Testing device and method for electrical characteristics of rock sample in multi-field coupling state

Abstract

The invention discloses a testing device for the electrical characteristics of a rock sample in a multi-field coupling state. The testing device comprises a resistivity test module, a stress test module, a seepage test module, an upper test probe and a lower test probe. The resistivity test module comprises a direct-current electric method instrument and a plurality of annular electrodes wound around the rock sample to be tested in a layered mode, and the annular electrodes are connected to the direct-current electric method instrument through a direct-current electric method instrument optical cable. Insulating protection layers are arranged on the upper end face and the lower end face of the rock sample to be tested respectively, gaps into which the upper test probe and the lower test probe stretch respectively are formed in the insulating protection layers respectively, and insulating fixing plates are arranged on the outer circumferential surface of the rock sample to be tested. The stress test module comprises a pressure device and a stress sampling device. The seepage test module comprises a high-pressure water inlet system which is communicated with a water inlet hole in the upper test probe, a water outlet is formed in the lower test probe, and a water flow meter is arranged in the water outlet. The invention further discloses a testing method using the testing device. The testing device is simple in structure and convenient to operate.

Description

technical field [0001] The invention relates to a rock sample electrical characteristic testing device, in particular to a rock sample electrical characteristic testing device and a testing method in a stress-seepage state. Background technique [0002] After more than half a century of mining in North China-type coalfields dominated by the Carboniferous-Permian system, the mining depth has entered the deep part, and the working face is deeply threatened by high confined water and thin water-resisting layers, and water inrush from the floor of the working face occurs from time to time . Water inrush mechanisms based on high confined water and thin aquifers emerge in endlessly. However, most of the water inrush mechanisms are only based on a single influencing factor and an ideal model, which is far from the actual water inrush scene on the bottom of the working face. How to accurately detect the occurrence state and migration law of the floor water regime in the working fac...

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Problems solved by technology

The test method of rock long-term multi-field coupling experiment with controllable seepage pressure and phase ratio is a test method based on the above-mentioned experimental device. This patent is mainly used to study rock specimens under the action of mixed fluid in different phases. The thermo-fluid-solid coupling creep experiment of the present invention is all different from the nature and purpose of the research rock of the present invention, therefore, has no connection with the present invention

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