Research On Material Parameters And Boundary Condition Of The Tunnel Model Dynamic Test

In recent years, along with our country’s urbanization and the advancement of the western development strategy, special complex tunnel engineering such as high intensity area tunnel and complicated geological conditions tunnels will increasingly show in front of the project builders. Tunnel model test can avoid under a certain degree of theoretical research of many not very not reasonable assumptions, a more real simulation of reality, so in the research of this kind of engineering plays an important role.Test simulation of tunnel-soil structure can fully reflect the real structure of the various features accurately is prerequisite to test the accuracy, and the one of the most important factors influencing the test accuracy is tunnel model material can meet the prototype and the model put forward by similarity theory between the physical and mechanical parameters. This deviation is not eliminated but it must be as small as possible. In this case, the study simulated material parameters deviation on the result of the test data of test precision are purposefully control is of great importance, in this paper, based on a scientific research project of national natural science fund of the seismic design of tunnel buried depth of the dynamic characteristics based on the method ", mainly for the following several aspects work:①both at home and abroad are summarized the problems related to current status of dynamic test of the tunnel, and based on the similarity theory model to simulate material research status.②tunnel is discussed the rational calculation area the soil structure, which gives the prototype under the effect of dynamic calculation model.③to study the simulation of rock material elastic modulus, density, poisson’s ratio, cohesive force and Angle of internal friction of relative similarity theory proposed by similar material parameters strictly than deviation for the influence of the accuracy.④to study the simulation of lining material elastic modulus, density, poisson’s ratio, relative similarity theory proposed by similar material parameters strictly than deviation for the influence of the accuracy.⑤to study the boundary buffer material influence on the accuracy of density and thickness.According to the results, the author of this paper concludes internal and simulated contact model framework should be set at a certain thickness of boundary buffer layer, simulation of the surrounding rock elastic modulus, poisson’s ratio, density deviation for a greater influence on the dynamic accuracy of the experimental data, the material parameters deviation should be strictly controlled within the allowable error; Simulation lining elastic modulus, density deviation, deviation of poisson’s ratio for power little effects on the precision of the experimental data, the parameter error can be appropriate to relax; Simulation of lining material USES plaster:barite:Shi Yingsha:water:Neoprene adhesive=1:1:1.5:1.3:0.3(weight ratio); Simulation of rock materials using quartz sand:rosin alcohol solution:neoprene adhesive:barite:water:gypsum=1:0.418:0.34:4.47:0.472:0.185(weight ratio).