Method and device for acoustic discrimination of multistage yield points by rock triaxial single sample method

Abstract

The invention discloses a method and a device for acoustic discrimination of multistage yield points by a rock triaxial single sample method. The upper end and the lower end in a triaxial chamber are respectively provided with an upper rigid pressure head and a lower rigid pressure head; the device is characterized in that an acoustic emission (AE) probe and an acoustic wave probe coupling testing device are respectively and fixedly arranged in the upper rigid pressure head and the lower rigid pressure head in a sealing way, and are used for bearing the high-pressure oil in the triaxial chamber; an AE acquisition system and an acoustic meter are connected; in the rock axial loading process, AE test and acoustic wave velocity test are completed at the same time in the whole process of rock microcrack dynamic propagation until yield failure, and the like; the experiment information data such as AE and acoustic wave can be output by the AE acquisition system and the acoustic meter in the rock failure process; the yield points can be judged jointly according to the propagation of microcrack in rock matrix, the AE characteristic change law near the yield points and the acoustic wave velocity change characteristics; the level of axial pressure loading is controlled to be stopped by a computer, and the next level of axial pressure loading of confining pressure is carried out; the multistage yield points of a rock single sample test piece are sequentially discriminated and tested.

Description

technical field [0001] The invention belongs to the field of rock mechanics test, relates to a rock fracture process and mechanism research technology and a brittle rock single-sample triaxial test technology, in particular to an acoustic discrimination method and device for multi-level yield point of rock triaxial single-sample method . Background technique [0002] With the rapid development of my country's social economy, the large-scale development of water conservancy resources, the rapid expansion of railway transportation and the rise of nuclear power industry, the large-scale projects related to rock mass are increasing, and these projects also show the characteristics of large-scale and large-scale buried depth. . In the research of deep rock mechanics and engineering, there are a series of challenging rock mechanics and engineering topics such as high in-situ stress, structural safety caused by high external water pressure, rock burst and rapid construction of long...

AI Technical Summary

Problems solved by technology

[0008] Under high-stress triaxial test conditions, the rock is placed in a chamber with high oil pressure through a rubber sleeve, and the acoustic wave velocity test and acoustic emission test of the rock specimen become more difficult

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