本文選題：分形 + 裂縫修補�。� 參考：《合肥工業(yè)大學》2017年碩士論文

【摘要】：路面開裂和路面拼接是道路工程中十分常見的含縫工作結(jié)構(gòu),本文的主要目的是在充分考慮含縫結(jié)構(gòu)材料之間的幾何接觸特性和界面粘結(jié)特性的情況下,分析其在車輛荷載下的動態(tài)力學響應(yīng)。路面開裂是水泥混凝土路面的一種常見病害,研究斷裂面的表面形狀和重構(gòu)有利于量化評價修補效果。通過自制斷面測量儀測得真實斷裂面的分形維數(shù)D和輪廓算數(shù)平均差G后,基于兩向異性的W-M法進行裂縫區(qū)域的空間幾何重構(gòu)。通過含縫柱狀試件的沖擊試驗,驗證了裂縫區(qū)域重構(gòu)方法的有效性。耦合重構(gòu)裂縫區(qū)域和車輛輪胎動載的水泥混凝土路面足尺仿真表明,采用非規(guī)則斷裂面時裂縫區(qū)域的受力狀態(tài)比采用規(guī)則斷裂面時的結(jié)果更不利。以水泥材料為例研究裂縫修補料的強度形成過程,本文提出一種參數(shù)識別迭代算法,可合理確定水化動力學參數(shù),其生成的水化速率曲線與試驗數(shù)據(jù)具有較好的吻合度。水泥水化數(shù)值仿真試驗可以預(yù)測絕熱情況下水泥混凝土的溫度變化,能替代絕熱溫升試驗獲取水化熱數(shù)據(jù)。依據(jù)BSE圖像中水化產(chǎn)物面積比獲得的水化程度指數(shù)函數(shù)可以較好地吻合試驗數(shù)據(jù),能替代傳統(tǒng)水化熱法進行水化動力學分析。結(jié)果表明本文的研究可提高水化動力學參數(shù)的識別精度,并為水化動力學分析提供新的研究手段。最后以水泥穩(wěn)定碎石為例,研究了其動態(tài)彈性模量隨水化程度及齡期的變化關(guān)系,為路面拼接中合理選擇基層養(yǎng)護齡期作準備。對于路面拼接,依據(jù)雙圓荷載下二維拼接模型計算得到的應(yīng)變能密度指標,分別得到了面層和基層的最佳拼接尺寸,并以此建立三維路面拼接模型。耦合車輛的輪胎模型后,分析車輛荷載下不同拼接縫上方瀝青混凝土層底和水泥穩(wěn)定碎石層底的應(yīng)變能密度,并分別研究了不同界面參數(shù)、水泥穩(wěn)定碎石參數(shù)和不同加鋪厚度的CA砂漿層對計算結(jié)果的影響。建立瀝青混凝土和水泥穩(wěn)定碎石的小梁彎曲試驗數(shù)值模型,分別得到了單次荷載作用下的總應(yīng)變密度和疲勞極限次數(shù)關(guān)系的數(shù)學模型。基于三維拼接模型的應(yīng)變能密度計算結(jié)果,預(yù)估得到了車輛荷載下瀝青混凝土層和水泥穩(wěn)定碎石層的疲勞極限次數(shù)。
[Abstract]:Pavement cracking and pavement splicing are very common jointed working structures in road engineering. The main purpose of this paper is to fully consider the geometric contact characteristics and interface bonding characteristics of jointed structure materials. The dynamic mechanical response under vehicle load is analyzed. Pavement cracking is a common disease of cement concrete pavement. After the fractal dimension D and the average difference of the contour number G of the real fracture surface were measured by the self-made cross-section measuring instrument, the spatial geometric reconstruction of the fracture area was carried out based on the W-M method of two diameters. The effectiveness of the method is verified by impact tests of cylindrical specimens with cracks. The full-scale simulation of cement concrete pavement with coupled reconstruction of crack area and vehicle tire dynamic load shows that the stress state of crack area with irregular fracture surface is more disadvantageous than that with regular fracture surface. Taking cement material as an example to study the strength forming process of crack repairing material, an iterative algorithm for parameter identification is proposed in this paper, which can reasonably determine the hydration kinetic parameters. The hydration rate curve generated by the method is in good agreement with the experimental data. The numerical simulation test of cement hydration can predict the temperature change of cement concrete under adiabatic condition and can replace the adiabatic temperature rise test to obtain the hydration heat data. According to the area ratio of hydration product in BSE image, the hydration degree index function can fit the test data well, and can replace the traditional hydration heat method to analyze the hydration kinetics. The results show that the research in this paper can improve the identification accuracy of hydration kinetic parameters and provide a new research method for hydration kinetics analysis. Finally, taking cement stabilized macadam as an example, the relationship between dynamic modulus of elasticity and hydration degree and age is studied, so as to prepare for the reasonable selection of curing age of base course in pavement splicing. For pavement splicing, according to the strain energy density index calculated by two-dimensional splicing model under double circular load, the optimum stitching dimensions of surface layer and base course are obtained, respectively, and the 3D pavement splicing model is established. After coupling the tire model of the vehicle, the strain energy density of asphalt concrete bottom and cement stabilized gravel layer bottom above different jointed joints under vehicle load is analyzed, and the different interface parameters are studied respectively. The effect of cement stabilized macadam parameters and CA mortar with different overlay thickness on the calculation results. The numerical model of trabecular bending test of asphalt concrete and cement stabilized macadam is established, and the mathematical models of the relationship between the total strain density and the fatigue limit times under single load are obtained respectively. Based on the calculation results of strain energy density of 3D splicing model, the fatigue limit times of asphalt concrete layer and cement stabilized macadam layer under vehicle load are estimated.
【學位授予單位】：合肥工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：U418.6

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本文編號：1987259