Visual tri-axial seepage device

Abstract

The invention discloses a visual tri-axial seepage experimental device. A top plate and a base are connected together through bolts arranged vertically in a penetrating mode. Cylindrical propylene glass is arranged between the top plate and the base. A loading rod is vertically arranged in the top plate in a penetrating mode, the lower end of the loading rod stretches into the propylene glass, and the upper end of the loading rod stretches out of the top plate to be connected with a pressure device. A liquid charging and discharging pipeline is arranged in the base, the upper end of the liquid charging and discharging pipeline is communicated with the inner portion of the propylene glass, and the lower end of the liquid charging and discharging pipeline is communicated with a hydraulic system. An air inflation pipe and an air outlet pipe are further arranged in the base, one end of the air inflation pipe and one end of the air outlet pipe both stretch into the propylene glass, the other end of the air inflation pipe is connected with a high-pressure gas cylinder outside the base and the other end of the air outlet pipe is connected with a flow testing device outside the base. By means of the visual tri-axial seepage device, the dynamic destruction process of coal rock in the tri-axial state during gas seepage can be visually observed and recorded and meanwhile, the visual tri-axial seepage device further has the advantages of being high in observation precision, simple in structure, high in suitability and the like.

Description

technical field [0001] The invention relates to an experimental device, in particular to a visual experimental device for deformation and destruction of coal rock in the seepage process in a triaxial state. Background technique [0002] Coal and gas outburst is an extremely complex mine dynamic phenomenon often encountered in coal mine production. Its characteristics such as short outbreak time, unpredictability and large damage seriously affect the efficient and safe production of coal mines and the healthy development of the coal industry. Since the first recorded coal and gas outburst accident in the world, scholars at home and abroad have devoted a lot of work to the research on the mechanism of coal and gas outburst. At present, it is generally recognized that the three aspects of in-situ stress, gas and coal-rock physical and mechanical properties Based on the comprehensive effect hypothesis of the combined effects of these factors, it is believed that coal and gas out...

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Problems solved by technology

[0003] At present, the existing equipment is single for testing the physical and mechanical properties of coal and rock under the action of in-situ stress or the joint action of in-situ stress and gas, the gas seepage flow rate reflects the physical parameters of coal body, and indirectly explains the state process of coal and rock, which cannot be intuitive Observing the failure form of coal and rock mass gas seepage process under stress

All in all, there is still a lack of an effective and reliable visual experimental device at present, which can directly observe the failure form of gas-bearing coal and rock under the action of uniaxial and triaxial stress states.

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