Experiment on the Crack-Electrical Resistance Variation with Compressive Stress of Siliceous-Lime Marble
This paper reports the experiment of compressive process for siliceous-lime marble containing NaCl solution. Two electrodes of copper powder gelatin were fixed on the surface of siliceous- lime marble sample and by means of electric conductivity character of crack or pore water in rock, the experimental data of electrical resistance were measured with stress or strain changing. The electrical resistance of siliceous-lime marble increases continuously with compressive stress from the initial loading to the greatest stress, but the increasing rate of electrical resistance decreases gradually. In the loading process, there isn’t the phenomenon of rock crack closing, but consistent expanding. However, with regard to the relatively high-strength rocks 3-4, their electrical resistance decreases with strain from the initial value and after going through the cracking point, turns to increasing. The experimental results indicate that the law of stress change with strain and that of electrical resistance change with strain are in line with the quadratic fitting equations. Under the axial compressive stress acting, the deflection increasing correlates closely with micro-crack expanding for siliceous-lime marble.
crack-electrical resistance compressive stress experiment measuring
Geng-Ye Chen Liang Cai Gui-Yun Qin Xing-Zhou Zhang
College of Resources and Civil Engineering, Northeastern University, Shenyang College of Earth Sciecne, Jilin University, Changchun
国际会议
香港
英文
1-5
2009-05-19（万方平台首次上网日期，不代表论文的发表时间）