Test method for coal deformation under seam water injection fracturing influence and mining action

Abstract

The invention discloses a test method for coal deformation under seam water injection fracturing influence and mining action. The test method includes the steps of manufacturing a test device that includes a sealed chamber in U shape and a transparent box, wherein a concave opening of the sealed chamber forms a test piece holding chamber, a front presser plate is provided with a front presser rod,the left, right and rear of the test piece holding chamber are provided with side presser plates, the front end of each side presser plate is provided with an air hole, each side presser plate is provided with a side presser rod, upper presser plates are arranged above an upper pad in front-rear adjacency manner, each upper presser plate is provided with an upper presser rod, and the end of eachupper presser rod is fitted with a spherical ball structure between two clamp plates; preparing coal powder; preparing a coal briquette test piece; mounting the coal briquette test piece and a fracturing pipe; applying triaxial stress; applying gas pressure; carrying out water injection fracturing; carrying out testing; carrying out other tests in the same group, and changing coal briquette test pieces with different permeabilities and strengths, and changing the water injection rate of the fracturing pipe; sorting test data. Therefore, triaxial true simulation test for coal deformation underseam water injection fracturing and mining actions.

Description

technical field [0001] The invention belongs to the technical field of coal mine safety and energy exploitation, and in particular relates to a coal body deformation test method under the influence of coal seam water injection and fracturing. Background technique [0002] Energy is the foundation and driving force of modernization, and energy supply and security are related to the overall situation of my country's modernization drive. In the national "Energy Development Strategic Action Plan (2014-2020)", it is pointed out that the production increase and clean and efficient utilization of conventional fossil fuels should be accelerated. In 2019, total coal consumption will be controlled at about 4.2 billion tons, shale gas production will strive to exceed 30 billion cubic meters, and coalbed methane production will strive to reach 30 billion cubic meters. [0003] In the development of conventional fossil fuels and unconventional oil and gas resources, in order to take int...

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Problems solved by technology

[0004] At present, domestic and foreign scholars focus on the field of coal deformation under the influence of coal seam water injection and fracturing, and there are few laboratory tests and theoretical studies. There is still a lack of an effective test device a

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