空沟-波阻板联合隔振屏障的试验研究与数值分析  

Experimental research and numerical analysis of an open Trench-WIB barrier

作　　者：周凤玺[1] 周志雄 梁玉旺 刘佳 马强 ZHOU Fengxi;ZHOU Zhixiong;LIANG Yuwang;LIU Jia;MA Qiang(School of Civil Engineering,Lanzhou University of Technology,Lanzhou 730050,China;School of Civil Engineering,Qinghai University,Xining 810016,China)

机构地区：[1]兰州理工大学土木工程学院,甘肃兰州730050 [2]青海大学土木工程学院,青海西宁810016

出　　处：《岩土工程学报》2023年第S02期55-60,共6页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金项目(12362032,51978320);甘肃省重点研发计划项目(23YFFA0063)。

摘　　要：采用模型试验和数值模拟相结合的方法研究了空沟-波阻板联合隔振屏障对竖向简谐荷载的隔振效果。首先,对比了空沟-波阻板联合屏障与空沟屏障的隔振效果,试验结果表明:空沟-波阻板联合屏障在各个激振频率下的隔振效果均优于空沟屏障,在低频段最为明显。然后,结合完全匹配层吸收边界,利用COMSOL建立了简谐荷载作用下弹性半空间中设置空沟-波阻板联合隔振屏障的三维有限元模型,并通过加速度振幅衰减系数来评价隔振效果,研究了空沟-波阻板联合屏障的几何参数对其隔振效果的影响。结果表明:空沟-波阻板联合屏障的几何参数对其隔振效果影响较大。其中,空沟深度越大,隔振效果越好,但在频率较低时有所不同;波阻板深度以及屏障长度越大,联合屏障的隔振效果越好。此外,空沟-波阻板联合屏障更适用于近场主动隔振。The vibration isolation effects of an open trench-WIB barrier on the vertical harmonic loads are studied by using the combined method of model tests and numerical simulations.Firstly,the vibration isolation effects of the open trench-WIB barrier and the open trench are compared.The experimental results show that the vibration isolation effects of the combined barrier are better than those of the open trench barrier at each excitation frequency and the most obvious in the low frequency.Then,combined with the perfectly matched layer absorption boundary,a three-dimensional finite element model is established using the COMSOL to set up the open trench-WIB barrier in an elastic half space under harmonic loads.The vibration isolation effects are evaluated through the acceleration amplitude attenuation coefficient,and the influences of the geometric parameters of the combined barrier on the isolation effects are studied.The results show that the geometric parameters of the combined barrier have a great influence on the vibration isolation effects.The larger the depth of the open trench,the better the isolation effects,but different in the low frequency.Meanwhile,the larger the depth and length of the WIB,the better the vibration isolation effects of the combined barrier.Moreover,the open trench-WIB barrier is more suitable for the near-field active vibration isolation.

关 键 词：地基隔振 空沟-波阻板联合屏障 模型试验 相似理论 数值模拟 

分 类 号：TU435[建筑科学—岩土工程]