AE法岩石应力测量中试机晃动量问题

声发射法岩石记忆应力测量中,定区测试的对称干扰信号来自试样端面的摩擦。通过测量试样加压过程中试台晃量及其变化,可了解试样端面摩擦引起AE干扰信号的相应大小及其变化。实测结果显示试样加压的初始阶段,试台晃量及相应干扰信号皆最为显著。结合当前测试水平,笔者给出了克服对称干扰信号的方法和见解。 

THE SWAYING PROBLEM OF UNIVERSAL TESTING MACHINE IN THE MEASUREMENT OF ROCK STRESS BY AE METHOD DING Yuan-chen,WANG Xi-hai,HE Pei-yuan

In the measurement for memorized rock stress by AE method,the symmetrical disturbance for AE in limited receiving scope comes from the fraction between endsurfaces of specimen and pressure heads of universal testing machine.The magnitude and change of the disturbauce for AE can be obtained by the measurement of swaying magnitude and change of test rig of universal testing machine in the process for uniaxial compression test.The measuring results show that the sway and the corresponding disturbance for AE are all remarkable in the beginning stage of compressing specimen.The methods and the viewpoints for overcoming the symmetrical disturbance for AE are given by authors on the basis of the level for the measurement at present.