Visual servo-loading seepage test method for cracked coal and rock sample

Abstract

The invention discloses a visual servo-loading seepage test method for a cracked coal and rock sample, aims to test pore structure change and seepage evolution characteristics of the cracked coal androckmass compaction process in a coal mining goaf and can construct the pore structure of the cracked coal and rockmass. The test method is characterized in that 1), according to an experimental design scheme, the crushed coal and rock sample with suitable particle sizes is selected and placed in a visual transparent kettle; (2), the compaction stress of a collapse zone in the goaf is measured, and a laboratory loading and unloading stress path of the cracked coal and rock sample is designed; (3), according to the designed loading and unloading stress path, the cracked coal and rock sample isloaded; (4), in the stress loading process, the gas or liquid permeability test is performed by an automatic gas-liquid seepage system when the specified stress is increased each time; and (5), in theloading process, CT scanning is performed when the compaction stress reaches the specified stress. The test method is advantaged in that the pore structure change and the seepage evolution characteristics of the cracked coal and rockmass compaction process in the goaf are obtained.

Description

technical field [0001] The invention relates to testing equipment and methods for the pore structure and seepage characteristics of broken coal and rock mass during the compaction process of the caving zone of the coal seam airtight goaf, in particular to a method for measuring the stress-breaking-seepage coupling characteristics of broken coal and rock samples, In particular, it is a visual servo loading seepage test method for broken coal rock samples. Background technique [0002] During coal seam mining, the overlying strata can generally be divided into "three zones", which are the caving zone, the penetrating fracture zone, and the curved lower layer zone from bottom to top (the curved subsidence zone generally includes a layer-separated fracture zone and a bending deformation zone). The goaf caving zone is generally the rock stratum zone where the overlying rock stratum is damaged and collapses to the goaf caused by mining, also known as the caving zone, and its poros...

AI Technical Summary

Problems solved by technology

However, the goaf caving zone is generally in a closed state because it contains a large amount of toxic and harmful gases and water resources, and it is difficult to measure the pore structure and permeability of the caving zone during the compaction process.

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