静力破碎花岗岩电磁辐射信号的分形特征

发布时间：2018-10-15 18:35

【摘要】：选用球型压头和十字型压头在RMT-150C岩石力学试验机上对花岗岩分别进行不同加载速率的岩石破碎实验,采用KBD5电磁辐射数据采集系统对岩石破碎过程中产生的电磁辐射信号进行采集处理,应用分形理论分析电磁辐射脉冲数的分形特征.实验结果表明:试件在受载过程中电磁辐射脉冲数与时间具有明显的分形特征,并随加载速率增大电磁辐射信号强度增大,分形维数D也增大,具有很好的相关性;在相同速率的岩石加载破碎条件下,十字型压头电磁辐射分形维数D比球型压头的大,与电磁辐射脉冲信号的强度变化呈相同的规律,利用电磁辐射脉冲信号和分形维数D的相同规律可以更全面地反映岩石的真实破裂过程.
[Abstract]:The ball head and the cross type head were selected to carry out the rock crushing experiments of granite at different loading rates on the RMT-150C rock mechanics testing machine. KBD5 electromagnetic radiation data acquisition system is used to collect and process electromagnetic radiation signals produced in rock fragmentation process. Fractal theory is applied to analyze the fractal characteristics of electromagnetic radiation pulse number. The experimental results show that the number of electromagnetic radiation pulses and the time have obvious fractal characteristics in the process of loading, and the intensity of electromagnetic radiation signal increases with the increase of loading rate, and the fractal dimension D also increases, which has a good correlation. Under the condition of rock breaking at the same rate, the fractal dimension D of electromagnetic radiation of cross type pressure head is larger than that of spherical head, and the change of intensity of electromagnetic radiation pulse signal is the same as that of electromagnetic radiation pulse signal. By using the same law of electromagnetic radiation pulse signal and fractal dimension D, the true fracture process of rock can be more fully reflected.
【作者单位】：湖南科技大学资源环境与安全工程学院;湖南科技大学煤矿安全开采技术湖南省重点实验室;
【基金】：国家自然科学基金资助项目(51474103) 湖南省自然科学基金资助项目(2015JJ2070) 湖南省研究生科研创新项目(CX2015B508)
【分类号】：TD315

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