US 12,105,058 B2
Method and system for determining acoustic emission (AE) parameters of rock based on moment tensor analysis
Lei Xue, Beijing (CN); Mengyang Zhai, Beijing (CN); Fengchang Bu, Beijing (CN); Xiaolin Huang, Beijing (CN); Ke Zhang, Beijing (CN); and Chao Xu, Beijing (CN)
Assigned to INSTITUTE OF GEOLOGY AND GEOPHYSICS, CHINESE ACADEMY OF SCIENCES, Beijing (CN)
Filed by INSTITUTE OF GEOLOGY AND GEOPHYSICS, CHINESE ACADEMY OF SCIENCES, Beijing (CN)
Filed on Mar. 18, 2022, as Appl. No. 17/655,413.
Claims priority of application No. 202111206685.1 (CN), filed on Oct. 18, 2021.
Prior Publication US 2023/0123452 A1, Apr. 20, 2023
Int. Cl. G01N 3/06 (2006.01); G01N 3/08 (2006.01); G01N 3/60 (2006.01)
CPC G01N 3/068 (2013.01) [G01N 3/08 (2013.01); G01N 3/60 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A method for determining acoustic emission (AE) parameters of rock based on moment tensor analysis, comprising:
acquiring macroscopic mechanical parameters of a rock specimen to be tested;
constructing, according to the macroscopic mechanical parameters, a numerical model of the rock specimen to be tested, the numerical model comprising multiple rock grains that are bonded by an adhesive;
loading the numerical model through particle flow code (PFC) software to simulate a failure process of the rock specimen to be tested, and identifying fracturing time and positions of microcracks when the PFC software loads the numerical model, wherein when the PFC software loads the numerical model, fractures of bonded points between the rock grains respectively represent the microcracks;
determining, when the PFC software loads the numerical model, if rock grains of two sequentially generated microcracks comprise common rock grains, and an interval for generating the two microcracks is less than duration time of a present AE event, the two microcracks as a same AE event, wherein initial duration time of the present AE event is duration time generating a first microcrack in the present AE event, the duration time generating the first microcrack is propagation time of the microcrack in a rock grain having a greater diameter in two rock grains generating the microcrack, and a propagation velocity of the microcrack is a half of a shear wave velocity of the rock specimen to be tested;
taking a spatial range covered by all microcracks corresponding to an AE event as a spatial range of the corresponding AE event, and taking geometric centers of all microcracks within the spatial range of the AE event as source positions of the corresponding AE event; and
determining AE parameters of the AE event according to moment tensor analysis.