Acoustic Emission Location Experiment Research on Stope Roof Breakage Boundaries Time-Varying Process

ABSTRACT

This paper utilizes self-designed time-varying boundary sound emission test system for rock stratum fracture to complete the sound emission orientation test upon the fracture of marble slab. A new method—image diagnosis and orientation method is proposed to locate fracture section. Sound emission signal Y Position and Events-X position distribution point diagram is utilized to determine the position of fracture surface; by analyzing the time-varying curve of Counts, Energy and Hits of acoustic emission signal in the same stage, the occurrence moment of rock stratum fracture section is confirmed and the development mechanism of fracture section is analyzed. Through study, it can be concluded that located fracture section position is close to actual fracture position, indicating that sound emission image diagnosis technique is characterized by high orientation precision, small error and good orientation effect; sound emission image diagnosis orientation method has very excellent maneuverability and practicability.

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