Full
Outline
Among the rock mass weakening technology, gas fracturing is more likely to form complex fracture networks compared with hydraulic fracturing. In order to study the fracture propagation mechanism of gas fracturing in the field of directional fracturing technology, laboratory physical experiments and numerical simulation studies on directional gas fracturing based on the radial guide groove technology were carried out. A preparation method of radial guide groove was proposed, a special sealing fixture was designed to simulate the principle of packer, and the acoustic emission device was used to monitor the gas fracturing process in real time. The experimental results show that the radial guide groove can obviously change the propagation direction of gas fracturing fractures within a certain scale, and the fracture initiation pressure is reduced by about 30% compared with that without guide groove. Under the dynamic loading method of gas fracturing, a unique fracture network of primary fracture and secondary micro-fracture appears, and the fracture width increases by 2-3 times compared with the quasi-static loading method. On this basis, LS-DYNA was used to simulate the dynamic dynamics of transient gas fracturing with or without guide groove. Indicators such as effective plastic strain and von mises stress of the models with and without radial guide grooves were compared and analyzed, and the simulation results are consistent with the laboratory experimental results. The research results can promote the development of directional fracturing technology and rock mass weakening methods for deep hard rocks, and provide technical support for the engineering application of directional gas fracturing technology.
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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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