Numerical simulation of shear-wave seismic vibrator-ground coupled vibration system
The interaction between the shear-wave seismic vibrator and the ground is complicated,and involves uneven contact,soil plasticity,friction,and burial depth.However,there are rare references in the systematic re-search on the coupled vibration of the shear-wave vibrator-ground systems.Thus,this paper builds a three-dimen-sional numerical simulation model of a shear-wave seismic vibrator-ground system considering multiple nonlinear fac-tors.The coupled vibration characteristics of the system are analyzed from aspects of the strain distribution and de-formation at the contact interfaces,the vibration output force,the shear wave propagation,and the energy transfer characteristics.Meanwhile,the effects of soil types,elastic modulus,and cohesion on the response characteristics of the system are investigated.The results show that there is contact asymmetry between the vibrator plate and ground due to the load mode and the soil plastic deformation,which can bring about local decoupling of the plate.The effective output force of the vibrator is only a part of the contact force,and there are obvious harmonic distor-tions in the generated seismic waves.The effective energy transferred from the shear-wave vibrator to the ground is limited,with a low effective energy transfer ratio of the coupling system.The soil parameters have a significant in-fluence on the vibrator output and energy transfer characteristics,and the vibrator operates better in clay soil.Addi-tionally,the soil elastic modulus is the main controlling factor for the vibrator plate decoupling,while increasing the soil cohesion can improve the energy transfer characteristics of the system.Therefore,numerical simulation can ana-lyze the coupled vibration characteristics of the shear-wave vibrator-ground system,providing theoretical references for the structural design and optimization of the vibrators.
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