Underground Complex Structural Dynamic Characteristics Of Study

Along with the social economy development, the global resources are short and the environment worsening, the underground spatial development and the use are already raised to the extremely important status, underground project practice also in daily increasing; In order to reduce the detonation, the earthquake as well as other vibration disasters, the underground structure should have the enough anti- dynamic load ability. Based on this, this article has carried on the discussion to the underground composite construction dynamic performance and the underground structure design method, the main content is as follows.1, a brief introduction about the underground project development survey, the underground structure computation theory development , and the underground composite construction system constitution as well as the function for the flexible band in underground composite construction system has been given in this paper. There is also an introduction of the current research situation in the world about the technical path on how to strengthen the underground structure's ability to against explosion and shock and so on. Simultaneously, developments of the technology and necessity of the research have also been discussed briefly in the paper.2, there is a brief introduction of the Hamilton generalized variation theory. Based on the generalized dynamic variation theory on a bend shaft system in elastic media under condition of plane strain, the generalized functional for this system has been procured, which can be used to dispose the problem of the compound round structures with soft backfill layer underground. By the Hamilton generalized variation theory, the lined structure system underground in semi-space in elastic media is analyzed dynamically.3, the underground compound round structure system under the action of shock wave is analyzed dynamically. In this model, Druck-Prager yield criterion in elastic-plastic theory is used for the soft refilled material, and the differential equations for solving the problem are given based on the theory above. Based on the nonlinear oscillation theory, considered the material non-linear factor and the structure and the soil body mutual action mechanism, the suitable finite element model is established.4, based on the finite element model, using the ANSYS finite element program to analysis the dynamic response of the underground composite construction, and carrying on the obtained analysis result and the theory achievement the comparative analysis, a basic rule of the underground composite construction dynamic response is obtained in the paper.