Device for testing coupling function of multi-physics field of core rock and use method of device

Abstract

The invention discloses a device for testing a coupling function of a multi-physics field of core rock and a use method of the device. The device is a sealed barrel body which is composed of a top cover, a barrel body and a base disc; a column chamber and a temperature sensor are arranged in the device; a plunger is installed inside the column chamber; a pressure groove is arranged inside the barrel body; an airbag and a convex rubber piston are arranged inside the pressure groove; the airbag is connected with an external high pressure gas source; a gas pipeline for filling gas to the barrel body is arranged in the plunger; an acoustic emission sensor is installed inside the rubber piston; the acoustic emission sensor is connected with an external acoustic emission acquiring system; a gas discharge port is arranged on the base disc and is connected with a gas pressure difference transmitter, a gas mass flowmeter and a gas data acquirer; and electric heating wires are arranged inside the base disc. With the adoption of the device, not only the transformation and the acoustic emission activity of a coal test piece at different temperatures and stress states are recorded in real time, but also the absorption and desorption processes of coal-gas are carried out; and the visual microstructure characteristics of the coal test piece are quantified by using the CT (computed tomography) technology.

Description

technical field [0001] The invention relates to a test device that satisfies changes in rock macro and micro structures, in particular to a test device for the coupling effect of coal and rock multi-physics fields. Background technique [0002] In the process of mining deep coal resources, high in-situ stress, high temperature and high pore pressure in the deep formation are the main factors affecting the safe mining of coal mines, especially the rock mass in the mining area is always affected by the coupling effect of temperature field, seepage field and stress field . The specific performance is that the coal body changes from a three-way stress state to a two-way stress state, and the porosity, permeability, and heat conduction capacity of the coal body change accordingly. At the same time, the coal seam gas will flow to the mining area after excavation, which not only changes the initial pore pressure of the coal seam, but also changes the pore structure of the coal sea...

AI Technical Summary

Problems solved by technology

It is not difficult to find that these CT detection devices only consider the static pressure adsorption of gas by coal specimens, and fail to consider the influence of multi-physics coupling on coal structure.

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