瀝青砂應力吸收層防治瀝青路面荷載型反射裂縫的研究
發(fā)布時間:2019-01-03 14:45
【摘要】:反射裂縫是半剛性基層瀝青路面產(chǎn)生開裂的主要原因之一,通過在瀝青面層與半剛性基層之間設置一層低模量改性瀝青混合料應力吸收層是一種可以有效緩解由半剛性基層裂縫而導致瀝青路面產(chǎn)生反射開裂的方法。本文通過室內(nèi)試驗進行了瀝青砂應力吸收層混合料的配合比設計,通過低溫抗裂試驗、高溫穩(wěn)定試驗和水穩(wěn)定性試驗等常規(guī)路用性能試驗驗證了所設計的應力吸收層配合比具備良好的路用性能。設計反射裂縫室內(nèi)模擬試驗,以瀝青面層開裂時的荷載作用次數(shù)為指標,分析設置應力吸收層后對結構受力的影響。通過改變應力吸收層厚度,建立抗裂比與應力吸收層厚度的關系,得出應力吸收層的合理厚度范圍。最終針對瀝青面層和應力吸收層厚度對瀝青面層開裂次數(shù)的影響進行線性回歸分析,建立室內(nèi)模擬試驗疲勞壽命模型。通過有限元軟件模擬分析了在行車荷載作用下道路各結構層的力學響應,以主要結構層的厚度和彈性模量為分析變量,根據(jù)各結構層的受力狀態(tài),提出各結構層的合理厚度和彈性模量。
[Abstract]:Reflection crack is one of the main causes of cracking in semi-rigid base asphalt pavement. By setting a layer of low modulus modified asphalt mixture stress absorption layer between the asphalt surface layer and the semi-rigid base course, it is a method that can effectively alleviate the reflection cracking of asphalt pavement caused by the crack of semi-rigid base course. In this paper, the mixture ratio of asphalt sand stress absorption layer mixture is designed through laboratory test, and the low temperature crack resistance test is carried out. The conventional road performance tests such as high temperature stability test and water stability test show that the designed mix ratio of the stress absorption layer has good road performance. An indoor simulation test of reflection crack was designed. The influence of stress absorption layer on the structure was analyzed by taking the number of loads acting on the asphalt surface as the index. By changing the thickness of the stress absorption layer, the relationship between the crack resistance ratio and the thickness of the stress absorption layer is established, and the reasonable thickness range of the stress absorption layer is obtained. Finally, according to the influence of asphalt surface and stress absorption layer thickness on the cracking times of asphalt surface layer, the fatigue life model of indoor simulation test was established by linear regression analysis. The mechanical response of each structure layer under the action of driving load is simulated by finite element software. The thickness and elastic modulus of the main structure layer are taken as the analysis variables, and according to the stress state of each structure layer, The reasonable thickness and elastic modulus of each structural layer are presented.
【學位授予單位】:東北林業(yè)大學
【學位級別】:碩士
【學位授予年份】:2015
【分類號】:U416.217
本文編號:2399523
[Abstract]:Reflection crack is one of the main causes of cracking in semi-rigid base asphalt pavement. By setting a layer of low modulus modified asphalt mixture stress absorption layer between the asphalt surface layer and the semi-rigid base course, it is a method that can effectively alleviate the reflection cracking of asphalt pavement caused by the crack of semi-rigid base course. In this paper, the mixture ratio of asphalt sand stress absorption layer mixture is designed through laboratory test, and the low temperature crack resistance test is carried out. The conventional road performance tests such as high temperature stability test and water stability test show that the designed mix ratio of the stress absorption layer has good road performance. An indoor simulation test of reflection crack was designed. The influence of stress absorption layer on the structure was analyzed by taking the number of loads acting on the asphalt surface as the index. By changing the thickness of the stress absorption layer, the relationship between the crack resistance ratio and the thickness of the stress absorption layer is established, and the reasonable thickness range of the stress absorption layer is obtained. Finally, according to the influence of asphalt surface and stress absorption layer thickness on the cracking times of asphalt surface layer, the fatigue life model of indoor simulation test was established by linear regression analysis. The mechanical response of each structure layer under the action of driving load is simulated by finite element software. The thickness and elastic modulus of the main structure layer are taken as the analysis variables, and according to the stress state of each structure layer, The reasonable thickness and elastic modulus of each structural layer are presented.
【學位授予單位】:東北林業(yè)大學
【學位級別】:碩士
【學位授予年份】:2015
【分類號】:U416.217
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