单轴压缩条件下煤样电荷感应试验研究

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Abstract Using the self-developed charge-induced instrument，the experimental system for collecting the charge-induced signal in the process of coal deformation and fracture is set up. The law of charge induction of coal in the same mine during the coal deformation and fracture process is studied under different loading rates in laboratory. The experimental results show that the charge-induced signal is generated during the deformation and fracture process of coal；and the charge-induced signal is the instantaneous pulse. The charge-induced signal strength is the most powerful before the peak stress of coal；and the signal strength is more powerful when coal damages. The charge-induced signals on all surfaces are asynchronous，and their magnitudes are varied. The charge-induced signal strength is more powerful at the larger fracture surface. The greater the loading rate is，the stronger the charge-induced signal strength is. Under sudden loading and unloading，there would generate charge-induced signal with low strength. The main reasons for charge generation in the process of coal deformation and fracture are friction and crack tip charge separation because of micro-rupture. The results suggest that the charge-induced signal is closely related to the deformation and fracture of coal；the status of coal deformation and fracture may be determined by the charge-induced signal. The charge induction method is applicable to studying the exploration of the rock deformation and failure process and predicting catastrophic dynamic phenomena.

Key words： mining engineering charge induction deformation and fracture coal loading rate loading and unloading

Received: 15 September 2010

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http://www.rockmech.org/EN/Y2011/V30/I2/306

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