Coal and rock mass multi-field coupling integrated testing device based on drilling bit method

Abstract

The invention provides a coal and rock mass multi-field coupling integrated testing device based on a drilling bit method. The device comprises a true triaxial loading mechanism, a gas fluid loading assembly, a liquid fluid loading assembly, a tail gas / wastewater emission recycling assembly, a temperature signal collecting assembly, an electric charge signal collecting assembly and an acoustic emission signal collecting assembly; the true triaxial loading mechanism comprises a pressure chamber, four sets of horizontal loading cylinders and a vertical loading combined cylinder, wherein a pistonrod of one set of horizontal loading cylinders is of a hollow structure. Coal slag guiding pipes are arranged in a central cavity of the piston rods, the inner ends of the coal slag guiding pipes areprovided with pipe opening plug discs, the pipe opening plug discs are embedded in pressing heads, drilling machines are fixedly installed at the outer ends of the coal slag guiding pipes, and drilling rods of the drilling machines are located in the coal slag guiding pipes. The device has the ability to applying true triaxial load, can provide a 'three-high' loading environment for a coal and rock mass sample, can monitor and collect the stress, the acoustic emission, the electric charge and the temperature data in real time in the coal slag drilling process, and provides theoretical and engineering guidance for dynamic disaster prediction and prevention in deep mines.

Description

technical field [0001] The invention belongs to the technical field of coal mine safety, in particular to a multi-field coupling integrated test device for coal and rock mass based on the cuttings method. Background technique [0002] At this stage, coal mining has gradually entered the stage of deep mining. Deep coal rocks have been under the coupling effect of multiple fields, and water, gas, and temperature have fundamentally changed the organizational structure and mechanical behavior characteristics of deep coal rocks. The environment presents the characteristics of "three highs" of high ground stress, high osmotic pressure and high ground temperature, which lead to frequent disasters and accidents such as rock burst, coal and gas outburst in deep mining. Therefore, it is necessary to study and explore the mechanical properties, deformation characteristics and disaster-causing mechanism of deep coal rocks under the coupling of multiple fields. [0003] At present, the ...

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Problems solved by technology

However, when the drilling cuttings method is applied to indoor experiments, due to limited conditions, most of them can only achieve conventional triaxial tests in a gas-free and normal temperature environment, and cannot monitor various parameters in the process of deformation and failure of coal rocks. Simulating the loading environment of deep coal and rock in the "three high" state and predicting disasters based on precursor parameter information, the experimental results have little guiding significance for the field

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