High-gravity true triaxial rock loading experiment device and method

Abstract

The invention discloses a super-gravity true-triaxial rock loading experimental device and method. The device comprises a control center, a ground oil source, a centrifuge, a true-triaxial loading test device and a counterweight block; the true-triaxial loading test device comprises a bottom plate, a three-axis chamber, a three-axis chamber top cover, an axial principal stress loading device, twolateral principal stress loading devices, two transparent reaction force observation devices and an underground cavern surrounding rock sample. According to the super-gravity true-triaxial rock loading experimental device and method of the present invention, a 1 / N-times underground cavern surrounding rock model experiment is performed in an N-times supergravity environment, and therefore, the similarity of the model experiment is greatly improved; and the transparent reaction plates are used to directly observe deformations and cracks on the side surface of the sample through an image. Compared with a traditional surface bond strain gauge and displacement sensor single-point measurement method, the method of the invention has the advantages of greatly increased monitoring density, greatlyreduced cost, and greatly reduced coordination difficulty. The circular three-axis chamber is adopted to provide a reaction force, and therefore, the circular three-axis chamber is more reasonable than a traditional true-triaxial bracket structure; and with the same confining pressure provided, materials and centrifuge load can be greatly saved.

Description

technical field [0001] The invention belongs to the field of rock mechanics experiments, and in particular relates to a supergravity true triaxial rock loading experiment device and method. Background technique [0002] Development of deep resources, deep storage of oil and gas, geological storage of carbon dioxide, and geological disposal of high-level radioactive waste have become important scientific research directions in the construction of research facilities for underground energy mining, storage, and deep disposal of radioactive waste in my country. For the study of these problems, it is necessary to explore the catastrophic laws of surrounding rocks in deep space. At present, for the evaluation of surrounding rock catastrophe in deep space, the basic mechanical properties + numerical simulation are mostly studied through the loading experiment of unit rock test blocks. Due to the existence of self-gravity stress, there is a large stress gradient in the surrounding ...

AI Technical Summary

Problems solved by technology

However, both strain gauges and displacement gauges are single-point measurements, and it is difficult to provide a large amount of data required for model experiments; and acoustic emission technology is demanding and expensive, and the accuracy of crack identification is limited

Images