STRESSED STATE OF ROCKY SUBSOIL IN THE VICINITY OF A CIRCULAR SECTION HYDRAULIC ENGINEERING TUNNEL TAKING INTO ACCOUNT THE ANISOTROPY OF THE GROUND MEDIUM
Objectives. The aim of this study consists ina parametric analysis of the stress state of transversely isotropic rocky ground in the vicinity of a circular cross-sectional hydraulic tunnel taking into account the dead load of the subsoil medium under various relations of the elastic characteristics...
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| Format: | Article |
| Language: | Russian |
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Dagestan State Technical University
2017-03-01
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| Series: | Вестник Дагестанского государственного технического университета: Технические науки |
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| Online Access: | https://vestnik.dgtu.ru/jour/article/view/342 |
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| author | D. T. Bautdinov M. M. Dzhamaludinov |
| author_facet | D. T. Bautdinov M. M. Dzhamaludinov |
| author_sort | D. T. Bautdinov |
| collection | DOAJ |
| description | Objectives. The aim of this study consists ina parametric analysis of the stress state of transversely isotropic rocky ground in the vicinity of a circular cross-sectional hydraulic tunnel taking into account the dead load of the subsoil medium under various relations of the elastic characteristics of the subsoil environment in orthogonal directions and at different angles of inclination of the plane of isotropy. Methods. A transversely isotropic medium model (a special case of an anisotropic medium) is applied, in which the subsoil in one plane has the characteristics of an isotropic medium (isotropic plane) but in a perpendicular direction – in contradistinction to the characteristics of an isotropic medium.The angle of isotropic planar inclination models the oblique bedding of subsoil layers. Results. The determination of tangential stresses on the contour generation allows the strength of the subsoil medium to be estimated at different depths of emplacement. The calculation of extensive hydraulic engineering tunnels, constructed in strong, transversely isotropic rocky ground, is reduced to a problem of plane strain elasticity theory for a transversely isotropic medium surrounding the tunnel construction. Since the solution of this problem cannot be achieved using analytical methods, the analysis of the stress state was carried out by finite element method using the ANSYS software complex. The type and size of the finite element appropriate for the calculation were pre-identified based on solutions to the task of verification. For the verificatory task, the Kirsch problem was adopted. Conclusion.When designing underground structures, it is necessary to determine the physical and mechanical properties of rocky soils in greater detail and to pay special attention to the elastic characteristics. The absence of tensile stresses in the upper section of development with some relations of the moduli of deformation and Poisson's ratios benefit the work of hydraulic tunnelling. At a bedding angle of at least 30º, its impact on the state of stress is insignificant and calculations can be carried out without taking the angle into account, but instead considering the anisotropy of the elastic properties. |
| first_indexed | 2024-03-12T03:04:21Z |
| format | Article |
| id | doaj.art-a45687eeb2454221b0c72857025546f8 |
| institution | Directory Open Access Journal |
| issn | 2073-6185 2542-095X |
| language | Russian |
| last_indexed | 2024-03-12T03:04:21Z |
| publishDate | 2017-03-01 |
| publisher | Dagestan State Technical University |
| record_format | Article |
| series | Вестник Дагестанского государственного технического университета: Технические науки |
| spelling | doaj.art-a45687eeb2454221b0c72857025546f82023-09-03T14:33:09ZrusDagestan State Technical UniversityВестник Дагестанского государственного технического университета: Технические науки2073-61852542-095X2017-03-0143414415210.21822/2073-6185-2016-43-4-144-152318STRESSED STATE OF ROCKY SUBSOIL IN THE VICINITY OF A CIRCULAR SECTION HYDRAULIC ENGINEERING TUNNEL TAKING INTO ACCOUNT THE ANISOTROPY OF THE GROUND MEDIUMD. T. Bautdinov0M. M. Dzhamaludinov1Российский государственный аграрный университет-университет природообустройства МСХА им. К.А. ТимирязеваРеспублика Дагестан «Экосервис»Objectives. The aim of this study consists ina parametric analysis of the stress state of transversely isotropic rocky ground in the vicinity of a circular cross-sectional hydraulic tunnel taking into account the dead load of the subsoil medium under various relations of the elastic characteristics of the subsoil environment in orthogonal directions and at different angles of inclination of the plane of isotropy. Methods. A transversely isotropic medium model (a special case of an anisotropic medium) is applied, in which the subsoil in one plane has the characteristics of an isotropic medium (isotropic plane) but in a perpendicular direction – in contradistinction to the characteristics of an isotropic medium.The angle of isotropic planar inclination models the oblique bedding of subsoil layers. Results. The determination of tangential stresses on the contour generation allows the strength of the subsoil medium to be estimated at different depths of emplacement. The calculation of extensive hydraulic engineering tunnels, constructed in strong, transversely isotropic rocky ground, is reduced to a problem of plane strain elasticity theory for a transversely isotropic medium surrounding the tunnel construction. Since the solution of this problem cannot be achieved using analytical methods, the analysis of the stress state was carried out by finite element method using the ANSYS software complex. The type and size of the finite element appropriate for the calculation were pre-identified based on solutions to the task of verification. For the verificatory task, the Kirsch problem was adopted. Conclusion.When designing underground structures, it is necessary to determine the physical and mechanical properties of rocky soils in greater detail and to pay special attention to the elastic characteristics. The absence of tensile stresses in the upper section of development with some relations of the moduli of deformation and Poisson's ratios benefit the work of hydraulic tunnelling. At a bedding angle of at least 30º, its impact on the state of stress is insignificant and calculations can be carried out without taking the angle into account, but instead considering the anisotropy of the elastic properties.https://vestnik.dgtu.ru/jour/article/view/342модуль деформациикоэффициент пуассонатрансверсальноизотропная средатеория упругости |
| spellingShingle | D. T. Bautdinov M. M. Dzhamaludinov STRESSED STATE OF ROCKY SUBSOIL IN THE VICINITY OF A CIRCULAR SECTION HYDRAULIC ENGINEERING TUNNEL TAKING INTO ACCOUNT THE ANISOTROPY OF THE GROUND MEDIUM Вестник Дагестанского государственного технического университета: Технические науки модуль деформации коэффициент пуассона трансверсальноизотропная среда теория упругости |
| title | STRESSED STATE OF ROCKY SUBSOIL IN THE VICINITY OF A CIRCULAR SECTION HYDRAULIC ENGINEERING TUNNEL TAKING INTO ACCOUNT THE ANISOTROPY OF THE GROUND MEDIUM |
| title_full | STRESSED STATE OF ROCKY SUBSOIL IN THE VICINITY OF A CIRCULAR SECTION HYDRAULIC ENGINEERING TUNNEL TAKING INTO ACCOUNT THE ANISOTROPY OF THE GROUND MEDIUM |
| title_fullStr | STRESSED STATE OF ROCKY SUBSOIL IN THE VICINITY OF A CIRCULAR SECTION HYDRAULIC ENGINEERING TUNNEL TAKING INTO ACCOUNT THE ANISOTROPY OF THE GROUND MEDIUM |
| title_full_unstemmed | STRESSED STATE OF ROCKY SUBSOIL IN THE VICINITY OF A CIRCULAR SECTION HYDRAULIC ENGINEERING TUNNEL TAKING INTO ACCOUNT THE ANISOTROPY OF THE GROUND MEDIUM |
| title_short | STRESSED STATE OF ROCKY SUBSOIL IN THE VICINITY OF A CIRCULAR SECTION HYDRAULIC ENGINEERING TUNNEL TAKING INTO ACCOUNT THE ANISOTROPY OF THE GROUND MEDIUM |
| title_sort | stressed state of rocky subsoil in the vicinity of a circular section hydraulic engineering tunnel taking into account the anisotropy of the ground medium |
| topic | модуль деформации коэффициент пуассона трансверсальноизотропная среда теория упругости |
| url | https://vestnik.dgtu.ru/jour/article/view/342 |
| work_keys_str_mv | AT dtbautdinov stressedstateofrockysubsoilinthevicinityofacircularsectionhydraulicengineeringtunneltakingintoaccounttheanisotropyofthegroundmedium AT mmdzhamaludinov stressedstateofrockysubsoilinthevicinityofacircularsectionhydraulicengineeringtunneltakingintoaccounttheanisotropyofthegroundmedium |