Preparation method of columnar joint rock sample with filled pores in columnar surface

Abstract

The invention discloses a preparation method of a columnar joint rock sample with filled pores in a columnar surface. The preparation method comprises the following steps: measuring the cross section geometrical morphology, the rock stratum attitude, the joint gap width and the single columnar surface morphological characteristics of a columnar joint basalt rock, and establishing a three-dimensional model of the columnar joint rock by virtue of Revit software and based on a similarity ratio criteria; according to different single columnar surface morphological characteristics, establishing a statistical analysis form; introducing the three-dimensional geometrical model of the columnar joint rock and statistical analysis data of the columnar surface pores into a 3D printer; taking basalt powder as a column material and secondary yellow mud as a joint and columnar surface pore filling material, charging into double nozzles of the 3D printer respectively, and printing at the same time to form an initial columnar joint rock sample; in the later stage, performing grinding, polishing, leveling and curing to obtain the columnar joint sample meeting requirements of a seepage test. The sample prepared with the preparation method provided by the invention can really reflect the distribution state of the filled columnar surface pores, and can be used for studying the influence of the filled columnar surface pores on seepage characteristics of a columnar joint surface.

Description

technical field [0001] The invention relates to a method for preparing a columnar jointed rock mass sample with filled pores on the column surface, and belongs to the interdisciplinary technical field of rock mass mechanics, geology, seepage mechanics and 3D printing technology. Background technique [0002] Columnar joint is a common primary structure of basalt. Columnar joint rock mass is a special type of engineering geological rock mass. The joint surface is generally a polygonal columnar surface with regular cross-section. Columnar joints are widely distributed in mainland China. A large-scale hydropower station in Southwest China was located in the columnar joint area. With the development of the project, researchers have paid more and more attention to the study of non-linear and anisotropic joint surface seepage in columnar joint rock mass. value, which has become one of the main rock mechanics problems in this hydropower project. [0003] The leading theory of the ...

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Problems solved by technology

[0004] The seepage characteristics of joint surfaces with stomata are difficult to explain with the common roughness theory, and the classical cubic law is even more inapplicable. The applicability of the seepage governing equations Reynolds equation and N-S equation needs further study

[0005] Due to the high cost of the field test, the large dispersion of results, and the difficulty of sampling columnar joints, the blocks are usually large

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