(1. School of Mechanics and Engineering，Liaoning Technical University，Fuxin，Liaoning 123000，China；
2. Institute of Mechanics，Chinese Academy of Sciences，Beijing 100190，China；3. Institute of
Mining Technology，Taiyuan University of Technology，Taiyuan，Shanxi 030024，China)
Abstract：Power ultrasonic incentive promoting desorption of methane in coal seam is a kind of general applicable value technology，which is out of limit controlled by reservoir geologic conditions and source gas characteristics. Through CT observation and promoting desorption experiment，the rule of coal samples different scales fracture development is analyzed considering ultrasonic effect，from microscopy to reveal the power ultrasonic promoting desorption mechanism. In contrast to the experimental determination of promoting desorption results，the rule of gas desorption quantity in coal sample changing with time by power ultrasonic action is studied. Research results show that：CT observation is the good proof that the ultrasonic mechanical shatter role. In the power ultrasonic incentive effect，the number of coal sample fracture significantly increased；transfixion crack increased and a single crack maximum width increased significantly；methane desorption quantity of coal has increased dramatically by ultrasonic incentive；the modifier formula of ultrasound promoting methane desorption quantity changing with time in the coal is established. The fitting correction formula show that：gas desorption quantity and increased with increasing pore pressure after saturated adsorption；the methane saturated adsorption desorption quantity is greater than the desorption quantity without ultrasonic incentive in same pore pressure；the reason is that in the influence of power ultrasonic field strength，coal point of kinetic energy and potential energy increase，the coal surface even matrix internal adsorption of methane easier to stripping into determination of free，so as to achieve coal seam methane promoting desorption effect.
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2013, Vol. 32 
