Shale physical model test sample considering stratification microstructure, and preparation method and preparation device thereof

Abstract

The invention discloses a shale physical model test sample considering a stratification microstructure as well as a preparation method and a preparation device thereof. The preparation method of the shale physical model test sample comprises the following steps: plating a low-melting-point coating film outside each filling layer partition plate; inserting a plurality of filling layer partition plates plated with coating films into a sample mold in parallel; pouring a prepared filling layer similar material into the sample mold and performing condensing to obtain a sample initial skeleton; heating the initial skeleton of the sample, melting the low-melting-point coating films, and pulling out the filling layer partition plates from the initial skeleton of the sample; and after the molten low-melting-point coating films in the initial skeleton of the sample are removed, filling the original filling layer partition plates in the initial skeleton of the sample with the prepared fine-layersimilar material, and performing condensation and maintenance to obtain a shale physical model test sample. By utilizing the preparation method, the shale physical model test sample containing the stratification microstructure can be successfully prepared.

Description

technical field [0001] The invention belongs to the technical field of rock and soil experiment simulation, and in particular relates to a shale phantom sample considering bedding microstructure, a preparation method and a preparation device. Background technique [0002] For a long time, similar materials have been widely used in the field of rock and soil experiment simulation technology. For the original rock, which is difficult to sample, by preparing similar materials, researchers can deeply understand the physical and mechanical characteristics of geotechnical engineering, such as mechanical phenomena, stress distribution rules, and failure mechanisms. [0003] In recent years, as my country's shale gas exploration and development has made major breakthroughs in Fuling and other regions, unconventional energy sources such as shale gas have gradually received attention. In order to understand the physical and mechanical properties of shale, the failure mode of fracturi...

AI Technical Summary

Problems solved by technology

However, the existing preparation of shale-like materials has largely ignored the most obvious bedding structure characteristics of shale and the material anisotropy caused by bedding arrays, resulting in the preparation of materials with poor physical and mechanical properties. There is a huge gap with the original rock, and it is difficult to meet the needs of experimental research

[0005] In the existing simulation of shale bedding such as CN110658037A, the bedding structure can only be simulated macroscopically, but it is difficult to simulate every fine layer of the shale bedding structure; and the microscopic structure of the shale bedding often consists of alternating The superimposed fine beds and packing layers appear continuously, and the filling and cementation state of each fine bed and packing layer is the decisive factor affecting the anisotropic characteristics of shale; however, since the thickness of fine beds and packing beds is usually small, Usually less than 1mm, the thickest is several millimeters to several centimeters, which cannot be prepared by the preparation method such as CN110658037A

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