本文選題：Top-Down裂縫 + 溫度場��； 參考：《長安大學(xué)》2014年碩士論文

【摘要】：瀝青路面的Top-Down裂縫是瀝青路面初期損壞的一種，，對瀝青路面的使用性能和使用期限有較大的影響，目前國內(nèi)外對Top-Down裂縫的研究一般局限于有限元分析，未見乏解析法分析。因此，運用解析法分析瀝青路面的開裂機理，從而得到瀝青路面Top-Down裂縫開裂應(yīng)力分析的計算程序很有必要。 本文參考大量國內(nèi)外相關(guān)文獻和研究成果，建立適用于解析法分析瀝青路面Top-Down開裂的輪胎接地模型。采用AI法得到路面結(jié)構(gòu)溫度場，同時考慮使用年限、不同溫度、深度和空隙率的影響，根據(jù)瀝青老化預(yù)估模型得出春季、夏季、冬季工況下未老化和老化后的動態(tài)模量。以彈性層狀理論體系為基礎(chǔ)，運用解析法建立力學(xué)計算模型計算車輛荷載作用下瀝青路面結(jié)構(gòu)的應(yīng)力和老化后突然降溫工況下瀝青路面的溫度應(yīng)力，并且運用MATLAB軟件編制解析法計算程序。在計算分析的基礎(chǔ)上提出瀝青路面Top-Down開裂應(yīng)力分析方法。將解析法計算結(jié)果與有限元計算結(jié)果、試驗路實測結(jié)果進行了對比，結(jié)果分別相差20%、30%左右。計算誤差在合理范圍內(nèi)，證明了解析法的可行性。通過解析法編制的計算程序計算老化前春季、夏季、冬季工況，老化后春季、夏季、冬季工況，及老化后突然降溫后春季、夏季、冬季工況下的應(yīng)力。 根據(jù)解析法分析結(jié)果來確定瀝青路面Top-Down裂縫的開裂原理：瀝青路面不考慮老化時，輪胎荷載作用下的最大剪應(yīng)力是造成路面Top-Down裂縫開裂的主要原因；老化后，輪胎荷載作用下的最大拉應(yīng)力是造成瀝青路面Top-Down裂縫開裂的主要原因；老化后并突然降溫后，輪胎荷載的最大拉應(yīng)力大于了材料的抗拉強度而導(dǎo)致了瀝青路面開裂。
[Abstract]:The Top-Down crack of asphalt pavement is a kind of initial damage of asphalt pavement, which has great influence on the performance and service life of asphalt pavement. At present, the research on Top-Down crack is generally limited to finite element analysis, but no analytical analysis has been found. Therefore, it is necessary to use the analytical method to analyze the cracking mechanism of asphalt pavement and to obtain the Top-Down crack stress analysis program of asphalt pavement. In this paper, referring to a large number of domestic and foreign literatures and research results, a tire grounding model suitable for analytical analysis of asphalt pavement Top-Down cracking is established. The temperature field of pavement structure is obtained by AI method, and considering the influence of service life, different temperature, depth and void ratio, the dynamic modulus of unaged and aged pavement under spring, summer and winter conditions is obtained according to the asphalt aging prediction model. Based on the elastic layered theory system, the mechanical calculation model is established to calculate the stress of asphalt pavement structure under vehicle load and the temperature stress of asphalt pavement under the condition of sudden cooling after aging. And use MATLAB software to compile analytic method calculation program. On the basis of calculation and analysis, the Top-Down cracking stress analysis method of asphalt pavement is put forward. The calculated results of the analytical method are compared with the results of the finite element method, and the measured results of the experimental road are compared. The difference between the results is about 20% or 30% respectively. The calculation error is within a reasonable range, which proves the feasibility of the analytical method. The stress in spring, summer, winter, spring, summer, winter after aging, and the stress in spring, summer and winter after sudden cooling after aging are calculated by the calculation program compiled by analytical method. According to the analytical results, the cracking principle of asphalt pavement Top-Down crack is determined. When asphalt pavement does not consider aging, the maximum shear stress under tire load is the main cause of pavement Top-Down crack cracking. The maximum tensile stress under tire load is the main cause of Top-Down cracking in asphalt pavement. After aging and suddenly cooling down, the maximum tensile stress of tire load is greater than the tensile strength of the material, which leads to the cracking of asphalt pavement.
【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】：2014
【分類號】：U416.217;U418.6

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本文編號：1876367