【摘要】：車轍是瀝青路面最嚴(yán)重的病害之一,車轍的產(chǎn)生降低了道路的服務(wù)水平,嚴(yán)重影響車輛的行車安全,為了更有針對性地防治車轍,提出了瀝青路面的車轍敏感區(qū)的概念。通過對車轍產(chǎn)生機理的分析發(fā)現(xiàn),車轍敏感區(qū)的存在與瀝青路面的較大應(yīng)力場(正應(yīng)力場和剪應(yīng)力場)和高溫溫度場有關(guān),利用二者的組合效應(yīng),對車轍敏感區(qū)進行分析。論文研究依托在建的高速公路,在路面結(jié)構(gòu)中埋設(shè)了壓力傳感器,實測了路面結(jié)構(gòu)內(nèi)的應(yīng)力,結(jié)合數(shù)據(jù)擬合結(jié)果,分析了瀝青路面的較大應(yīng)力場;利用現(xiàn)有的實測溫度數(shù)據(jù),分析了瀝青路面的高溫溫度場;利用有限元軟件對不同荷載水平、不同溫度下的路面應(yīng)力場進行了數(shù)值計算,分析了瀝青路面的剪應(yīng)力場;結(jié)合上述研究結(jié)果對車轍敏感區(qū)進行分析,并確定了車轍敏感區(qū)的深度范圍。研究結(jié)果表明:瀝青路面結(jié)構(gòu)內(nèi)的正應(yīng)力隨路面深度的增加呈指數(shù)形式衰減,滿足指數(shù)函數(shù)σ(h)=p_0 · e~(-h/b)的分布規(guī)律;基于實測路面應(yīng)力場,確定了較大應(yīng)力場的范圍,位于路表面以下36cm的范圍內(nèi);依據(jù)實測溫度確定了路面的高溫溫度場,主要分布在路面深度0～12cm之間l利用有限元軟件對路面應(yīng)力場進行數(shù)值計算,受最大剪應(yīng)力場影響較大的區(qū)域集中在5～10cm之間;對較大應(yīng)力場和高溫溫度場組合分析,得到高溫時路面結(jié)構(gòu)內(nèi)受壓應(yīng)力影響最大的區(qū)域,即路表面下0～8cm范圍內(nèi),之后結(jié)合對面層內(nèi)最大剪應(yīng)力的分析結(jié)果,對車轍敏感區(qū)進行分析,最終確定其深度范圍集中在0～10cm之間;提出三種防治車轍的技術(shù)方案,即進行交通管制(在特定的時間限制重載車輛通行);相應(yīng)提高車轍試驗的試驗溫度和荷載條件;復(fù)合抗車轍技術(shù)。
[Abstract]:Rut is one of the most serious diseases of asphalt pavement. The occurrence of rut reduces the service level of the road and seriously affects the driving safety of vehicles. In order to prevent and control rut more pertinently, the concept of rut sensitive area of asphalt pavement is put forward. Through the analysis of rut formation mechanism, it is found that the existence of rut sensitive zone is related to the larger stress field (positive stress field and shear stress field) and high temperature field of asphalt pavement. In this paper, based on the highway under construction, the pressure sensor is embedded in the pavement structure, the stress in the pavement structure is measured, combined with the data fitting results, the larger stress field of the asphalt pavement is analyzed. The high temperature field of asphalt pavement is analyzed by using the existing measured temperature data, and the stress field of asphalt pavement under different load levels and different temperatures is calculated by finite element software, and the shear stress field of asphalt pavement is analyzed. The rut sensitive area is analyzed and the depth range of the rut sensitive area is determined. The results show that the normal stress in asphalt pavement structure decays exponentially with the increase of pavement depth, which satisfies the distribution law of exponential function 蟽 (h) = p ~ (- h) ~ (- h ~ (- b). Based on the measured road surface stress field, the range of larger stress field is determined, which is within the range of 36cm below the road surface. According to the measured temperature, the high temperature field of the pavement is determined, which is mainly distributed between the pavement depth 0~12cm and the finite element software to calculate the pavement stress field. The area affected by the maximum shear stress field is concentrated between the 5~10cm. Based on the combined analysis of large stress field and high temperature field, the maximum shear stress in the face layer is obtained in the area where the compressive stress is most affected at high temperature, that is, in the range of 0~8cm under the road surface, and then the maximum shear stress in the facing layer is analyzed. The rut sensitive area was analyzed and the depth range was determined to be between 0~10cm. Three technical schemes of rut prevention are put forward, that is, traffic control (restricting the passage of heavy-duty vehicles at a specific time), increasing the test temperature and load conditions of rut test, and compound anti-rut technology.
【學(xué)位授予單位】：長安大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：U416.217

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