A coal-rock multi-field coupling integrated test device based on drilling cuttings method

Abstract

A coal-rock multi-field coupling integrated test device based on the cuttings method, including a true triaxial loading mechanism, a gaseous fluid loading component, a liquid fluid loading component, an exhaust / wastewater discharge recovery component, a temperature signal acquisition component, and a charge signal acquisition components and acoustic emission signal acquisition components; the true three-axis loading mechanism includes a pressure chamber, four sets of horizontal loading cylinders and a combination of vertical loading cylinders, and the piston rod of one set of horizontal loading cylinders is a hollow structure. There is a coal dust conduit, the inner end of the coal dust conduit is provided with a nozzle plug plate, the nozzle plug disk is embedded in the pressure head, the outer end of the coal dust conduit is fixed with a drilling rig, and the drill pipe of the drilling rig is located in the coal dust conduit The present invention has the ability to apply true triaxial loads, and can provide a "three-high" loading environment for coal and rock mass samples, and can monitor and collect stress, acoustic emission, charge and temperature data in real time during the coal cuttings drilling process , and provide theoretical and engineering guidance for the prediction and prevention of deep mine dynamic disasters.

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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