构建了饱和土中夹水混凝土复合隔振屏障计算模型，通过引入势函数及利用饱和土与混凝土及混凝土与水交界面的连续性边界条件，求解了P波穿过隔振屏障后位移振幅衰减系数的解析解。研究结果表明，屏障的隔振效果与入射波的入射角有关，入射角在14度左右时，屏障的隔振效果最差，之后随入射角的增大，隔振效果总体越来越好；垂直入射时，屏障隔振效果随混凝土层厚及水层宽度增加先减弱后增强，随混凝土弹性模量及泊松比的增加而减弱；入射角为30度时，隔振效果随混凝土厚及水层宽度增加先增强后减弱，当混凝土厚和水层宽为入射波波长的1倍和0.3倍时，位移振幅基本衰减为0，随混凝土弹性模量及泊松比的增加，隔振效果增强，且弹性模量对隔振效果影响更为明显，泊松比影响不大；随入射波频率增加屏障的隔振效果总体越来越好。
Abstract
A dynamic model for a concrete-water-concrete composite vibration isolation barrier in saturated soil was established.The analytical solution to the delay coefficient of displacement amplitude of P wave passing through the barrier was obtained by introducing the potential function and using continuous boundary conditions on interfaces of saturated soil-concrete and concrete-water.The results showed that the vibration isolation effect of the barrier is related to incident wave’s incident angle, the barrier’s isolation effect is the minimum at incident angle of 14°, and then the barrier’s isolation effect gets better with increase in incident angle; at vertical incidence, the barrier’s isolation effect decreases at first and then increases with increase in concrete layer thickness and water layer width, it decreases with increase in concrete elastic modulus and Poisson’s ratio; when incident angle is 30°, the barrier’s isolation effect increases at first and then decreases with increase in concrete layer thickness and water layer width, when concrete layer thickness and water layer width are 1 time and 0.3 time of incident wave length, respectively, displacement amplitude decay basically is 0, the barrier’s vibration isolation effect increases with increase in concrete elastic modulus and Poisson’s ratio, and concrete elastic modulus affects the barrier’s vibration isolation effect more obviously than Poisson’s ratio does; the barrier’s isolation effect gets better with increase in incident wave frequency.
关键词
饱和土 /
混凝土 /
水层 /
隔振屏障
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Key words
Saturated soil /
Concrete /
Water layer /
Isolation barrier
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