【摘要】：水泥混凝土路面具有剛度大、擴散荷載能力強；強度高、疲勞壽命長；平整度衰減慢、能維持較長時間的高平整度等優(yōu)點，是高等級路面結(jié)構(gòu)的主要形式之一，近些年來被廣泛應(yīng)用，特別是低等級公路、工礦道路和機場跑道，水泥混凝土路面的應(yīng)用更加普遍，截止到2012年底，我國水泥混凝土路面公路里程約占公路總里程的39%。但水泥混凝土路面面層板邊緣的過早破壞、面層開裂、橫縫錯臺等病害一直困擾著道路工程界。研究中發(fā)現(xiàn)：水泥混凝土的熱膨脹系數(shù)對于水泥混凝土路面結(jié)構(gòu)設(shè)計有一定的影響。但是目前大多數(shù)研究主要是分析熱膨脹系數(shù)值的影響因素，對熱膨脹系數(shù)如何影響水泥混凝土路面結(jié)構(gòu)設(shè)計的研究很少。筆者主要針對熱膨脹系數(shù)對水泥混凝土路面結(jié)構(gòu)設(shè)計的影響進行了分析探討。 為了研究熱膨脹系數(shù)對水泥混凝土路面結(jié)構(gòu)設(shè)計的影響，根據(jù)我國水泥混凝土路面設(shè)計標(biāo)準(zhǔn)方法和美國力學(xué)經(jīng)驗設(shè)計法，分別采用相應(yīng)的路面設(shè)計軟件計算了熱膨脹系數(shù)對水泥混凝土面層板厚度設(shè)計的影響，，分析其原因，由于設(shè)計標(biāo)準(zhǔn)不同，熱膨脹系數(shù)對路面厚度設(shè)計的影響存在顯著差異。我國水泥混凝土路面設(shè)計中，熱膨脹系數(shù)只直接影響溫度應(yīng)力，而美國力學(xué)經(jīng)驗設(shè)計法，更多地考慮了熱膨脹系數(shù)對接縫傳荷能力以及板角翹曲變形的影響。據(jù)此，根據(jù)我國規(guī)范以及有限元軟件數(shù)值模擬分析了熱膨脹系數(shù)對面層板溫度應(yīng)力的影響，同時采用美國力學(xué)經(jīng)驗設(shè)計法分析了熱膨脹系數(shù)對水泥混凝土路面橫向開裂率以及橫縫錯臺量的影響。并提出了接縫傳荷能力預(yù)測模型以及水泥混凝土路面疲勞應(yīng)力計算新思路。 結(jié)果表明：（1）熱膨脹系數(shù)對水泥混凝土面層板溫度疲勞應(yīng)力的影響很大，熱膨脹系數(shù)每增加1×10-6/℃時，溫度疲勞應(yīng)力都會增加10%以上，甚至達到59%。（2）熱膨脹系數(shù)對水泥混凝土面層板橫縫錯臺量以及橫向開裂率的影響都非常大，熱膨脹系數(shù)每增加1×10-6/℃，橫縫錯臺量增加65%，橫向開裂率可以增加400%。（3）熱膨脹系數(shù)對接縫傳荷能力以及板角翹曲變形的影響會直接改變水泥混凝土路面設(shè)計厚度。 因此，在我國水泥混凝土路面設(shè)計中要充分考慮熱膨脹系數(shù)對溫度疲勞應(yīng)力、接縫傳荷能力以及板角溫度翹曲變形的影響，優(yōu)化接縫傳荷能力預(yù)測模型，改進溫度疲勞應(yīng)力計算方法，并建立適合我國狀況的公路水泥混凝土熱膨脹系數(shù)值試驗規(guī)程，這可以有效減少水泥混凝土路面病害，為水泥混凝土路面的進一步優(yōu)化提供參考。
[Abstract]:Cement concrete pavement has the advantages of high stiffness, strong diffusive load capacity, high strength, long fatigue life, low flatness attenuation, and can maintain high smoothness for a long time, so it is one of the main forms of high grade pavement structure. In recent years, it has been widely used, especially in low-grade highway, industrial road, airport runway and cement concrete pavement. Up to the end of 2012, the mileage of cement concrete pavement in China accounts for 39% of the total road mileage. However, the premature destruction of the edge of the cement concrete pavement surface slab, the cracking of the surface layer, the cross joint staggered platform and other diseases have been puzzling the road engineering field. It is found that the coefficient of thermal expansion of cement concrete has a certain influence on the structural design of cement concrete pavement. But at present, most of the research is mainly to analyze the influence factors of the coefficient of thermal expansion, and there is little research on how the coefficient of thermal expansion affects the design of cement concrete pavement structure. The influence of thermal expansion coefficient on the design of cement concrete pavement structure is analyzed and discussed in this paper. In order to study the influence of thermal expansion coefficient on the structural design of cement concrete pavement, according to the standard design method of cement concrete pavement in China and the design method of American mechanics experience, The influence of thermal expansion coefficient on the thickness design of cement concrete surface slab is calculated by using the corresponding pavement design software, and the reasons are analyzed. Because of different design standards, the influence of thermal expansion coefficient on pavement thickness design is obviously different. In the design of cement concrete pavement in China, the thermal expansion coefficient only directly affects the temperature stress, while the influence of the coefficient of thermal expansion coefficient on the load transfer capacity of the butt joint and the warping deformation of the plate angle is more considered in the empirical design method of American mechanics. According to the code of our country and the numerical simulation of finite element software, the influence of thermal expansion coefficient on the thermal stress of the opposite laminate is analyzed. At the same time, the influence of thermal expansion coefficient on the transverse cracking rate of cement concrete pavement and the number of transverse joints are analyzed by means of the empirical design method of American mechanics. A prediction model of joint load transfer capacity and a new method for calculating fatigue stress of cement concrete pavement are put forward. The results show that: (1) the thermal expansion coefficient has a great effect on the thermal fatigue stress of cement concrete surface slab. When the thermal expansion coefficient increases by 1 脳 10 ~ (-6) / 鈩

本文編號：2161677