Stress-strain state of CFRD with a decrease in friction at the face-sidewall contact
Friction forces arise at the contact between a concrete face and a rockfill dam body at deformations caused by hydrostatic pressure. They cause tensile and compressive longitudinal forces in the face which decrease the safety factor. In modern CFRD, a layer of emulsified asphalt is placed at the con...
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| Format: | Article |
| Language: | English |
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Peter the Great St. Petersburg Polytechnic University
2022-11-01
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| Series: | Magazine of Civil Engineering |
| Subjects: | |
| Online Access: | http://engstroy.spbstu.ru/article/2022.115.06/ |
| _version_ | 1811303466539155456 |
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| author | Sainov Mikhail |
| author_facet | Sainov Mikhail |
| author_sort | Sainov Mikhail |
| collection | DOAJ |
| description | Friction forces arise at the contact between a concrete face and a rockfill dam body at deformations caused by hydrostatic pressure. They cause tensile and compressive longitudinal forces in the face which decrease the safety factor. In modern CFRD, a layer of emulsified asphalt is placed at the contact between the face and the sidewall made of low cement concrete to decrease the friction. Tests carried out in China permit determining shear characteristics of such a contact. They revealed the effect of increasing tangential stiffness with growth of compressive pressure. At high pressures the contact stiffness may reach 200÷500 MPa/m. The author refined the relationship describing the effect of increasing tangential stiffness and determined its parameters. Availability of the data on tangential stiffness and strength of the contact permitted the author to make a more precise model of the concrete face stress-strain state by the finite element method. The results of analyses showed that measures on decreasing the contact friction do not reach the required effect: considerable tensile longitudinal forces appear in the face. The contact tangential stiffness should be more decreased. Tentatively it may be recommended that in a 100m high dam to provide the face tensile strength the contact tangential stiffness should not exceed 50 MPa/m. However, for more justified conclusion it is necessary to carry out additional experimental studies of shear characteristics of the contact between face and the sidewall; and they should be conducted for conditions of very low shear rates typical for real dams. |
| first_indexed | 2024-04-13T07:48:34Z |
| format | Article |
| id | doaj.art-db6646b15ebb4147af0c10dc0fbeef54 |
| institution | Directory Open Access Journal |
| issn | 2712-8172 |
| language | English |
| last_indexed | 2024-04-13T07:48:34Z |
| publishDate | 2022-11-01 |
| publisher | Peter the Great St. Petersburg Polytechnic University |
| record_format | Article |
| series | Magazine of Civil Engineering |
| spelling | doaj.art-db6646b15ebb4147af0c10dc0fbeef542022-12-22T02:55:37ZengPeter the Great St. Petersburg Polytechnic UniversityMagazine of Civil Engineering2712-81722022-11-011150710.34910/MCE.115.620714726Stress-strain state of CFRD with a decrease in friction at the face-sidewall contactSainov Mikhail0https://orcid.org/0000-0003-1139-3164National Research Moscow State Civil Engineering UniversityFriction forces arise at the contact between a concrete face and a rockfill dam body at deformations caused by hydrostatic pressure. They cause tensile and compressive longitudinal forces in the face which decrease the safety factor. In modern CFRD, a layer of emulsified asphalt is placed at the contact between the face and the sidewall made of low cement concrete to decrease the friction. Tests carried out in China permit determining shear characteristics of such a contact. They revealed the effect of increasing tangential stiffness with growth of compressive pressure. At high pressures the contact stiffness may reach 200÷500 MPa/m. The author refined the relationship describing the effect of increasing tangential stiffness and determined its parameters. Availability of the data on tangential stiffness and strength of the contact permitted the author to make a more precise model of the concrete face stress-strain state by the finite element method. The results of analyses showed that measures on decreasing the contact friction do not reach the required effect: considerable tensile longitudinal forces appear in the face. The contact tangential stiffness should be more decreased. Tentatively it may be recommended that in a 100m high dam to provide the face tensile strength the contact tangential stiffness should not exceed 50 MPa/m. However, for more justified conclusion it is necessary to carry out additional experimental studies of shear characteristics of the contact between face and the sidewall; and they should be conducted for conditions of very low shear rates typical for real dams.http://engstroy.spbstu.ru/article/2022.115.06/damscurbsshear stressfrictionfinite element methodinterfaces (materials)strainconcrete faced rockfill dam (cfrd) |
| spellingShingle | Sainov Mikhail Stress-strain state of CFRD with a decrease in friction at the face-sidewall contact Magazine of Civil Engineering dams curbs shear stress friction finite element method interfaces (materials) strain concrete faced rockfill dam (cfrd) |
| title | Stress-strain state of CFRD with a decrease in friction at the face-sidewall contact |
| title_full | Stress-strain state of CFRD with a decrease in friction at the face-sidewall contact |
| title_fullStr | Stress-strain state of CFRD with a decrease in friction at the face-sidewall contact |
| title_full_unstemmed | Stress-strain state of CFRD with a decrease in friction at the face-sidewall contact |
| title_short | Stress-strain state of CFRD with a decrease in friction at the face-sidewall contact |
| title_sort | stress strain state of cfrd with a decrease in friction at the face sidewall contact |
| topic | dams curbs shear stress friction finite element method interfaces (materials) strain concrete faced rockfill dam (cfrd) |
| url | http://engstroy.spbstu.ru/article/2022.115.06/ |
| work_keys_str_mv | AT sainovmikhail stressstrainstateofcfrdwithadecreaseinfrictionatthefacesidewallcontact |