3D printing-based layered prefabricated defect coal and rock mass sample preparation device and method

Abstract

The invention provides a 3D printing-based layered prefabricated defect coal and rock mass sample preparation device and method. The method comprises the following steps: structural parameters of underground coal measure strata coal and rock mass are collected on site, a digital strata model is established, a reasonable similarity material ratio is selected, a concrete material is prepared, a 3D printing technology is used to print and prepare a complex layered structural rock mass model, maintenance is carried out, after the maintenance is completed, the integral model is taken out, coring iscarried out on a specially-made coring machine with an adjustable base, machining and grinding are carried out on the coring machine, and finally the layered prefabricated defect coal and rock mass sample is obtained. According to the device and the method in the invention, various geological structures such as various joints, fractures, bedding, faults and the like contained in the underground engineering strata can be restored and simulated accurately, the attitude of the coal measure strata can be accurately reproduced; and the coal and rock mass sample is provided, thereby facilitating the mechanical behavioral research of the coal and rock mass with the complex layered structure.

Description

technical field [0001] The invention relates to a method for preparing layered prefabricated defective coal and rock mass samples based on 3D printing technology, which is especially suitable for preparing coal measure strata samples in the field of underground coal mining, and belongs to the field of rock mass mechanics. Background technique [0002] Layered rock mass is the result of rocks being deposited and compacted in a certain order after mineral extrusion, dehydration, recrystallization, cementation, etc. during the diagenesis process, and its structure is mostly layered or plate-like. Due to the complexity of layered coal rock materials in the long process of formation and the influence of multi-phase tectonic movements of coal rock itself, macroscopic structural planes such as bedding, joints, and schistoses, and microscopic defects such as microcracks and cavities are relatively developed, making The physical and mechanical behavior of coal and rock materials is e...

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Problems solved by technology

The traditional research on the mechanical properties of coal and rock is mainly carried out by drilling the core of coal and rock samples for rock mechanical experiments. Due to the research on the mechanical properties of coal and rock mass carried out by using on-site coring, the sample size is small, the selection range is small, and the interface is damaged. Many limitations such as non-adjustable inclination angles cannot truly reflect the internal defects of undergroun

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