Research on variation rule of surface potential of coal rock during water-inrush process
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摘要: 通过突水的煤岩表面电位模拟试验系统测试了突水过程煤岩的表面电位，研究了突水过程中煤岩表面电位变化规律，得出结论：煤岩体表面电位对突水演化过程有显著的时空响应特征，能反映煤岩体内部破裂和裂缝扩展情况；突水演化过程可分为孕育期、裂缝扩展期和大规模突水期，孕育期内表面电位信号比较稳定，裂缝扩展期及大规模突水期内电位信号发生上下波动；不同位置表面电位信号水平一般不同，同一位置的信号水平与孔隙水压力及煤岩体破裂强度呈正相关关系。Abstract: Surface potential of coal rock during water-inrush process was tested through a simulated experiment system for surface potential of coal rock, and variation rule of the surface potential of coal rock during water-inrush process was researched. Following conclusions are gotten: The surface potential of coal rock has significant spatiotemporal response characteristics for water-inrush evolution, and can reflect internal rupture and crack expansion conditions of coal rock. Water bursting evolution is divided into three periods, namely incubation period, crack expanding period and systematical water-inrush period. The surface potential signals are relatively stable during incubation period, and fluctuate during crack expanding period and systematical water-inrush period. The surface potential signal level is usually different in different positions. In the same position, the surface potential signal level has positive correlation with pore water pressure or breaking intension of coal rock.
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Keywords:
- water-inrush /
- water-inrush monitoring /
- coal rock /
- surface potential
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