双向应力状态下沥青混合料动态性能试验研究

发布时间：2018-06-04 22:14

本文选题：沥青混合料 + 动态模量　；参考：《郑州大学》2017年硕士论文

【摘要】：沥青路面运营过程中,遭受实际行车动荷载作用。但是由于路线及车辆启动与刹车的影响,路面往往经受竖向正应力与水平剪切应力的共同作用。目前的动态设计理论还尚未完全成熟,特别是沥青混合料的动态模量仅考虑了竖向单轴的动荷载作用与路面实际受力状态不太相符,因此考虑压剪双向应力作用下沥青混合料动态模量,揭示路面动态响应机理,具有重要实际意义。本文采用竖向动态荷载和水平直剪动荷载作用,对沥青混合料圆柱形试件开展动态响应试验,分析不同动荷载及其组合作用下沥青混合料动态模量,主要内容有:(1)针对实际工程材料,通过马歇尔实验确定AC-13、AC-16和AC-20沥青混合料配合比,继而利用旋转压实仪成型试件。(2)考虑单轴竖向动荷载,在不同加载频率和温度条件下,开展沥青混合料动态模量实验,得出沥青混合料的动态模量随加载环境温度以及加载频率的变化规律。(3)采用水平直剪动荷载,在不同加载频率和温度条件下,开展沥青混合料剪切动态模量实验,并分析加载频率和温度对剪切动模量影响。(4)采用竖向和水平直剪动荷载共同作用,在不同加载频率和温度条件下,开展沥青混合料双向应力状态下动态模量试验,结果对比表明双向应力状态下竖向动模量值明显小于单向加载,而水平剪切模量试验值迅速增大,说明加入竖向荷载可以削弱很大一部分剪切力的影响。
[Abstract]:During the operation of asphalt pavement, the actual driving load is subjected to actual driving. However, due to the influence of the route and the vehicle's start and brake, the pavement often suffers from the joint action of vertical stress and horizontal shear stress. The dynamic design theory of the asphalt pavement is not yet fully mature, especially the dynamic modulus of the asphalt mixture only takes the vertical single axis into consideration. The dynamic load of the pavement is not quite consistent with the actual stress state of the pavement. Therefore, considering the dynamic modulus of asphalt mixture under the action of compression shear and two-way stress, it is of great practical significance to reveal the dynamic response mechanism of the pavement. The dynamic modulus of asphalt mixture under different dynamic loads and its combination are analyzed. The main contents are as follows: (1) according to actual engineering materials, the mixture ratio of AC-13, AC-16 and AC-20 asphalt mixture is determined through the actual engineering materials, and then the molding test parts are used by the rotary compactor. (2) the single axis vertical dynamic load is considered, and under the different loading frequency and temperature conditions, it is open. The dynamic modulus of asphalt mixture is tested, and the dynamic modulus of asphalt mixture varies with the loading environment temperature and loading frequency. (3) the shear dynamic modulus experiment of asphalt mixture is carried out under the different loading frequency and temperature, and the effect of loading frequency and temperature on the shear modulus is analyzed. (4) the dynamic modulus test of asphalt mixture under the condition of different loading frequency and temperature is carried out under the joint action of vertical and horizontal shear loads. The results show that the vertical dynamic modulus is obviously less than the unidirectional loading under the state of two-way stress, and the test value of the horizontal shear modulus increases rapidly, indicating the vertical direction of the shear modulus. Load can weaken the influence of a large part of shear force.
【学位授予单位】：郑州大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U414

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