Microearthquake or acoustic emission abnormal arrival time determining method

A determination method and acoustic emission technology, applied in the fields of seismology, seismic signal processing, measurement devices, etc., can solve the problem of positioning result error, etc., and achieve the effect of high reliability and accuracy

Active Publication Date: 2016-12-07
CENT SOUTH UNIV
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Problems solved by technology

In the process of microseismic and acoustic emission positioning, the sensor will receive some abnormal arrival information. If this

Method used

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  • Microearthquake or acoustic emission abnormal arrival time determining method
  • Microearthquake or acoustic emission abnormal arrival time determining method
  • Microearthquake or acoustic emission abnormal arrival time determining method

Examples

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Embodiment 1

[0023] Assuming that there are 9 sensors distributed on the surface of a cube in an acoustic emission test system, take the coordinates of each sensor A (0, 0, 0), B (1000, 0, 0), C (1000, 1000, 0), D (0, 1000, 0), E (500, 0, 1000), F (1000, 500, 1000), G (500, 1000, 1000), H (0, 500, 1000), I (500, 1000, 500), the unit is m. In the test, the acoustic emission signals generated at a certain point S reach the above sensors at 201.5115ms, 225.7467ms, 208.7300ms, 182.2370ms, 125.8130ms, 141.5600ms, 91.8270ms, 83.3900ms, 87.6800ms respectively, and the wave speed is unknown.

[0024] This example is used to describe in detail the method for determining the abnormal arrival of microseisms or acoustic emissions. The specific implementation steps are as follows:

[0025] (1) Since the wave velocity of the system is unknown, 5 arrival data are needed for positioning, and the number of sensors is 9, so we can get Group time data.

[0026] (2) For 126 sets of arrival data, use one ...

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Abstract

The invention discloses a microearthquake or acoustic emission abnormal arrival time determining method. The method comprises the steps of conducting primary processing on n obtained arrival time data according to conditions in a microearthquake or acoustic emission test, so that m sets of arrival time data are obtained; obtaining m sets of microearthquake sources or acoustic emission coordinates by means of the m sets of arrival time data; fitting m sets of microearthquake or acoustic emission positioning results with a Logistic probability distribution function, and obtaining Logistic probability distribution functions Fx, Fy and Fz about x, y and z respectively; obtaining the Logistic probability distribution functions Fx, Fy and Fz when Fx, Fy and Fz are smaller than 0.005, finding positioning results meeting the solutions from the m sets of positioning results, and calling the positioning results as abnormal positioning results, wherein arrival time data corresponding to the abnormal positioning results contain abnormal arrival time data. The method has the advantages of being high in precision and easy to realize.

Description

technical field [0001] The invention relates to a method for determining the abnormal arrival time of microseisms or acoustic emissions. technical background [0002] Microseismic and acoustic emission technologies are widely used in the monitoring field of mining process and underground construction process to provide safety information for underground engineering. During the process of microseismic and acoustic emission positioning, the sensor will receive some abnormal arrival information. If this information is directly used for microseismic and acoustic emission positioning, it will cause great errors in the positioning results. Therefore, how to identify and eliminate these abnormal arrival data is of great significance in the microseismic and acoustic emission positioning technology. [0003] In the field of determining the arrival time of microseismic and acoustic emission abnormalities, the method for determining the abnormal arrival time of microseismic or acousti...

Claims

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Application Information

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IPC IPC(8): G01V1/36
CPCG01V1/362G01V2210/3248G01V2210/6161
Inventor 董陇军李夕兵邹伟王泽伟尚雪义
Owner CENT SOUTH UNIV
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