Mechanism of Strain Burst by Laboratory and Numerical Analysis
Strain burst is often considered to be a type of failure related to brittle rock material; therefore, many studies on strain burst focus on the brittleness of rock. However, the laboratory experiments show that strain burst can not only occur in hard brittle rock-like granite but also in the relativ...
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| Format: | Article |
| Language: | English |
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Wiley
2018-01-01
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| Series: | Shock and Vibration |
| Online Access: | http://dx.doi.org/10.1155/2018/8940798 |
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| _version_ | 1832550600610414592 |
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| author | Manchao He Fuqiang Ren Cheng Cheng |
| author_facet | Manchao He Fuqiang Ren Cheng Cheng |
| author_sort | Manchao He |
| collection | DOAJ |
| description | Strain burst is often considered to be a type of failure related to brittle rock material; therefore, many studies on strain burst focus on the brittleness of rock. However, the laboratory experiments show that strain burst can not only occur in hard brittle rock-like granite but also in the relatively ductile rock-like argillaceous sandstone. This result proves that behavior of rock material is not the only factor influencing the occurrence of strain burst. What must also be considered is the relative stiffness between the excavation wall/ore body and the surrounding rock mass. In order to further studying the mechanism of strain burst considering the whole system, the engineering geomechanial model and numerical model of strain burst due to excavation are built, respectively. In a series of numerical tests, the rock mass involving the excavation wall as well as roof and floor is biaxially loaded to the in situ stress state before one side of the excavation wall is unloaded abruptly to simulate the excavation in the field. With various system stiffness determined by the microproperties including the contact moduli of particles and parallel bond moduli in the models of roof and floor, the different failure characteristics are obtained. Based on the failure phenomenon, deformation, and released energy from the roof and floor, this study proves that the system stiffness is a key factor determining the violence of the failure, and strain burst is prone to happen when the system is soft. Two critical Young’s moduli ratios and stiffness ratios are identified to assess the violence of failure. |
| format | Article |
| id | doaj-art-01364159e6e1408ab8e7bb3a9ebc28a0 |
| institution | Kabale University |
| issn | 1070-9622 1875-9203 |
| language | English |
| publishDate | 2018-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Shock and Vibration |
| spelling | doaj-art-01364159e6e1408ab8e7bb3a9ebc28a02025-02-03T06:06:17ZengWileyShock and Vibration1070-96221875-92032018-01-01201810.1155/2018/89407988940798Mechanism of Strain Burst by Laboratory and Numerical AnalysisManchao He0Fuqiang Ren1Cheng Cheng2State Key Laboratory for Geomechanics & Deep Underground Engineering, Beijing 100083, ChinaState Key Laboratory for Geomechanics & Deep Underground Engineering, Beijing 100083, ChinaInstitute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, ChinaStrain burst is often considered to be a type of failure related to brittle rock material; therefore, many studies on strain burst focus on the brittleness of rock. However, the laboratory experiments show that strain burst can not only occur in hard brittle rock-like granite but also in the relatively ductile rock-like argillaceous sandstone. This result proves that behavior of rock material is not the only factor influencing the occurrence of strain burst. What must also be considered is the relative stiffness between the excavation wall/ore body and the surrounding rock mass. In order to further studying the mechanism of strain burst considering the whole system, the engineering geomechanial model and numerical model of strain burst due to excavation are built, respectively. In a series of numerical tests, the rock mass involving the excavation wall as well as roof and floor is biaxially loaded to the in situ stress state before one side of the excavation wall is unloaded abruptly to simulate the excavation in the field. With various system stiffness determined by the microproperties including the contact moduli of particles and parallel bond moduli in the models of roof and floor, the different failure characteristics are obtained. Based on the failure phenomenon, deformation, and released energy from the roof and floor, this study proves that the system stiffness is a key factor determining the violence of the failure, and strain burst is prone to happen when the system is soft. Two critical Young’s moduli ratios and stiffness ratios are identified to assess the violence of failure.http://dx.doi.org/10.1155/2018/8940798 |
| spellingShingle | Manchao He Fuqiang Ren Cheng Cheng Mechanism of Strain Burst by Laboratory and Numerical Analysis Shock and Vibration |
| title | Mechanism of Strain Burst by Laboratory and Numerical Analysis |
| title_full | Mechanism of Strain Burst by Laboratory and Numerical Analysis |
| title_fullStr | Mechanism of Strain Burst by Laboratory and Numerical Analysis |
| title_full_unstemmed | Mechanism of Strain Burst by Laboratory and Numerical Analysis |
| title_short | Mechanism of Strain Burst by Laboratory and Numerical Analysis |
| title_sort | mechanism of strain burst by laboratory and numerical analysis |
| url | http://dx.doi.org/10.1155/2018/8940798 |
| work_keys_str_mv | AT manchaohe mechanismofstrainburstbylaboratoryandnumericalanalysis AT fuqiangren mechanismofstrainburstbylaboratoryandnumericalanalysis AT chengcheng mechanismofstrainburstbylaboratoryandnumericalanalysis |