【摘要】：目前我國瀝青路面半剛性基層材料主要是水硬性結(jié)合料處治的穩(wěn)定碎礫石基層材料,由于外界因素的影響以及筑路材料本身的特性,半剛性基層極易產(chǎn)生初始裂縫�；鶎右坏╅_裂,在交通荷載、溫濕度變化以及其他因素作用下,裂縫尖端產(chǎn)生應力集中,導致裂縫向面層方向擴展,進而加速路面結(jié)構(gòu)的破壞進程,嚴重影響瀝青路面結(jié)構(gòu)的長期使用性能及使用壽命。因此,對半剛性基層反射裂縫的擴展研究具有重要的理論意義和工程價值。對于半剛性基層反射裂縫擴展的問題,既有研究大多只考慮了交通荷載的影響,也有少部分研究了溫度的影響,但對于交通荷載和溫度共同作用下的研究極少;另一方面,既有研究大多采用傳統(tǒng)有限元的數(shù)值模擬方法,此方法在計算精度等方面存在嚴重的缺陷;并且,既有研究均以摩擦系數(shù)表征層間接觸狀態(tài),此方法僅能模擬靜態(tài)的接觸狀態(tài);此外,既有研究中對于瀝青混合料本構(gòu),大多采用線彈性,少部分采用靜粘彈性,極少部分采用動態(tài)模量但沒有同時考慮加載頻率和溫度的影響。鑒于以上分析,本文著眼于擴展有限元法在模擬裂縫擴展類問題的優(yōu)勢,利用ABAQUS軟件及其XFEM模塊,瀝青混合料采用考慮受加載頻率和溫度影響的動態(tài)模量,并基于漸進損傷的脫層失效理論模擬基面層之間動態(tài)的層間接觸狀態(tài),分析了瀝青路面半剛性基層反射裂縫的擴展,主要內(nèi)容如下:(1)利用ABAQUS軟件及其XFEM模塊,采用瀝青混合料受加載頻率和溫度影響的動態(tài)模量本構(gòu),考慮反射裂縫擴展至面層和未擴展至面層兩種狀態(tài),建立了瀝青路面半剛性基層反射裂縫擴展的三維擴展有限元模型。(2)分析交通荷載單獨作用下半剛性基層反射裂縫的擴展,研究了動載作用下各種影響因素對基層反射裂縫擴展的影響,并基于漸進損傷的脫層理論研究了基面層間的結(jié)合狀態(tài)對反射裂縫擴展的影響。(3)分析溫度非周期性變化和周期性變化作用下半剛性基層反射裂縫的擴展,研究了溫度作用下各種影響因素對基層反射裂縫擴展的影響,并基于漸進損傷的脫層理論研究了基面層間的結(jié)合狀態(tài)對反射裂縫擴展的影響。(4)分析交通荷載和溫度周期變化與非周期性變化共同作用下半剛性基層反射裂縫的擴展,在交通荷載單獨作用、溫度單獨作用、交通荷載與溫度共同作用下,對比分析半剛性基層反射裂縫的擴展情況以及基于Paris公式的疲勞擴展壽命。
[Abstract]:At present, the semi-rigid base material of asphalt pavement in China is mainly treated by hydraulic binder. Due to the influence of external factors and the characteristics of road construction materials, the semi-rigid base is prone to produce initial cracks. Once the base is cracked, under the action of traffic load, temperature and humidity change and other factors, the crack tip produces stress concentration, which leads to the crack spreading to the surface, and then accelerates the damage process of the pavement structure. The long-term service performance and service life of asphalt pavement structure are seriously affected. Therefore, it has important theoretical significance and engineering value to study the propagation of reflection cracks in semi-rigid base. For the problem of reflection crack propagation of semi-rigid base, most of the studies only consider the influence of traffic load, but also a small part of the study of temperature, but the study of traffic load and temperature together is very rare. On the other hand, the traditional finite element numerical simulation method is mostly used in the existing research, which has serious defects in the calculation accuracy and so on. Moreover, the friction coefficient is used to characterize the contact state between the layers, and this method can only simulate the static contact state. In addition, linear elasticity, static viscoelasticity and dynamic modulus are used in most of the existing studies, but the effects of loading frequency and temperature are not considered. In view of the above analysis, this paper focuses on the advantages of the extended finite element method in simulating crack propagation problems. Using ABAQUS software and its XFEM module, the dynamic modulus of asphalt mixture considering the influence of loading frequency and temperature is adopted. Based on the delamination failure theory of progressive damage, the dynamic interlayer contact state between the base layers is simulated, and the propagation of reflection cracks in semi-rigid base course of asphalt pavement is analyzed. The main contents are as follows: (1) using ABAQUS software and its XFEM module, The dynamic modulus constitutive model of asphalt mixture affected by loading frequency and temperature is adopted, and the reflection crack is considered to extend to the surface layer and not to the surface layer. The finite element model for the reflection crack propagation of semi-rigid base course of asphalt pavement is established. (2) the propagation of reflection crack of semi-rigid base course under the action of traffic load alone is analyzed. The influence of various factors on the propagation of reflection crack in the base course under dynamic load is studied. Based on the delamination theory of progressive damage, the influence of the bonding state between the base layers on the propagation of reflective cracks is studied. (3) the propagation of reflection cracks in semi-rigid base is analyzed under the action of non-periodic and periodic temperature variations. The influence of various factors on the propagation of reflection cracks in the base course under the action of temperature is studied. Based on the delamination theory of progressive damage, the influence of the bonding state between the base layers on the propagation of reflective cracks is studied. (4) the propagation of reflective cracks in semi-rigid base is analyzed under the combined action of traffic load and temperature periodic variation and non-periodic variation. Under the combined action of traffic load, temperature, traffic load and temperature, the propagation of reflection crack in semi-rigid base and fatigue life based on Paris formula are compared and analyzed.
【學位授予單位】：北京交通大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：U416.217

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