Preparation method of cylindrical columnar jointed rock mass sample containing pores

Abstract

The invention discloses a preparation method of a cylindrical columnar jointed rock mass sample containing pores. The preparation method comprises the following steps: establishing a 3D (three-dimensional) geometrical model by utilizing Revit software according to a geometrical morphology of a partial condensation surface of a columnar jointed rock mass of basalt, an occurrence texture and the size of the cylinder based on a geometric similarity ratio principle; qualitatively and quantitatively describing the quantity, the geometrical shape and the spatial positions of the pores according to different morphological characteristics of a cylindrical surface and importing the model into a 3D printer; respectively putting basalt powder as a cylinder material, volcanic ash as a joint filling material and water soluble paper powder as a pore material into three spraying heads of the 3D printer; simultaneously printing with the three spraying heads, so as to form an initial cylindrical columnar jointed rock mass sample containing pores; performing vacuum saturation on the initial sample, so as to form the columnar jointed rock mass sample containing real pore cavities. According to the sample prepared with the method disclosed by the invention, the structures and the morphologies of different types of pores in the columnar jointed rock mass cylinder can be really reflected.

Description

technical field [0001] The invention belongs to the technical field of rock mechanics and geology, and in particular relates to a method for preparing a columnar jointed rock sample with pores in the column. Background technique [0002] The basalt columnar joint rock mass structure is a kind of primary tension fracture structure, which is found all over the world, and is widely distributed in Yunnan, Jiangsu and Zhejiang provinces of my country. With the implementation of the western development, the columnar joint structure in the dam site of hydropower projects in Southwest my country has become one of the main rock mechanics problems in hydropower engineering. Therefore, the study of the mechanical behavior of intermittent columnar joint rock mass has great theoretical and practical value. [0003] The leading theory of the formation mechanism of basalt columnar joints is the "cooling contraction theory". When the lava surface cools down, many contraction centers are pro...

AI Technical Summary

Problems solved by technology

[0005] However, the current methods for preparing columnar joint rock samples are not complete. At the same time, relevant scholars mainly focus on the preparation methods of columnar joint networks and hidden joints, while ignoring the impact of a large number of pores distributed in the column on the anisotropic mechanical behavior of columnar joint rock mass. At the same time, the connected pores will form a new seepage path, which will affect the hydraulic behavior of columnar joint rock mass, and the above problems are not paid attention to in the field of columnar joint rock mass mechanics.

At the same time, similar materials commonly used to simulate pores or cracks, such as mica, copper, tin, etc., will inevitably increase the strength of the sample during the indoor mechanical test due to friction, and cannot truly affect the impact of pores or cracks on rock mechanics.

In summary, ignoring the existence of pores in the column will not truly reflect the engineering properties of columnar jointed rock mass. How to prepare columnar jointed rock mass samples with real pore cavities has become an important and urgently needed research in the field of rock mechanics testing. topic

Images