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Outline
In order to study the influence of prefabricated fracture length on the tensile properties and fracture deformation characteristics of different rock materials, notched semi-circular bend (NSCB) specimens of three typical brittle rocks, including granite, medium sandstone and limestone, were selected for loading tests. The deformation of the specimen during failure was monitored by digital image correlation (DIC). The results show that the fracture toughness of rock specimens is positively correlated with mechanical parameters such as compressive strength, tensile strength and elastic modulus, and the bearing capacity of NSCB specimen is negatively correlated with the length of existing cracks. When the fracture length exceeds a certain value(a≥3 mm), the bearing capacity of NSCB specimen has a negative exponential relationship with the fracture length. The deformation characteristics of NSCB specimens are significantly affected by the crystal structure and micro-crack distribution of rock. The higher the degree of cementation of rock minerals, the denser the rock crystal structure, the less developed the micro-cracks, the higher the fracture initiation stress, and the smaller the deformation degree before failure, and vice versa. The research results can provide a basis for further understanding the fracture propagation mechanism of rock materials and predicting its expansion range.
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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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