本文選題：瀝青路面 + Top-Down裂紋　； 參考：《沈陽建筑大學學報(自然科學版)》2017年02期

【摘要】：目的研究瀝青路面雙Top-Down裂紋在移動荷載作用下的擴展特性.方法基于斷裂力學與動力學理論,考慮瀝青混合料的黏彈性特性,采用有限元數值模擬方法,研究含雙Top-Down裂紋瀝青路面在移動荷載下的動力響應,分析裂紋間距與面層材料類型對裂紋尖端應力強度因子的影響.結果在移動荷載的作用下,雙裂紋并存時面層加速發(fā)生Ⅰ、Ⅱ型開裂擴展要比單裂紋的情形更為嚴重;對于居中裂紋,隨著裂紋間距的增大,K_Ⅰ的峰值略有增加,而KⅡ的左峰值逐漸增大,右峰值則逐漸減小;對于側邊裂紋,K_Ⅱ峰值隨裂紋間距的變化規(guī)律與居中裂紋相反;當荷載作用在居中裂紋或側邊裂紋正上方時,就裂紋間距而言,間距大易引發(fā)Ⅰ型裂紋擴展,間距小易引發(fā)Ⅱ型裂紋擴展.結論在移動荷載作用下,對于已存在居中裂紋或側邊裂紋的面層,改性瀝青SMA材料Ⅰ的抗開裂擴展性能最優(yōu),改性瀝青AC材料Ⅲ其次,而普通瀝青AC材料Ⅱ最差.
[Abstract]:Aim to study the propagation characteristics of double Top-Down cracks in asphalt pavement under moving load. Methods based on the theory of fracture mechanics and dynamics, considering the viscoelastic properties of asphalt mixture, the dynamic response of asphalt pavement with double Top-Down cracks under moving load was studied by finite element method. The influence of crack spacing and surface material type on the stress intensity factor at crack tip is analyzed. Results under the action of moving load, the acceleration of mode 鈪，

本文編號：1819098