块石对充填体损伤演化影响的声发射表征

doi:10.11872/j.issn.1005-2518.2016.04.096

Abstract

Abstract:

The content of the ballast in the cemented filling body is the key factor to determine the bearing capacity.Acoustic emission experiments are conducted to monitor cemented filling body under uniaxial compression used by RMT-150C material testing machine.Acoustic emission parameters of each stage before peak value of stress-strain can be harvested with 1 MHz acoustic emission sensor.The experimental results show that the effect of the ballast on the changing law of the filling body in different loading stages.Contrast stress-strain-cumulative number of AE events relationship curve，the addition of the block stone is beneficial to reduce the rate of crack generation and expansion of the filling body，and bearing capacity is strengthened.The relation of cemented backfilling’s damage degree described by the number of cumulative AE events and damage-level stress curve are obtained based on the test results.Analysis shows，ballast has a good inhibitory effect on the damage of cemented tailings backfill in the early stage of load bearing and the surge of damage occurred deferred.

Key words: acoustic emission, damage, ballast, AE events

CLC Number:

TD853

ZHUO Yulong，HAN Jianwen，CHEN Chen，FENG Xiao，CAO Shirong，WANG Xiaojun. Acoustic Emission Expression of the Influence of Ballast on Damage Evolution of Filling Body[J].Gold Science and Technology, 2016, 24(4): 96-100.

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Acoustic Emission Expression of the Influence of Ballast on Damage Evolution of Filling Body

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