摘要
在传统波阻板的基础上,将屏障隔振改进为相同厚度的双层波阻板。基于非饱和多孔介质和弹性介质中的波动理论,研究非饱和土地基中双层波阻板对S波的隔离效应。根据Helmholtz原理,获得S波入射下非饱和土地基中设置双层波阻板后地表竖向位移解答。首先研究双层波阻板的材料参数对其隔振性能的影响规律,研究发现通过调控双层波阻板的密度和剪切模量能够使双层波阻板隔振屏障获得最优隔振效果;然后对比双层波阻板与相同材质的单层均质波阻板的隔振效果,并分析入射角、频率、饱和度、波阻板的厚度和埋深等物理力学参数对其隔振性能的影响规律。研究结果表明:同一厚度的波阻板隔振体系中,双层波阻板的隔振效率比同等材质的单层波阻板分别提高了49.18%和42.59%;双层波阻板对低频、中频和高频的环境振动均有较好的隔振效果。
This paper presents an improvement to the traditional wave impeding block(WIB)barrier by introducing a double-layer WIB with the same overall thickness.The investigation focuses on the isolation effect of the double-layer WIB on S-waves in an unsaturated soil foundation,Using wave theory in unsaturated porous and elastic media.Based on Helmholtz's principle,the vertical displacement at the ground surface under S-wave incidence after the installation of the double-layer WIB in an unsaturated foundation was derived and obtained.The study initially analyzed the influence of the material parameters of the double-layer WIB on its vibration isolation performance.It was found that the optimal vibration isolation effect could be obtained by adjusting the density and shear modulus of the double-layer WIB.Subsequently,the vibration isolation effects of double-layer WIB were compared with those of a single-layer homogeneous WIB composed of the same material.The analysis included examining the influences of various physical and mechanical parameters,such as incident angle,frequency,saturation,thickness,and buried depth of the WIB on its vibration isolation performance.Results indicated that for WIBs of the same thickness,the double-layer WIB exhibited significantly higher vibration isolation efficiency,49.18%and 42.59%higher than that of the corresponding single-layer WIB with the same material properties.The double-layer WIB demonstrated an effective vibration isolation effect across low,medium,and high frequencies in environmental vibrations.The double-layer WIB has a good vibration isolation effect on environmental vibration at low,medium,and high frequencies.
作者
江烨
马强
JIANG Ye;MA Qiang(School of Civil Engineering,Qinghai University,Xining 810016,Qinghai,China;Qinghai Provincial Key Laboratory of Energy-saving Building Materials and Engineering Safety,Xining 810016,Qinghai,China)
出处
《地震工程学报》
CSCD
北大核心
2024年第5期1126-1141,共16页
China Earthquake Engineering Journal
基金
国家自然科学基金(52168053)
青海省自然科学基金(2021-ZJ-943Q)。
关键词
双层波阻板
环境振动
隔振效果
非饱和土
振幅衰减系数
double-layer wave impeding block
environmental vibration
isolation effect
unsaturated soil
amplitude attenuation ratio
作者简介
第一作者:江烨(1998-),女,硕士研究生,主要从事土动力学与岩土工程抗震研究方面的工作。E-mail:jiangye0630@163.com;通信作者:马强(1990-),男,博士,副教授,主要从事土动力学与岩土工程抗震研究方面的工作。E-mail:maqiang0104@163.com。
