摘要
[目的]在城市轨道交通运营过程中,列车运行引起的振动会对沿线建筑物和精密仪器造成损害,甚至影响人们的日常生活。因此,需研究有效的减振措施。[方法]以雄安轨道交通R1线大里程明挖段区间隧道为例,用橡胶土代替素填土,采用数值模拟方法,在ABAQUS软件中建立相应的隧道-地层有限元模型,分析橡胶土不同阻尼比对明挖隧道的隔振作用。[结果及结论]采用阻尼比为0.04的橡胶土进行回填,最大可使地面竖向振动加速度减小6.2%,振动加速度级降低1.1%;采用阻尼比为0.06的橡胶土进行回填,最大可使地面振动加速度减小11.4%,振动加速度级降低1.3%。两种阻尼比橡胶土对明挖隧道的隔振效果均较为明显。相同测点位置处,阻尼比为0.06的橡胶土对振动加速度、振动加速度级的降低幅度总体大于阻尼比为0.04的橡胶土,最大降低幅度分别可达5.2%及0.667%。
[Objective]During the operation of urban rail transit,the train operation induced vibration can damage buildings and precision instruments along the line,and even affect people's daily lives.Therefore,effective vibration reduction measures need to be studied.[Method]The long-mileage open-cut section tunnel of Xiong'an Rail Transit R1 Line is taken as an example,which uses rubber soil instead of plain fill.With numerical simulation method,a corresponding tunnel-stratum finite element model is established in ABAQUS software to analyze the vibration isolation effect of different rubber soil damping ratios on open-cut tunnels.[Result&Conclusion]Using rubber soil with a damping ratio of 0.04 for backfilling can reduce the ground vertical vibration acceleration by 6.2%and the vibration acceleration level by 1.1%at most;using rubber soil with a damping ratio of 0.06 for backfilling can reduce the ground vibration acceleration by 11.4%and the vibration acceleration level by 1.3%at most.The vib-ration isolation effect of rubber soil with the above two damping ratios on open-cut tunnels is quite obvious.At the same measuring point,the reduction amount of vibration acceleration and vibration acceleration level by rubber soil with a damping ratio of 0.06 is generally greater than that by rubber soil with a damping ratio of 0.04,with the maximum reduction rates reaching 5.2%and 0.667%respectively.
作者
殷东昊
金浩
夏瑞萌
顾兴宇
YIN Donghao;JIN Hao;XIA Ruimeng;GU Xingyu(School of Transportation,Southeast University,211189,Nanjing,China;Beijing Urban Construction Design&Development Group Co.,Ltd.,100037,Beijing,China)
出处
《城市轨道交通研究》
北大核心
2024年第12期213-218,共6页
Urban Mass Transit
基金
国家自然科学基金项目(52378443)
江苏省自然科学基金项目(BK20211173)。
关键词
地铁
明挖隧道
橡胶土回填
隔振效果
subway
open-cut tunnel
rubber soil backfill
vibration isolation effect
