【摘要】：瀝青路面的反射裂縫,主要是由半剛性基層無法避免的溫縮及干縮裂縫導(dǎo)致應(yīng)力集中過大而引起的,車輛荷載、較大的環(huán)境溫差變化以及滲水導(dǎo)致反射裂縫道面破壞的不利因素。在半剛性基層和柔性面層之間設(shè)置防水抗裂功能層,可以有效緩解路面結(jié)構(gòu)的應(yīng)力集中現(xiàn)象,延緩反射裂縫的產(chǎn)生與擴(kuò)展速度。采用有限元方法模擬易發(fā)反射裂縫的實際環(huán)境,對設(shè)置及未設(shè)置防水抗裂功能層的路面結(jié)構(gòu)進(jìn)行溫度-荷載耦合力學(xué)對比分析,發(fā)現(xiàn)瀝青路面下面層的荷載應(yīng)力、溫度應(yīng)力以及應(yīng)力強(qiáng)度因子都有較大幅度的降低,并且計算了防水抗裂功能層厚度、模量對路面結(jié)構(gòu)應(yīng)力、彎沉和強(qiáng)度因子的影響。結(jié)果表明:一般防水抗裂功能層的模量越小,效果更加明顯;在合理范圍內(nèi)增加防水抗裂功能層的厚度能夠更加有效地預(yù)防反射裂縫病害;適當(dāng)控制基礎(chǔ)模量可以防止反射裂縫的產(chǎn)生。
[Abstract]:The reflective cracks of asphalt pavement are mainly caused by the excessive stress concentration caused by the temperature shrinkage and dry shrinkage cracks that cannot be avoided in the semi-rigid base. The larger environmental temperature difference and the unfavorable factors of water seepage leading to the failure of reflective crack surface. Setting waterproof and crack resistant functional layer between semi-rigid base and flexible surface layer can effectively alleviate the stress concentration phenomenon of pavement structure and delay the production and expansion speed of reflection crack. Finite element method is used to simulate the actual environment of prone reflective cracks. The temperature-load coupling mechanics analysis of pavement structure with and without waterproof and crack resistant functional layer is carried out, and the load stress of asphalt pavement underlayer is found. Both the temperature stress and the stress intensity factor are greatly reduced, and the effects of the thickness and modulus of the waterproof and crack resistant functional layer on the stress, deflection and strength factor of the pavement structure are calculated. The results show that the smaller the modulus of the general waterproof and crack resistant functional layer, the more obvious the effect is, and the more effective the thickness of the waterproof and crack resistant functional layer is, the more effective it is to prevent the reflective crack disease. The foundation modulus can be controlled properly to prevent the reflection crack.
【作者單位】： 同濟(jì)大學(xué)道路與交通工程教育部重點實驗室;
【分類號】：U416.217

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