shù)。 針對現(xiàn)行半剛性材料疲勞試驗(yàn)結(jié)果離散性和變異性大的技術(shù)難題，通過對比試驗(yàn)分析，提出了用同層位梁試件彎拉強(qiáng)度確定疲勞荷載的疲勞損傷測試方法，提高了試驗(yàn)結(jié)果的可靠性；針對重復(fù)加載致梁體沿長度方向模量不均勻的問題，，提出了測量梁試件中段1/3區(qū)域撓度差的重復(fù)加載彎拉模量測試方法，實(shí)現(xiàn)半剛性材料不同疲勞損傷程度彎拉模量的測試；基于重復(fù)加載疲勞試驗(yàn)和連續(xù)損傷力學(xué)原理，首次建立了用彎拉模量衰減指標(biāo)和疲勞方程聯(lián)合表征的半剛性材料疲勞損傷模型；為解決支撐疲勞損傷模型力學(xué)響應(yīng)計算的結(jié)構(gòu)模量參數(shù)取值問題，通過對不同試驗(yàn)理論與方法測試比較，提出了基于試件中段應(yīng)變測量的半剛性材料單軸壓縮彈性模量簡單試驗(yàn)方法，提高了模量測試結(jié)果的可靠性，解決了現(xiàn)行試驗(yàn)方法模量參數(shù)與實(shí)際不符的技術(shù)難題；基于理論與現(xiàn)場檢測驗(yàn)證，提出了半剛性材料層設(shè)計期末疲勞損傷狀態(tài)下的有效模量確定方法，為結(jié)構(gòu)損傷全過程分析參數(shù)輸入提供依據(jù)；開發(fā)了適用于半剛性材料與結(jié)構(gòu)在現(xiàn)場環(huán)境作用下的響應(yīng)測試新技術(shù)，首次得到了半剛性基層結(jié)構(gòu)現(xiàn)場溫度變化引起的應(yīng)力應(yīng)變響應(yīng)特征；首次綜合重載ALF加速加載試驗(yàn)路與路面力學(xué)響應(yīng)傳感測試系統(tǒng)對半剛性基層疲勞損傷模型進(jìn)行觀測驗(yàn)證，明確了半剛性基層結(jié)構(gòu)損傷演變過程及不同階段的狀態(tài)，提出了疲勞開裂產(chǎn)生階段與裂縫擴(kuò)展階段時長的關(guān)系。
[Abstract]:The single fatigue index model of semi-rigid base asphalt pavement used all the time can not meet the requirements of structural performance evaluation of semi-rigid base asphalt pavement under the combined action of heavy load and climate environment. It is urgent for semi-rigid base asphalt pavement to break through the technical bottleneck of structural design of long-life pavement, which is mainly the fatigue damage model and its supporting parameters which reflect the actual state in structural performance evaluation. Its establishment method and application are the common key technology of semi-rigid base asphalt pavement. Based on the theoretical and experimental studies, this paper improves the indoor fatigue damage test method of semi-rigid materials, and presents a fatigue damage model of semi-rigid materials, which is characterized by the attenuation rate of flexural modulus and the ratio of flexural strength to tensile strength. Based on indoor ALF accelerated loading test and field engineering observation, the fatigue damage model of semi-rigid base structure and its supporting parameters are obtained to reflect the actual damage state of pavement structure. In view of the technical problems of discrete and high variability of fatigue test results of semi-rigid materials, a fatigue damage test method based on bending and tensile strength of specimens of the same layer beam is put forward through comparative test analysis. The reliability of the test results is improved. In order to solve the problem that the modulus of beam is not uniform in the direction of length caused by repeated loading, a method for measuring the deflection difference of 1 / 3 region in the middle section of beam specimen by repeated loading is put forward. The flexural modulus of semi-rigid material with different fatigue damage degree is tested. Based on the repeated loading fatigue test and the principle of continuous damage mechanics, the fatigue damage model of semi-rigid materials is first established, which is characterized by bending modulus attenuation index and fatigue equation. In order to solve the problem of determining the structural modulus parameters in the mechanical response calculation of the fatigue damage model of brace, the different test theories and methods are compared. A simple test method for uniaxial compression elastic modulus of semi-rigid materials based on mid-section strain measurement is proposed, which improves the reliability of the test results and solves the technical problem that the modulus parameters of the current test methods are not in accordance with the actual conditions. Based on the verification of theory and field test, a method for determining effective modulus of semi-rigid material layer under fatigue damage state at the end of design period is proposed, which provides the basis for the input of parameters in the whole process of structural damage analysis. A new response test technique for semi-rigid materials and structures under the action of field environment is developed, and the stress-strain response characteristics of semi-rigid base structure caused by field temperature change are obtained for the first time. For the first time, the fatigue damage model of semi-rigid base is observed and verified by the ALF accelerated loading test road and the pavement mechanical response sensing system, and the damage evolution process and the state of the semi-rigid base structure in different stages are clarified. The relationship between fatigue crack generation stage and crack propagation stage is put forward.
【學(xué)位授予單位】：長安大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2014
【分類號】：U416.217

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本文編號：2399756