摘要
采用Marc有限元软件的非线性三维有限元方法对强夯工程中的隔振沟的隔振作用进行了动力分析。分析表明,强夯在地表产生的振动随离夯点距离的增加而衰减,超过临界距离后地表振动显著减小,因此超过一定距离的建筑不受强夯振动的影响。在强夯振动影响范围内的建筑可通过设置隔振沟消除振动影响。计算表明,隔振沟设置距离夯点越近越好,隔振沟的宽度对隔振效果影响不大,其深度对隔振效果影响显著。因此隔振沟深度一般不宜小于2m。有限元分析结果在一个强夯工程实例中得到应用和验证,对其他工程有一定参考作用。
Dynamic analysis is carried out on the effect of vibration-isolating ditch in dynamic compaction using 3D nonlinear dynamic finite method of Marc FEM software.Analysis results show that the vibration of ground surface caused by dynamic compaction decreases rapidly with distance increases.The ground surface vibration reduces significantly to very low level beyond the critical distance.Therefore,buildings beyond a certain distance from the compaction position will not affected by the vibration,otherwise vibration isolation ditches should be used to mitigate the effect.Results also show that the closer the vibration isolation ditch is set to the compaction position the better the vibration isolation effect is.The depth of the ditch has vital effect on the vibration isolation efficiency while the width has little effect.So the depth of the ditch is recommended more than 2m for common engineering.The FEM analyses are applied and verified in a dynamic compaction project,which could be a reference to the similar engineering.
出处
《工程勘察》
2013年第9期19-22,27,共5页
Geotechnical Investigation & Surveying
关键词
强夯
隔振沟
有限元
距离
深度
dynamic compaction
vibration isolation ditch
FEM
distance
depth
