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利用均匀设计安排参数组合对高模量基层路面结构应力分布进行了有限元计算,并利用莫尔圆分析了高模量基层路面结构中不同深度的应力状态,重点对比了不同位置不同深度各点的主应力组成方式,并观察到高模量基层路面表层各点的主应力组成方式出现拉-压复合剪切现象。认为:(1)拉-压复合剪切状态的存在,使得路面在疲劳荷载作用下,有两种接近路面材料临界物态线的方式,拉-压复合剪切状态是不同温度下TOP-DOWN裂纹与车辙破坏的重要诱因之一,疲劳状态下各点主应力组成方式不同,对路面结构的疲劳寿命有重大影响;(2)莫尔包络线可以简化为由内聚力c和抗拉强度σt控制。未来,高温条件下的内聚力c和抗拉强度σt有可能作为路面材料拉剪疲劳控制指标。
The stress distribution in the high modulus base pavement was calculated by using uniform design parameters. The stress state at different depths in high modulus base pavement structure was analyzed by Moire circle. The main stress components of the surface of the high modulus base pavement appeared the phenomenon of tension-compression composite shearing. The results show that: (1) The combination of tension-compression shear state makes the pavement under fatigue load have two ways of approaching the critical state line of pavement materials. The tension-compression composite shear state is under the condition of TOP-DOWN Crack and rutting are one of the important inducing factors. Under different fatigue conditions, the main stress components are different and have a significant influence on the fatigue life of the pavement structure. (2) The Moiré envelope can be simplified as cohesion c and tensile strength σt control. In the future, cohesion c and tensile strength σt under high temperature conditions may be used as an index for controlling tensile fatigue of pavement materials.