组合屏障在地铁沿线环境振动控制中的应用  

Application of Combinatorial Isolation Barriers in Environmental Vibration Control Induced by Metro

作　　者：郑国琛[1] 王逢朝 吴应雄[2] 蒋国平[1] ZHENG Guochen;WANG Fengchao;WU Yingxiong;JIANG Guoping(College of Engineering,Fujian Jiangxia University,Fuzhou 350108,China;College of Civil Engineering,Fuzhou University,Fuzhou 350116,China)

机构地区：[1]福建江夏学院工程学院,福建福州350108 [2]福州大学土木工程学院,福建福州350116

出　　处：《应用基础与工程科学学报》2019年第5期1115-1125,共11页Journal of Basic Science and Engineering

基　　金：国家自然科学基金项目(51778149);福建省自然科学基金项目(2017J01474);福建省高校重点实验室开放基金项目(2018K07)

摘　　要：隔振空沟、刚性填充屏障和柔性填充屏障在不同方面应用各有一定的局限性.建立适合于某城市地铁振源参数和沿线场地条件的车轨垂向耦合数值模型和隧道-土体有限元模型,设计3种组合屏障,对至隧道中心一定水平距离设置组合屏障后不同位置的地表面进行了隔振效果预测分析.结果表明:采用合适的组合屏障,能在相应的频段内有效的降低环境振动至合理限值区内;混凝土中空屏障的有效隔振频段为5~15Hz,克服了刚性填充屏障有效隔振频段距离影响的同时,对中高频段的振动放大效应也有了明显抑制作用;混凝土泡沫屏障兼具刚性和柔性填充屏障的隔振行为,除25~40Hz频段外,表现出较为稳定的隔振效果,特别是远距离的中高频段;泡沫混凝土中空屏障除25Hz的单点外,全频段在不同距离上拥有更加稳定隔振效果,不仅能将刚性填充屏障的中低频隔振优势发挥至屏障后更远场地,而且能有效提升中高频段的隔振水平.研究成果可针对相似于该城市场地条件,为不同设计施工条件下地铁沿线场地隔振提供参考.The isolation trench,rigid-filled and flexible-filled barriers have some limitations in different aspects.The vehicle-track coupled model of vertical vibration and the tunnel-soil model of 3 D FEM are established,and three combinatorical isolation barriers are designed.After establishing combinatorical isolation barriers at a certain distance away from vibration source,the isolation effects of surface points located at a variety of distances after barriers are predicted.The results show that the appropriate combinatorial isolation barriers can effectively reduce the environmental vibration to more reasonable interval in the corresponding frequency band.The effective frequency band of concrete hollow barrier is 5~15 Hz,compared to rigid-filled barrier,concrete hollow barrier can improve isolation effect at low and middle frequency bands in long-distance,and also inhibit vibration amplification at middle and high frequency bands.Concrete-foam barrier has dual isolation character of rigid-filled and flexible-filled barriers,and it can obtain stable isolation effect at most bands except 25~40 Hz,especially for middle and high frequency bands in long-distance.Concrete-foam hollow barrier can obtain more stable isolation effect at all bands except 25 Hz,it can not only fully play its isolation advantage at low and middle frequency bands to greater distance,but also effectively enhance the isolation effect at middle and high frequency bands.The research results can be referred by the environmental vibration control along the metro for different design and construction conditions which is applicable to site conditions similar to that of this city.

关 键 词：地铁振动 组合屏障 振动控制 隔振效果 预测分析 

分 类 号：TU435[建筑科学—岩土工程]