本文選題：半剛性瀝青路面 + 極限軸載��； 參考：《湖南大學(xué)》2015年碩士論文

【摘要】：目前,公路交通運(yùn)輸超載日益嚴(yán)重,瀝青路面早期破壞現(xiàn)象越來越普遍,半剛性瀝青路面在某個(gè)極限的軸載作用下一次就可以達(dá)到破壞。車輛荷載是影響路面使用壽命的關(guān)鍵因素之一,我國現(xiàn)行規(guī)范中采用單軸雙輪組100k N作為標(biāo)準(zhǔn)軸載,然而調(diào)查顯示,某些公路上超載車輛單軸軸重超過300k N,雙軸總重在600k N以上,而無法控制過大軸載的一次作用對路面結(jié)構(gòu)造成的破壞極限狀態(tài)。極限軸載與路面結(jié)構(gòu)、車輛軸數(shù)與輪組(即軸型)及土基模量有關(guān),本文采用有限元方法,針對超載對路面產(chǎn)生的的一次破壞作用,系統(tǒng)和深入地研究了車輛軸數(shù)與輪組(即軸型)及土基模量對路面結(jié)構(gòu)極限軸載的影響。路面結(jié)構(gòu)層各層底彎拉應(yīng)力隨著軸載的增大而增大,達(dá)到某個(gè)值時(shí),某結(jié)構(gòu)層層底的最大彎拉應(yīng)力達(dá)到該結(jié)構(gòu)層材料的抗拉強(qiáng)度,使得該結(jié)構(gòu)層發(fā)生破壞,進(jìn)而整個(gè)結(jié)構(gòu)發(fā)生破壞,本文定義這個(gè)值為極限軸載。研究結(jié)果表明:軸數(shù)與輪組是影響半剛性瀝青路面結(jié)構(gòu)極限軸載的重要因素,增加車輛的軸數(shù)或者輪組可以減輕重型車對路面的損害,保證路面結(jié)構(gòu)的使用壽命;軸型系數(shù)反映了軸數(shù)與輪組對極限軸載的綜合影響,極限軸載與軸型系數(shù)呈正比關(guān)系;輪組相同時(shí),軸型系數(shù)增長的速率隨軸數(shù)的增加而降低,由單軸增加到雙軸、三軸及四軸時(shí),軸型系數(shù)增長速率為50%~27%~18%;軸數(shù)相同時(shí),軸型系數(shù)增長的速率隨輪組的增加而增加,由單輪組增加到雙輪組、四輪組時(shí),軸型系數(shù)的增長速率為7.3%~13.5%。此外,車輛的軸數(shù)與輪組對土基回彈模量與路面極限軸載的關(guān)系有一定影響。不同輪軸型作用下,土基模量是影響瀝青路面極限軸載的一個(gè)原因,增加土基回彈模量可以改善路面結(jié)構(gòu)的受力狀態(tài),路面極限軸載隨土基回彈模量的增加而近似線性地增加,對于單軸雙輪組的標(biāo)準(zhǔn)軸型,土基回彈模量由20MPa增加到40MPa與60MPa時(shí),路面極限軸載分別增加約19%和29%。
[Abstract]:At present, the overload of highway transportation is becoming more and more serious, and the early failure phenomenon of asphalt pavement is becoming more and more common. The semi-rigid asphalt pavement can be destroyed once under the action of a certain limit axle load. Vehicle load is one of the key factors affecting pavement service life. In the current code of our country, 100kN of single axle and double wheel group is adopted as standard axle load. However, the investigation shows that, The single axle weight of overloaded vehicles on some highways is more than 300kN and the total weight of two axles is more than 600kN, but the failure limit state of pavement structure caused by the primary action of excessive axle load can not be controlled. The ultimate axle load is related to the pavement structure, the axle number of vehicle and the wheel group (shaft type) and the modulus of soil foundation. In this paper, the finite element method is used to deal with the primary failure of road surface caused by overload. The effects of vehicle axle number, wheel group (shaft type) and soil modulus on the ultimate axle load of pavement structure are systematically and deeply studied. The bending tensile stress of each layer of pavement increases with the increase of axial load. When a certain value is reached, the maximum bending tensile stress at the bottom of a certain structure layer reaches the tensile strength of the material of the structure layer, which causes the failure of the structure layer. Then the whole structure is destroyed, and this value is defined as the ultimate axial load in this paper. The results show that the axle number and wheel group are the important factors that affect the ultimate axle load of semi-rigid asphalt pavement structure. Increasing the axle number of vehicle or wheel group can reduce the damage of heavy vehicle to pavement and ensure the service life of pavement structure. The axial coefficient reflects the comprehensive influence of the number of shafts and the wheel group on the ultimate axle load, and the ultimate axle load is proportional to the axial type coefficient, and when the wheel group is the same, the growth rate of the axial coefficient decreases with the increase of the number of shafts, and increases from uniaxial to biaxial. When the number of axes is the same, the increasing rate of axial coefficient increases with the increase of wheel group, from single wheel group to double wheel group, and from single wheel group to double wheel group, and from 4 wheel group to 7. 3% 13. 5% increase rate of axial coefficient. In addition, the axle number and wheel group of vehicle have some influence on the relationship between the modulus of resilience of soil foundation and the ultimate axle load of road surface. Under the action of different axle types, the modulus of soil foundation is one of the reasons that affect the ultimate axial load of asphalt pavement. Increasing the modulus of resilience of soil foundation can improve the stress state of pavement structure, and the ultimate axial load of pavement increases approximately linearly with the increase of modulus of resilience of soil foundation. For the standard axle type of single axle and double wheel group, when the elastic modulus of soil foundation increases from 20 MPA to 40 MPA and 60 MPA, the ultimate axle load of pavement increases by about 19% and 29%, respectively.
【學(xué)位授予單位】：湖南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U416.217

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本文編號：2035851