نوع مقاله : مقاله پژوهشی
نویسندگان
1 استادیار؛ مجتمع دانشگاهی پدافندغیرعامل، دانشگاه صنعتی مالک اشتر
2 دانش آموخته کارشناسی ارشد؛ عمران-زلزله، دانشگاه بین المللی امام خمینی(ره)
چکیده
کلیدواژهها
عنوان مقاله [English]
نویسندگان [English]
Today, the importance of using Underground structures to protect vital and sensitive national infrastructure such as urban train tunnels, strategic item storage centers, urban underground facilities, shelters, as well as military uses is not hidden from anyone. One of these important loads in terms of intensity and time is impact and seismic loading. Due to the fact that the environment around the underground structures is rock and soil environment, so it is necessary to achieve a good result in reducing the effect of mechanical waves on these spaces, to ensure sufficient reduction of the environment. One of these important loads in terms of intensity and time is impact and seismic loading. On the other hand, natural phenomena such as gas explosion or fire can also be easily incorporated into the structure. These are enough reasons to pay more attention to the science of rebuilding structures against different loads on them. The importance of protecting these spaces increases when they have strategic applications. Therefore, in locating and designing them, it should be noted that they must have sufficient resistance to impact loading In order to achieve a plan that by using the properties of the environment including such spaces, the effect of the impact transmitted in the environment on the underground space can be reduced. Therefore, in the past few years, this software has attracted the attention of many researchers. Finite element modeling and analysis was performed with the commercial software package ABAQUS. The package was selected due to its diverse library of material behavior models and ease of Explicit/Implicit solution procedures. In this paper, impact loading on Underground structures is numerically modeled using the Coupled-Eulerian-Lagrangian (CEL) method in the ABAQUS software. In this regard, modeling of single-layer, two-layer and three-layer soil arrangement, as well as a combination of soil and stone layers, has been done in ABAQUS finite element software. The maximum pressure due to impact load has been compared in different models and finally, by comparing the results of the models used in this study, it shows that the arrangement of the layer in the soils is effective in reducing the maximum pressure due to impact load, So that the maximum amount of shock wave damping is achieved when the rock layer with the highest degree of weathering, or sandy soil (similar to type 2 soil in Regulation TM5-855) is in the closest position to the desired underground space.
کلیدواژهها [English]
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