单轴压力下煤样表面电位实验

Experiment on surface potential of coal under uniaxial compression

建立了煤岩变形破裂过程表面电位测试实验系统,研究了不同试样单轴压力下变形破裂过程中的表面电位特征规律.结果表明,原煤、型煤和混凝土在受单轴压力变形破裂过程中都有表面电位产生,并且表面电位在整个变形破裂过程中始终存在.从总体上看,表面电位和载荷的变化趋势一致;载荷突变时,表面电位信号也出现突变,表面电位的突变幅度和载荷的突变幅度成正相关.

The experimental system for collecting surface potential was founded. The research was made on the characteristic of surface potential signal during the deformation and fracture of coal and concrete. The results show that surface potential signal generates during the process and exists during the whole deformation and fracture of coal and concrete. As a whole, the change tendency of the surface potential with the load is the same. When there is a break in load, the surface potential signal will change as well and the break extent of the surface potential and the load are positive correlation.