Energy Evolution and Mechanical Features of Granite Subjected to Triaxial Loading-Unloading Cycles
Energy evolution varies during the whole process of rock deformation, and mechanical parameters are markedly altered under cyclic loading and unloading. In order to investigate the effects of confining pressure on energy evolution and mechanical parameters, cyclic loading and unloading experiments w...
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| Format: | Article |
| Language: | English |
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Wiley
2019-01-01
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| Series: | Advances in Civil Engineering |
| Online Access: | http://dx.doi.org/10.1155/2019/9871424 |
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| author | Feng Pei Hongguang Ji Tongzhao Zhang |
| author_facet | Feng Pei Hongguang Ji Tongzhao Zhang |
| author_sort | Feng Pei |
| collection | DOAJ |
| description | Energy evolution varies during the whole process of rock deformation, and mechanical parameters are markedly altered under cyclic loading and unloading. In order to investigate the effects of confining pressure on energy evolution and mechanical parameters, cyclic loading and unloading experiments were performed for granite under six different confining pressures. The experiment revealed the confining pressure effect on variation and allocation pattern of energy and mechanical characteristics. Four characteristic energy parameters, namely, storage energy rock, storage energy limit, energy storage ratio, and energy dissipation ratio, were proposed to describe energy storage and dissipation properties of rock. Elastic modulus and dissipation ratio presented a downward “U” and “U”-shaped trends, respectively, with loading and unloading cycles, while Poisson’s ratio increased linearly at the same time. Elastic energy was accumulated mainly before peak stress, while the energy dissipation and release were dominant after the peak strength. As the confining pressure increased, efficiency of energy accumulation and storage limit improved. An exponential function was proposed to express the relationship between the energy storage limit and confining pressure. Dissipation energy increased nonlinearly with the strain, and the volume dilatancy point defined the turning point from a relatively slow growth to an accelerated growth of dissipation energy. The dilatancy point can be used as an important indication for the rapid development of dissipation energy. |
| format | Article |
| id | doaj-art-b64e292903f14c3eac034c690f974d55 |
| institution | Kabale University |
| issn | 1687-8086 1687-8094 |
| language | English |
| publishDate | 2019-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Civil Engineering |
| spelling | doaj-art-b64e292903f14c3eac034c690f974d552025-02-03T06:10:48ZengWileyAdvances in Civil Engineering1687-80861687-80942019-01-01201910.1155/2019/98714249871424Energy Evolution and Mechanical Features of Granite Subjected to Triaxial Loading-Unloading CyclesFeng Pei0Hongguang Ji1Tongzhao Zhang2School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, ChinaSchool of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, ChinaSchool of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, ChinaEnergy evolution varies during the whole process of rock deformation, and mechanical parameters are markedly altered under cyclic loading and unloading. In order to investigate the effects of confining pressure on energy evolution and mechanical parameters, cyclic loading and unloading experiments were performed for granite under six different confining pressures. The experiment revealed the confining pressure effect on variation and allocation pattern of energy and mechanical characteristics. Four characteristic energy parameters, namely, storage energy rock, storage energy limit, energy storage ratio, and energy dissipation ratio, were proposed to describe energy storage and dissipation properties of rock. Elastic modulus and dissipation ratio presented a downward “U” and “U”-shaped trends, respectively, with loading and unloading cycles, while Poisson’s ratio increased linearly at the same time. Elastic energy was accumulated mainly before peak stress, while the energy dissipation and release were dominant after the peak strength. As the confining pressure increased, efficiency of energy accumulation and storage limit improved. An exponential function was proposed to express the relationship between the energy storage limit and confining pressure. Dissipation energy increased nonlinearly with the strain, and the volume dilatancy point defined the turning point from a relatively slow growth to an accelerated growth of dissipation energy. The dilatancy point can be used as an important indication for the rapid development of dissipation energy.http://dx.doi.org/10.1155/2019/9871424 |
| spellingShingle | Feng Pei Hongguang Ji Tongzhao Zhang Energy Evolution and Mechanical Features of Granite Subjected to Triaxial Loading-Unloading Cycles Advances in Civil Engineering |
| title | Energy Evolution and Mechanical Features of Granite Subjected to Triaxial Loading-Unloading Cycles |
| title_full | Energy Evolution and Mechanical Features of Granite Subjected to Triaxial Loading-Unloading Cycles |
| title_fullStr | Energy Evolution and Mechanical Features of Granite Subjected to Triaxial Loading-Unloading Cycles |
| title_full_unstemmed | Energy Evolution and Mechanical Features of Granite Subjected to Triaxial Loading-Unloading Cycles |
| title_short | Energy Evolution and Mechanical Features of Granite Subjected to Triaxial Loading-Unloading Cycles |
| title_sort | energy evolution and mechanical features of granite subjected to triaxial loading unloading cycles |
| url | http://dx.doi.org/10.1155/2019/9871424 |
| work_keys_str_mv | AT fengpei energyevolutionandmechanicalfeaturesofgranitesubjectedtotriaxialloadingunloadingcycles AT hongguangji energyevolutionandmechanicalfeaturesofgranitesubjectedtotriaxialloadingunloadingcycles AT tongzhaozhang energyevolutionandmechanicalfeaturesofgranitesubjectedtotriaxialloadingunloadingcycles |