【摘要】：半剛性基層瀝青路面是我國高速公路主要的路面結(jié)構(gòu)形式,雖然我國對半剛性基層瀝青路面做了較為深入的研究,但對半剛性基層的特點并未全面認(rèn)識,直接導(dǎo)致以半剛性基層瀝青路面為代表的高速公路的路面早期破壞問題凸顯,在這種研究背景下,本論文針對半剛性基層瀝青路面的病害問題展開研究。通過對津京冀高速公路沿線半剛性基層瀝青路面的病害進(jìn)行全面調(diào)查,依據(jù)現(xiàn)行相關(guān)規(guī)范,采用路面平整度、路面車轍檢測方法和路面結(jié)構(gòu)強度試驗等方法對高速公路水損壞狀態(tài)及原因進(jìn)行分析；進(jìn)而對半剛性基層瀝青路面水損害原因進(jìn)行了分析評價,結(jié)果顯示,水損壞芯樣的瀝青混合料標(biāo)準(zhǔn)密度偏低,瀝青路面的實際殘留空隙率較大,極易發(fā)生滲水現(xiàn)象,是造成瀝青路面水損害破壞的主要原因；瀝青層底部的彎拉應(yīng)變在荷載作用下首先發(fā)生彎拉開裂,并逐漸向上擴展,成為水破壞的根源：瀝青混合料及水穩(wěn)碎石混合料表面附著有較厚的泥層,在遇水后泥層軟化,使得膠結(jié)料與石料之間逐漸喪失粘結(jié)而發(fā)生松散,導(dǎo)致瀝青路面水破壞在形式上主要體現(xiàn)為坑槽、松散和唧漿；水損害從類型上分為自上而下的表面層水破壞和自下而上的整體結(jié)構(gòu)水破壞,是由于瀝青與集料粘附力遭到破壞而產(chǎn)生的破壞現(xiàn)象,它不僅會導(dǎo)致松路面表面損壞,還降低了路面耐久性而誘發(fā)其它病害,甚至?xí)杆賹?dǎo)致路面結(jié)構(gòu)的整體性破壞,危害性極大：最后研究了兩種典型半剛性瀝青路面結(jié)構(gòu)疲勞裂縫的形成機理,進(jìn)而根據(jù)典型瀝青路面設(shè)計計算圖式,揭示路面結(jié)構(gòu)力學(xué)響應(yīng)機制,結(jié)果顯示,層問滑動狀態(tài)下半剛性基層層底的拉應(yīng)力較層間連續(xù)狀態(tài)相同位置的拉應(yīng)力有明顯增大,表明厚度增加對于降低路面結(jié)構(gòu)內(nèi)部水平拉應(yīng)力具有明顯的效果。本論文研究提出了防止瀝青路面早期破壞預(yù)防措施,具有重要的現(xiàn)實意義,可為類似工程借鑒。
[Abstract]:Semi-rigid base asphalt pavement is the main pavement structure form of expressway in China. Although our country has done more in-depth research on semi-rigid base asphalt pavement, it has not fully understood the characteristics of semi-rigid base course. The early failure problem of expressway pavement represented by semi-rigid base asphalt pavement is highlighted directly. In this research background, this paper focuses on the disease of semi-rigid base asphalt pavement. Through the comprehensive investigation on the diseases of asphalt pavement with semi-rigid base along the Beijing-Hebei Expressway, according to the current relevant codes, the pavement smoothness is adopted. Pavement rutting detection method and pavement structural strength test are used to analyze the water damage status and causes of expressway. Furthermore, the causes of water damage of asphalt pavement with semi-rigid base are analyzed and evaluated. The results show that the standard density of asphalt mixture with water damage core is on the low side, the actual residual void ratio of asphalt pavement is large, and the phenomenon of water seepage is easy to occur. It is the main cause of water damage of asphalt pavement. The flexural strain at the bottom of the asphalt layer first cracks under load, and gradually extends upward, which is the root of water failure: the surface of asphalt mixture and water-stabilized macadam mixture has a thick mud layer attached to it, and the mud layer softens when it comes to water. As a result, the bond between binder and stone is loosened gradually, which leads to the water damage of asphalt pavement mainly reflected in pothole, looseness and slurry. Water damage is classified into top-down surface layer water damage and bottom-up overall structural water damage, which is caused by the failure of asphalt and aggregate adhesion force, which will not only lead to surface damage of loose pavement. It also reduces the durability of pavement and induces other diseases, and even leads to the destruction of pavement structure as a whole, which is extremely harmful. Finally, the formation mechanism of fatigue cracks of two typical semi-rigid asphalt pavement structures is studied. Furthermore, according to the design and calculation scheme of typical asphalt pavement, the mechanical response mechanism of pavement structure is revealed. The results show that the tensile stress of the base of semi-rigid base under the sliding state is obviously increased than that of the same position in the continuous state of the layers. It shows that the increase of thickness has obvious effect on reducing the horizontal tensile stress of pavement structure. In this paper, preventive measures to prevent early damage of asphalt pavement are put forward, which have important practical significance and can be used for reference in similar projects.
【學(xué)位授予單位】：長沙理工大學(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：2420572