Information acquisition device and method based on real-time damages of rocks

Abstract

The invention provides an information acquisition device and method based on real-time damages of rocks and belongs to the technical field of rock mechanics experiments. The invention provides the information acquisition device for establishing a relation among acoustic emission, micro-cracks and a constitution; the device comprises an acoustic emission detector, a CT (Computerized Tomography) scanner, a loading pressure machine and a displacement sensor; the loading pressure machine is used for pressurizing a test piece in a sleeve; the displacement sensor is used for measuring axial displacement in a pressurizing process of the test piece; the acoustic emission detector is used for receiving and acquiring an acoustic signal when the test piece is damaged; after an acoustic emission signal is processed, the acoustic emission signal is recorded and analyzed through an acoustic emission host; the CT scanner is used for observing an inner damage condition of the test piece in real time;the sleeve comprises a sleeve body, an upper spherical seat and a lower spherical seat; two ends of the sleeve are in thread connection with the upper spherical seat and the lower spherical seat respectively; and a plurality of round grooves for mounting acoustic emission probes are uniformly arranged around the peripheries of the upper spherical seat and the lower spherical seat.

Description

technical field [0001] The invention discloses an information collection device and method based on real-time rock destruction, belonging to the technical field of rock mechanics experiments. Background technique [0002] The study of rock mechanical properties is one of the frontier topics in the field of rock mechanics. The study of mesoscopic damage mechanics is to study the shape, distribution and evolution characteristics of various types of damage from the microscopic scales such as microcracks and cavities in materials. As a complex engineering material, rock has primary cracks inside. Under the action of external force, the primary cracks can expand and penetrate, and the strain energy stored in the rock will be released in the form of elastic waves. During this change process, the rock will The acoustic emission signals are released, and these acoustic emission signals can be monitored by the acoustic emission probe attached to the surface of the rock material, and...

AI Technical Summary

Problems solved by technology

There are usually three forms of uniaxial presses related to rock mechanics experiments used by major universities and research institutes. The first type: a series of presses independently developed by Academician Ge Xiurun and later widely used by major universities. The disadvantage of scanning with CT equipment is that it cannot be used with acoustic emission equipment, and it is impossible to locate the damage of the specimen in real time

The second is the rock multiple information acquisition system press developed by Shandong University. The advantage is that it can be used with acoustic emission and CT scanning equipment at the same time. The disadvantage is that the loading device is too bulky, which is not conducive to the use and placement of test pieces in the experiment, and its The loading device is exposed to the air, and repeated friction in the experiment will easily lead to rust, which will cause errors in the real-time load of the loading device and affect the experimental results

And the installation mode of the acoustic emission probe is easy to generate confining pressure, which will cause large errors in the experiment; the third is the test device for rock failure characterization developed by Taiyuan University of Technology, which has been disclosed in the CN 104614251B document, and its advantages can be combined with acoustic emission and CT scanning equipment uses and eliminates the influence of the confining pressure of the acoustic emission probe, but the disadvantage is that the loading device is bulky, which is not conducive to the placement of the specimen during the CT scanning process, and the number of probes placed is small, which is not conducive to the location of the specimen damage. The loading strength is small, and some specimens with higher strength cannot be fractured, which has great limitations for the study of rock failure of different materials, and the experimental device has no displacement test unit, so for the rock during the entire loading and failure process, Internal cracks and loads cannot accurately establish the relationship between various data in the loaded state

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