本文選題：車輛動載荷 + 長大上坡路段�。� 參考：《長安大學(xué)》2014年博士論文

【摘要】：長大上坡路段瀝青路面在車輛載荷作用下易出現(xiàn)病害和損壞。隨著公路交通向中西部丘陵山區(qū)的迅猛發(fā)展，勢必出現(xiàn)較多的長大上坡段瀝青路面。同時重載車輛的超載、環(huán)境溫度和瀝青混凝土路面的設(shè)計方法、選材施工工藝等因素導(dǎo)致長大上坡瀝青路面的力學(xué)行為極為復(fù)雜。本文對重載車輛作用下的長大上坡瀝青路面的力學(xué)行為進(jìn)行研究。 基于汽車動力學(xué)原理，建立了上坡路段車輛對路面動作用力系列分析模型，以此模型和對長大上坡路段車輛參數(shù)、路面情況調(diào)查為基礎(chǔ)，建立了二軸貨車在長大上坡路段動作用力分析計算模型。選用代表車型，利用MATLAB軟件對上坡車輛的動作用力進(jìn)行了數(shù)值仿真。分析了道路坡度、坡長、車輛載重量和入坡速度對動作用力的影響。 采用有限元方法，對長大上坡瀝青路面分別建立了車輛載荷作用下的彈性有限元模型和粘彈性動載有限元模型。選取力學(xué)響應(yīng)指標(biāo)，對兩種模型分別分析計算了路面結(jié)構(gòu)的力學(xué)響應(yīng)的分布規(guī)律。分別通過彈性和粘彈性兩種模型，研究了道路坡度、環(huán)境溫度、車輛載重、路面厚度和路面模量對力學(xué)響應(yīng)指標(biāo)的影響規(guī)律。 研制了用于瀝青路面動態(tài)應(yīng)變檢測的三向應(yīng)變傳感器，在ABAQUS中建立傳感器與瀝青路面的相互作用的力學(xué)模型，分析了道路中埋入傳感器對路面應(yīng)變場的影響。制定了利用此傳感器進(jìn)行長大上坡路段動力學(xué)響應(yīng)的試驗方案，并進(jìn)行現(xiàn)場實測試驗。通過試驗數(shù)據(jù)的處理，得到了動力學(xué)響應(yīng)關(guān)于坡長和載重的變化規(guī)律。比較了試驗結(jié)果、相應(yīng)的彈性和粘彈性仿真結(jié)果的差異，驗證了動態(tài)粘彈性模型能更準(zhǔn)確的模擬實際道路的力學(xué)行為。 由于路面層間剪切應(yīng)力是引起半剛性瀝青路面破壞的主要原因之一，本文對長大上坡段瀝青路面結(jié)構(gòu)進(jìn)行了現(xiàn)場層間剪切強(qiáng)度試驗，研制了可以實現(xiàn)垂向加載的層間剪切強(qiáng)度測試儀，利用該儀器，通過室內(nèi)試驗對現(xiàn)場測試得到的無垂向載荷的剪切強(qiáng)度結(jié)果進(jìn)行了修正，得到了不同超載率的層間剪切強(qiáng)度，，并對路面剪切強(qiáng)度的可靠度進(jìn)行了分析。利用流變學(xué)模型分析了不同工況下路面結(jié)構(gòu)的層間剪應(yīng)力，然后同相應(yīng)工況下路面結(jié)構(gòu)的剪切強(qiáng)度進(jìn)行對比分析，得到了不同可靠度下的長大上坡瀝青路面的層間抗剪性能。
[Abstract]:Asphalt pavement in long and high slope section is prone to damage and disease under vehicle load.With the rapid development of highway traffic to the hills and mountains of the central and western regions, there are bound to be more asphalt pavements in the long uphill section.At the same time, the overloading of heavy duty vehicles, the design method of environment temperature and asphalt concrete pavement, the construction technology of material selection and other factors lead to the extremely complex mechanical behavior of the asphalt pavement on the long slope.In this paper, the mechanical behavior of long uphill asphalt pavement under the action of heavy duty vehicle is studied.Based on the principle of automobile dynamics, a series of analysis model of vehicle action force on road surface in uphill section is established, which is based on the model and the investigation of vehicle parameters and road conditions in long uphill sections.A calculation model for the force analysis of two-axle freight cars on long uphill sections is established.The action force of uphill vehicle is simulated by MATLAB software.The effects of road slope, slope length, vehicle deadweight and descent speed on the action force are analyzed.The elastic finite element model and the viscoelastic dynamic finite element model of the long uphill asphalt pavement under vehicle load are established by using the finite element method.The distribution law of mechanical response of pavement structure is analyzed and calculated by selecting mechanical response index.The effects of road slope, ambient temperature, vehicle load, pavement thickness and pavement modulus on the mechanical response index were studied by means of elastic and viscoelastic models.A three-dimensional strain sensor for dynamic strain detection of asphalt pavement is developed. The mechanical model of the interaction between the sensor and asphalt pavement is established in ABAQUS. The influence of embedded sensors on the pavement strain field is analyzed.An experimental scheme for dynamic response of long up-slope section with this sensor is established, and the field test is carried out.By processing the experimental data, the variation of dynamic response on slope length and load is obtained.By comparing the experimental results and the difference between the corresponding elastic and viscoelastic simulation results, it is verified that the dynamic viscoelastic model can more accurately simulate the mechanical behavior of the actual road.Because the shear stress between the pavement layers is one of the main causes of the failure of the semi-rigid asphalt pavement, the field shear strength test of the asphalt pavement structure in the long and high slope section is carried out in this paper.An interlaminar shear strength tester which can realize vertical loading is developed. By using this instrument, the shear strength results without vertical load obtained by field tests are corrected, and the interlaminar shear strength with different overloading rates is obtained.The reliability of pavement shear strength is analyzed.The interlayer shear stress of pavement structure under different working conditions is analyzed by using rheological model, and then the shear strength of pavement structure under different working conditions is compared and analyzed, and the interlayer shearing performance of long uphill asphalt pavement with different reliability is obtained.
【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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