Numerical Simulation Of Saturated Porous Media Soil Dynamics And Its Application In Open Trenches Vibration Isolation

The study of the dynamic response of saturated porous media is of great significance in practical engineering.Based on the theoretical basis of the predecessors,this paper deduces two numerical calculation forms of two-phase saturated porous media,completes the method verification,and applies the method to saturate.The research on the effect of vibration isolation of soil hollow trenches,the main research work carried out and the conclusions of the research obtained are as follows:1.Based on the two-phase porous medium model of Biot saturated porous medium theory and mixture theory,the u-p,u-U,and u-p-U dynamic control equations of solid-phase skeleton and liquid-liquid coupling are improved,and weak and generalized models are derived.A dynamic coupling equation that conforms to the finite element calculation form of this paper.2.The numerical simulation software is used to calculate and analyze the typical examples of the dynamic coupling equations.The numerical simulation results are compared with the previous calculation results,and the verification method based on the theory of porous medium theory for saturated two-phase medium dynamic reaction is completed.The calculation results of the dynamic two-phase medium dynamic response u-p,u-U,u-p-U calculation methods are compared with the previous ones.3.The u-p coupled weak solution type is selected and the viscous artificial boundary conditions are more suitable.From the homogeneous foundation,whether there are empty trenches,homogeneous soil saturated soil parameters,homogeneous foundation gutter geometry parameters,homogeneous foundation trench location,The geometrical parameters of the layered foundation and the location of the layered foundation are studied in the six aspects.The influence of single parameters on the vibration isolation effect of the empty trench is discussed.4.The research conclusion are as follows:(1)The setting of the hollow trench in the homogeneous foundation is beneficial to vibration isolation.(2)Porosity and Poisson's ratio have a great influence on the vibration isolation of homogeneous foundation.The increase of porosity and Poisson's ratio is not conducive to the vibration isolation of the empty trench.(3)The depth of the empty trench has a great influence on the vibration isolation of the homogeneous foundation.The increase of the empty trench is beneficial to the vibration isolation of the empty trench.The effect of the width of the hollow trench on the vibration isolation of the homogeneous foundation trench is small.(4)The installation position of the empty trench has a significant influence on the vibration isolation effect of the homogeneous foundation.When the position of the research point is fixed from the center of the load,it is more advantageous to set the empty trench as close as possible to the research point.The effect of vibration isolation(5)The effect of the depth of the groove and the width of the groove on the vibration isolation of the layered foundation is not obvious.(6)The influence of the position of the empty trench on the vibration isolation effect of the layered foundation is basically consistent with the influence law of the vibration isolation effect of the homogeneous ground.