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Stabilitet hos j�rnv�g p� h�ga bankar � Inriktning mot modellering av bankfyllning genom diskret elementmodellering (DEM)

项目名称：	Stabilitet hos j�rnv�g p� h�ga bankar � Inriktning mot modellering av bankfyllning genom diskret elementmodellering (DEM)
摘要：	The main objective of the project is to study the way in which high railway banks operate through DEM. In particular, it is planned to study the impact of the bank's high speed train and the impact of higher axle loads on Malmbanan, Sweden. In the case of high-speed rail, it becomes important to be able to predict the functionality of the bank material during the use stage. The Bank's packing in construction phase together with degradation in the use phase is also believed to have a major impact on infrastructure settlements. Capacity increase of 30 tonnes to 40 tonnes in Malmbanan is believed to have a major impact on settlements and bankruptcy decomposition, which may cause further settlements, especially at high banks. The project aims to increase knowledge of the transmission of force within the skeletal structure and its impact on the mechanical behavior of the material, e.g. Resistance to permanent deformations or stiffness depending on the bank's height and external loads. In addition, any effects of degradation should be studied. In this application the proposed work connects to and builds on completed work to the technology licentiate degree on modeling of ballast in the transport infrastructure [4]. The application covers work from licentiate to doctorate. The continuation project that this project application covers primarily aims to further develop and implement, using DEM, developed modeling and analysis tools to new challenges, which are the construction of high-speed railways and increase of load capacity at Malmbanan, both of which are on banks. A solid empirical foundation in the form of literature studies is also important in this work, both for the benefit of results obtained and for validation of developed discrete element models. The project comprises a number of parts as follows: * High-speed railroad on the bank: 1. Literature study on empirical trials and modeling of ballast in triaxial trials and banks. These are supplemented by a literature study on ballast degradation. 2. Discrete element modeling of ballast in triaxial trials under repeated load for different radial voltage states incl. possible impact of material degradation. 3. Discrete element modeling of banks with varying heights and gaskets. 4. Analysis of the effect of the bank's height and gasket on macromekanical mode of action. 5. Comparison with published laboratory trials. 6. Micromechanical explanatory models of particle-level action based on DEM: power transmission and possibly. the role of degradation. 4 (6) * Higher demands on cargo capacity in Malmbanan on bank: 1. Supplementary literature study on the effect of stress level on deformations. 2. Discrete element modeling of ballast in triaxial trials under repeated load for various radial and axial stress states incl. possible impact of material degradation. 3. Discrete element modeling of banks with varying heights and packing at varying axle loads. 4. Analysis of the effect of the bank's height and packing on macro-mechanic operation at different axle loads. 5. Comparison with published laboratory trials. 6. Micromechanical explanatory models of particle-level action based on DEM: power transmission and possibly. the role of degradation. Expected outcome of the project is to provide a bank modeling tool that can explain the effect of the bank's height under repeated load (traffic burden) on the bank's macro-mechanical mode of operation for the highway highway special case. The work is expected to identify possibly. level of impact of the bank's packing in the construction phase together with degradation in the use phase. The tool will also be adapted to investigate the impact on high banks of capacity increase from 30 to 40 tonnes on Malmbanan. The results obtained contribute to the development of knowledge for guidance on future empirical attempts and the development of constructions that meet the functional requirements that will be put in the future, benefiting all players in railway construction.
资金：	0.00
资助组织：	Trafikverket, Sweden
项目负责人：	Frias Lopez, Ricardo
执行机构：	Kungliga tekniska h�gskolan
开始时间：	20170901
预计完成日期：	20191231
实际结束时间：	0