空沟、碎石填充沟和排桩隔振效果试验研究

Experimental Study on Vibration-isolation Effects of Open Trench, Gravel-filled Trench, and Piles in a Row

摘要:

高速铁路、地铁、轻轨等轨道交通迅速发展深入城市内部人群密集地区,对环境产生的振动影响不容忽视。空沟、碎石填充沟和排桩是三种常用的轨道交通隔振措施。通过大比例尺试验,采用加速度作为振动的评价指标,分别研究空沟、碎石填充沟和排桩的隔振效果。各组试验除隔振措施外其他条件均完全相同,使不同隔振措施的隔振效果具有较强的可比性,通过比较三种隔振措施与无隔振措施下影响区的加速度衰减率,评价其隔振效果,同时通过三种隔振措施下距离振源不同位置处的加速度比较其隔振效果。研究成果可为轨道交通隔振措施及方案的选取提供依据。

Abstract:

Rail transportation such as high-speed railways,metros,and skytrains develop fast and go deep into the densely populated inner cities,where its vibration impact on the environment cannot be ignored.Open trenches,gravel-filled trenches,and piles in a row are three common vibration-isolation measures.We established a model test,which uses the acceleration as the evaluation index of vibration,and studied the vibration-isolation effects of open trenches,gravel-filled trenches,and piles in a row.Test conditions among each group of tests are the same except for the isolation measure.Each isolation measure's isolation effect can be analyzed by contrasting the results between this isolation measure and the test group without an isolation measure;the effects of different isolation measures can be analyzed by contrasting the results between test groups without different isolation measures,so the effects of different vibration-isolation measures can be objectively evaluated.