摘要
为了研究轨道交通荷载引起季节冻土区饱和土场地环境振动的特性及其衰减关系,分别于冬季和夏季对位于黑龙江省大庆市龙凤湿地的轨道交通周围环境振动情况进行了现场观测。通过对垂直轨道方向布设台阵各点实测数据进行分析、处理,得到列车通过时台阵各点振动时程曲线及功率谱。在去除本底振动的基础上,得到轨道交通引起季冻区饱和土场地冬夏两季地面振动衰减曲线。结果表明:随着距轨道中心线距离的增加,振动的最大加速度幅值大体上呈衰减趋势,并且在某些位置存在振动放大区,冬季和夏季振动放大区的位置不同;夏季环境振动衰减比冬季环境振动衰减速度快;近轨道位置冬季和夏季环境振动的能量聚集不同。
In order to investigate the environmental vibration characteristics caused by rail traffic load in seasonal frozen saturated soil site and the vibration attenuation, a practical test of ground vibration caused by rail traffic has been conducted in Longfeng wetland of Daqing, Heilongjiang province in the winter and summer respectively. The vibration time histories and power spectrum when the train passed by in array were obtained. On the basis of remov- al the background vibration, the environmental vibration attenuation of the winter and summer caused by rail traffic in seasonal frozen saturated soil site was got respectively. The test results showed that, the maximum acceleration amplitude of vibration was substantially decreased with the increasing distance from the point to the track. But there are local vibration amplifications at certain positions, and the positions of vibration amplification regions are differ- ent in winter and summer. The vibration attenuation is steeper in summer than in winter, and energy focus regions of near the track zone of environment vibration are different in summer and in winter.
出处
《地震工程与工程振动》
CSCD
北大核心
2017年第2期173-180,共8页
Earthquake Engineering and Engineering Dynamics
基金
黑龙江省教育厅科学技术研究项目(12531441)
黑龙江省自然科学基金面上项目(E201330)
黑龙江省博士后资助项目(LBHZ13211)~~
关键词
轨道交通
季冻区
饱和土场地
环境振动
衰减关系
rail traffic
seasonal frozen region
saturated soil site
environment vibration
attenuation relationship
