摘要
兰新铁路第二双线(新疆段)穿越五大风区,风区地段,强风携带的沙粒对兰新铁路混凝土结构产生严重的冲蚀磨损,造成混凝土结构耐久性的降低。本文针对戈壁风沙流环境特点,采用气流挟沙喷射法,对混凝土结构材料进行冲蚀磨损试验,研究冲击参数(冲蚀速度、角度和时间)对混凝土冲蚀磨损的影响。实验结果表明,混凝土靶材在各冲蚀速度下,90°冲蚀时冲蚀率最高,而30°冲蚀时冲蚀率最低,与传统的脆性材料的冲蚀规律相一致。在不同攻角下,冲蚀速度越大,冲蚀率越高;在低角度冲蚀时,速度指数与传统的脆性材料的冲蚀模型预测值相一致,而在高角度冲蚀时,速度指数偏离了理论预测范围。随着冲蚀时间的延长,混凝土材料的冲蚀率逐渐降低,且冲蚀率开始下降迅速,而后逐渐变缓。
The second double-track section in Xinjiang of Lanzhou-Xinjiang railway crosses five wind areas. In these areas, railway concrete structure are seriously eroded by grains of sand carried by strong winds, causing the durability of concrete construction to reduce. In this paper, the erosion wear test of concrete samples were carried out by gritblasting experiments, and the effect of impact parameters, such as erosion speed, angle and time, on the concrete erosion wear was investigated. The results show that under different erosion speed for concrete target material , erosion rates were highest at 90° impact, and lowest at 30° impact, which was consistent with traditional brittle material erosion laws. At different attack angles, the erosion rate increased with increasing of erosion speed. In the low angle erosion, speed index was consistent with the value predicted by traditional brittle material erosion model, however, in high angle erosion, speed index deviated from the theoretical prediction range. The erosion rate of concrete material decreased gradually with the extension of erosion time, and the erosion rate began to decline rapidly, and then gradually became slow.
出处
《硅酸盐通报》
CAS
CSCD
北大核心
2013年第4期607-612,共6页
Bulletin of the Chinese Ceramic Society
基金
长江学者和创新团队发展计划资助(IRT1139)
关键词
冲击参数
兰新铁路
混凝土
冲蚀磨损
impact parameters
lanxin railway
concrete
erosion wear
