Preparation method of columnar joint specimen with chisel structure for seepage test

Abstract

The invention discloses a method for preparing a gouge mark structure-containing columnar jointing sample for a seepage test. The method comprises measuring a geometrical shape, occurrence, a column diameter, columnar jointing width, a jointing filling degree, and cylindrical surface gouge mark structure stripe width and thickness of the condensing surface of a basalt columnar jointing rock in situ, according to a similarity ratio principle, building a 3D reduced scale geometric model through Revit software, introducing the 3D reduced scale geometric model into a 3D printer, respectively filling two nozzles of the 3D printer with basalt powder as a columnar material and secondary yellow mud as a jointing material, and carrying out synchronous printing to obtain a sample of a gouge mark structure-containing columnar jointing network model, wherein after later processing and curing, the model can be used for a columnar jointing rock seepage test. Through use of the jointing surface gouge mark structure, the sample can really reflect the structure and shape of the gouge mark structure-containing columnar jointing network model and can provide a novel research idea for anisotropic seepage of the columnar jointing.

Description

technical field [0001] The invention relates to a method for preparing a columnar joint sample with gouging marks for seepage tests, and belongs to the interdisciplinary technical field of geology, seepage mechanics, rock mechanics and the like. Background technique [0002] Joints are a kind of geological discontinuities widely distributed in rock mass. The seepage of rock mass is essentially the seepage of discontinuous surface and its network. Therefore, the study of joint seepage characteristics is of great significance to the hydraulic properties of rock mass. In the early research on the seepage characteristics of joints, the joints were assumed to be smooth parallel plates, and the classic cubic law was developed. However, the actual rock joints are not smooth and straight. Relevant scholars in the field of seepage have proposed joint roughness coefficients and channel tortuosity coefficients. A lot of beneficial research has been carried out on joint seepage and joi...

AI Technical Summary

Problems solved by technology

In terms of laboratory test research on columnar jointed rock mass, most of the research is through mixing river sand, cement, gypsum and other materials in different proportions combined with mold casting samples. It is difficult to prepare samples that meet the requirements of the seepage test, because this method is difficult to achieve the same joint width, filling degree and roughness of the prepared samples in terms of joint width control

[0005] To sum up, the research on the seepage theory of joint network is not perfect, and the research on the joint seepage characteristics of columnar joint rock mass is almost blank; the existence of columnar joint chisel structure significantly changes the seepage path, and there are no relevant studies in the existing research results; The sample preparation method with throttling network for seepage test is poor in applicability

Images