Analysis Of Vibration Isolation Effect And Soil Vibration Response Of Hollow Ditch On Homogeneous And Layered Foundation

With the development of society,various kinds of artificial vibration pollution are becoming more and more frequent,and the impact on neighboring buildings,precision instruments and equipment and people’s lives is becoming more and more serious.The treatment of various artificial vibration pollution has become one of the important issues that need to be solved urgently.Empty trench vibration isolation is an effective method for vibration pollution control and is widely used in engineering practice.However,the current research on vibration isolation of hollow trenches is limited to the factors of the barrier itself,and the influence of the soil parameters where the hollow trench is located is rarely involved.In this thesis,model tests and finite element simulation physical field simulations are used to explore the influencing factors and specific change rules of the vibration isolation effect of hollow trenches.The main research contents are as follows:(1)Through the model test,the layered soil foundation is used,the rectangular opening trench is set,and the parameters of the trench are changed,and the influence of the factors of the trench itself on the vibration isolation effect is analyzed;and the location of the trench and the vibration source are further explored.The effect of distance and frequency on its vibration isolation effect was investigated.The results showed that the vibration isolation effect of the hollow trench was mainly determined by the depth.The greater the depth of the hollow trench,the better the vibration isolation effect.,the vibration isolation effect will be attenuated.(2)Three kinds of trenches with different depths were analyzed,and the influence of width,vibration source distance,trench position and frequency changes on the vibration isolation effect of the three trenches was explored.The results show that the three trenches vary in other factors.When the vibration isolation effect changes,the vibration isolation effect varies.Among them,the change of the trench position has the least impact on the vibration isolation effect.When the width,vibration source distance and frequency change,the impact of the trench at the interface is lower than that of the other two depth trenches..(3)Using finite element simulation physics software,establish large-scale twodimensional ditch homogeneous soil foundation model and layered soil foundation model,and compare the vibration isolation of ditch with two different foundation conditions: homogeneous soil and layered soil The effect is different,and the influence of three factors of soil elastic modulus,Poisson’s ratio and density on the vibration isolation effect of the hollow trench under different geological conditions is analyzed.The effect is not significant,but the greater the density in layered soil,the correspondingly greater the soil mass;the influence of elastic modulus in homogeneous soil has no obvious regularity,but it is obvious in layered soil foundation;Poisson’s ratio has a significant effect on soil The influence of the body vibration response is very small,but the influence on the vibration strengthening phenomenon near the soil interface is relatively regular.