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Fengqiang Gong obtained his BSc and MSc from Central South University (CSU), China, and PhD from CSU and Swiss Federal Institute of Technology in Lausanne (EPFL). He is a professor in School of Civil Engineering at Southeast University (SEU), a part-time professor at Hunan University of Science and Technology, and a guest professor at International Joint Research Laboratory of Henan Province for Underground Space Development and Disaster Prevention, China. His current research interests include failure mechanism of rockburst and spalling, rock energy storage law and application, rock dynamics, strength-weakening mechanism of deep rock, and damage constitutive model. He is a member of the editorial boards of Geomechanics and Geophysics for Geo-Energy and Geo-Resources, Journal of Central South University, Acta Geophysica, Chinese Journal of Rock Mechanics and Engineering, Journal of Mining and Strata Control Engineering, Journal of Engineering Geology and Nonferrous Metals (Mining Section).
Outline
The strain energy storage index (WET) is a crucial index for evaluating rockburst proneness. Interestingly, when conducting tests to obtain WET, variations exist in the shape of coal or rock specimens. However, whether shape factors affect WET has not been theoretically and experimentally verified. In this study, to investigate the independence of WET from specimen shape effects, its rationality was first theoretically derived based on the linear energy storage (LES) laws of rock, indicating that WET is influenced by the energy storage coefficient (ESC) of the rock. Two typical rock materials (granite and red sandstone) with different rockburst proneness were selected to verify the migration effect of cubic and cylindrical specimens on WET via uniaxial compression tests. The experimental results revealed that the mechanical behavior characteristics of rocks were affected by the shape of cylindrical and cubic specimens, whereas the WET and ESC were opposite. Furthermore, the practical WET values closely approximate the theoretical values of energy storage-dissipated ratio predicted by the LES law, converging to the peak-strength strain energy storage index (). Based on the LES law, the influence of specimen shape on WET and
was further discussed, concluding that WET and
are independent of specimen shape effects. Furthermore, the
is more stable than WET and reflects the relative magnitude of energy storage and dissipation during the entire pre-peak of rock. Thus, the peak-strength strain energy storage index can be used as a substitute for WET in evaluating the rockburst proneness of rock.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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