Study On Numerical Simulation And Dynamic Analysis Of Semi-infinite Soil

In recent years, the rail transit has developed rapidly in our country, and the noise and vibration from rail transit can also bring a lot of influence to people's daily life. In order to research and give a solution to this problem, this paper, through studying the propagation discipline of the vibration wave in the semi-infinite soil, gains a certain conclusion and as a result provides reference to the relevant research about the field of environment vibration.This paper attempts to use a method of numerical simulation to simulate and study the wave propagation in semi-infinite soil. In this process, in order to simulate the semi-infinite soil more accurately, the author seeks out a satisfying element and uses the MATLAB software to calculate out the stiffness matrix of this element, in the end, the author applies the stiffness matrix in self-compiled dynamic program to calculate. This paper gives a brief introduction about the research situation on the vibration wave propagation in the semi-infinite soil at home and abroad, and emphatically introduces the theory about the solution of the element's stiffness matrix, in detail, the author deduces stiffness matrix of a compatible element with twenty nodes. Meanwhile, through the static analysis, compare the accuracy of the element with twenty nodes and that with eight nodes, as a result, it proves that the superiority of the element with twenty nodes. The paper uses an artificial sticky-elastic three-dimensional boundary and obtains a certain satisfying effect. In addition, the paper provides an engineering example to show the propagation characteristics of the vibration wave in the semi-infinite soil, finally it proves that the method of numerical simulation is accurate and feasible in engineering application.