1.Jiangxi Provincial Key Lab of Infrastructure Safety Control in Geotechnical Engineering, East China Jiaotong University, Nanchang 330013, China; 2.Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China;
3.Jiangxi Harbor and Navigation Administration, Nanchang 330000, China
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.
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