A series of uniaxial-compression tests were conducted on some representative brittle rock
specimens, such as granite, marble and dolerite. A multi-channel, high-speed AE signal acquiring
and analyzing system was employed to acquire and record the characteristics of AE events and
demonstrate the temporal and spatial distribution of these events during the rupture-brewing
process. The test result showed that in the primary stage, many low amplitude AE events were
developed rapidly and distributed randomly throughout the entire specimens. In the second stage,
the number of AE increased much slower than that in the first stage, while the amplitude of most
AE events became greater. Contrarily to the primary stage, AE events clustered in the middle area
of the specimen and distributed vertically conformed to the orientation of compression. The most
distinct characteristic of this stage was a vacant gap formed approximately in the central part of the
specimen. In the last stage, the number of AE events increased sharply and their magnitude
increased accordingly. The final failure location coincidently inhabited the aforementioned gap. The
main conclusion is that most macrocracks are developed from the surrounding microcracks existed
earlier and their positions occupy the earlier formed gaps, and the AE activity usually becomes
quite acute before the main rupture occurs.
EFFECTIVENESS OF COUNSELLING PROGRAM USING PLYING TO CONTROL ANGER IN A SAMPLE OF PRIMARY STAGE CHILDREN ( STUDY IN DIFFRNT ENVIRONMENTS
