Shaking Table Test For The Design Of Different Depths’ Tunnel Studies

With the rapid development of China’s social and economic, accelerate development of the western mountain region is becoming an increasingly urgent, which had driven the development of China’s tunnel construction projects. For the needs of preventing disasters and reducing damages, conduct research on seismic design method of tunnel construction is gradually being academic attention, and it is reach a consensus that the tunnel buried depth has obvious effects on the seismic performance. However, the current seismic design specifications of highway tunnels still using static analysis methods as the basis for dividing the tunnel buried depth, it is difficult to fully reflect the dynamic characteristics of the earthquake occurred, and the seismic parameters and formulas in different depths of the tunnel need to be revised.The rapid development of computer and numerical simulation software had provided an approach to solve these problems, and a variety of algorithms have been proposed, however, due to the different kinds of software principles, plus a variety of other factors that often lead to significant differences existence in the results of the different models or computational methods derived from the same project, and difficult to determine right and wrong. The model test is an effective means of solving this problem, this study aims to adopt the fluctuation theory, by shaking table test, analysis of seismic response of different depths of the tunnel lining, understand the relationship between the lining’s force and its depth in order to calculate the accuracy of the results of testing the theory, provides a reference to improve model and division method of tunnels’ buried depth under the dynamic action, and then provide the basis for seismic design guidelines.According to the characteristics of this test, based on the analysis of the similarity theory, developed test model similar ratio; by comparing the various types of model box, established the model box’s reasonable approach in the form of construction, design layout and boundary conditions; by reasoning for similar test model materials, obtained the model of rock model, tunnel lining’s similar material and proportion; by exploring the test’s objective conditions, determined the arrangement of principles and position for model test sensor, worked out a set of effective plan for assembly, filling, applied for, laid of model box, rock, lining, sensors on vibrating table. Eventually, implemented shaking table test for lining model at different buried depths in the role of a total of21kinds of working in three seismic waves conditions. Got to some test data represented acceleration process, lining model structure strain soil and rock dynamic stress, so respectively obtained acceleration amplification factor, structural stress of tunnel lining model at different buried depths, and stress variation of rock etc. By the analysis of this part data, some data’s mutations occured with the lining model’s buried depth changes, which provides a reference for division the depth of the buried tunnel power.