Stiffness and strength of structural layers from cohesionless material
The deformation modulus and permissible stress are two independent parameters that depict the carrying capacity of foundations, including earthworks and ballast layer. Nevertheless, while designing the track superstructure or controlling its state, they are considered separate to each other, even th...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Faculty of Transport, Warsaw University of Technology
2019-03-01
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| Series: | Archives of Transport |
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| Online Access: | http://aot.publisherspanel.com/gicid/01.3001.0013.2776 |
| _version_ | 1818391648524042240 |
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| author | Ulf Gerber Mykola Sysyn Jandab Zarour Olga Nabochenko |
| author_facet | Ulf Gerber Mykola Sysyn Jandab Zarour Olga Nabochenko |
| author_sort | Ulf Gerber |
| collection | DOAJ |
| description | The deformation modulus and permissible stress are two independent parameters that depict the carrying capacity of foundations, including earthworks and ballast layer. Nevertheless, while designing the track superstructure or controlling its state, they are considered separate to each other, even though they are terms of the same measure. The scientific problem is due to the practical necessity of unified building rules and standards. The carrying capacity of earthworks and foundations is regulated with standards based both on deformation and on stress criteria, which are not related to each other. This plays particularly important role for railway ballast layer, as an intermediate between the solids and soil.
The objective of the present research is to estimate the relationship between deformation modulus and the strength of ballast layer. An overview of modern approaches according to the relation between the stiffness, deformation modulus, elasticity and strength of soils and crushed stone is done.
The strength of ballast layer is considered depending on the experimental test: the direct shear test, compressive strength in the uniaxial or biaxial stress state. Load transfer model in crushed stone is proposed. The load transfer angle and cone of loading distribution are determined based on the load transfer and compressive strength models.
The relation between deformation modulus and strength is derived from two simple laboratory experiments with cohesionless ballast material. The experiment tests have shown that the ballast stiffness as well as its strength are influenced with the support stress. The measurement of elastic and residual settlements for the different support stress values enables to determine the relation. It can be potentially used for the development of methods for the ballast compaction control, unification of construction norms. The research result should be considered as an approach for unification of two different ways to reflect the carrying capacity of ballast layer. |
| first_indexed | 2024-12-14T05:16:52Z |
| format | Article |
| id | doaj.art-351637af213d4d7d974bfc36e43f6d85 |
| institution | Directory Open Access Journal |
| issn | 0866-9546 2300-8830 |
| language | English |
| last_indexed | 2024-12-14T05:16:52Z |
| publishDate | 2019-03-01 |
| publisher | Faculty of Transport, Warsaw University of Technology |
| record_format | Article |
| series | Archives of Transport |
| spelling | doaj.art-351637af213d4d7d974bfc36e43f6d852022-12-21T23:15:47ZengFaculty of Transport, Warsaw University of TechnologyArchives of Transport0866-95462300-88302019-03-01491596810.5604/01.3001.0013.277601.3001.0013.2776Stiffness and strength of structural layers from cohesionless materialUlf Gerber0Mykola Sysyn1Jandab Zarour2Olga Nabochenko3Technical University of Dresden, Institute of Railway Systems and Public Transport, Dresden, GermanyTechnical University of Dresden, Institute of Railway Systems and Public Transport, Dresden, GermanyTechnical University of Dresden, Institute of Railway Systems and Public Transport, Dresden, GermanyLviv branch of Dnipropetrovsk National University of Railway Transport, Department of the rolling stock and track, Lviv, UkraineThe deformation modulus and permissible stress are two independent parameters that depict the carrying capacity of foundations, including earthworks and ballast layer. Nevertheless, while designing the track superstructure or controlling its state, they are considered separate to each other, even though they are terms of the same measure. The scientific problem is due to the practical necessity of unified building rules and standards. The carrying capacity of earthworks and foundations is regulated with standards based both on deformation and on stress criteria, which are not related to each other. This plays particularly important role for railway ballast layer, as an intermediate between the solids and soil. The objective of the present research is to estimate the relationship between deformation modulus and the strength of ballast layer. An overview of modern approaches according to the relation between the stiffness, deformation modulus, elasticity and strength of soils and crushed stone is done. The strength of ballast layer is considered depending on the experimental test: the direct shear test, compressive strength in the uniaxial or biaxial stress state. Load transfer model in crushed stone is proposed. The load transfer angle and cone of loading distribution are determined based on the load transfer and compressive strength models. The relation between deformation modulus and strength is derived from two simple laboratory experiments with cohesionless ballast material. The experiment tests have shown that the ballast stiffness as well as its strength are influenced with the support stress. The measurement of elastic and residual settlements for the different support stress values enables to determine the relation. It can be potentially used for the development of methods for the ballast compaction control, unification of construction norms. The research result should be considered as an approach for unification of two different ways to reflect the carrying capacity of ballast layer.http://aot.publisherspanel.com/gicid/01.3001.0013.2776ballast layercrushed stonedeformation modulusstrengthcarrying capacity |
| spellingShingle | Ulf Gerber Mykola Sysyn Jandab Zarour Olga Nabochenko Stiffness and strength of structural layers from cohesionless material Archives of Transport ballast layer crushed stone deformation modulus strength carrying capacity |
| title | Stiffness and strength of structural layers from cohesionless material |
| title_full | Stiffness and strength of structural layers from cohesionless material |
| title_fullStr | Stiffness and strength of structural layers from cohesionless material |
| title_full_unstemmed | Stiffness and strength of structural layers from cohesionless material |
| title_short | Stiffness and strength of structural layers from cohesionless material |
| title_sort | stiffness and strength of structural layers from cohesionless material |
| topic | ballast layer crushed stone deformation modulus strength carrying capacity |
| url | http://aot.publisherspanel.com/gicid/01.3001.0013.2776 |
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