摘要
The influence of rock mechanical properties on the electromagnetic radiation(EMR)mechanism of rock fracturing is an important research topic in solid mechanics and earthquake prediction.In this study,an EMR model of rock fracturing considering the fracture factor,elastic modulus,Poisson’s ratio,radiation distance and crack length is derived based on the Hertz oscillator array assumption.An experimental system,including an electromagnetic shielding module,an EMR signal induction and transmission module,a signal recording module and a loading module,is developed to understand the EMR characteristics of four different rocks.The validity of the EMR theoretical model is verified and the relationships between the rock cracking morphology and the EMR waveform,amplitude and frequency are revealed.It is found that rock mechanical properties have obvious influences on the EMR waveform,amplitude and frequency during rock fracturing.This study provides a better understanding on the EMR mechanism of rock fracturing and can help to improve the accuracy of rock disaster prediction based on EMR.
基金
supported by the National Natural Science Foundation of China(Grant Nos.51979146 and 11272178)。
作者简介
Corresponding author:Peng Lin,has a BSc degree in Mining Engineering from Northeastern University,China,in 1995,and obtained his PhD degree in Rock Mechanics from the same university in 2002.Then,he was employed as a research assistant at the Department of Civil and Structural Engineering,the Hong Kong Polytechnic University,China,from 1998 to 2001.He joined in Department of Hydraulic Engineering,Tsinghua University,China,as a postdoctoral researcher in 2002,and was promoted to professor in 2014.He has been a guest professor in Graz University of Technology in 2016.He serves on the editorial boards of several renowned international journals including Rock Mechanics and Rock Engineering,Tunneling and Underground Space Technology,and Journal of Rock Mechanics and Geotechnical Engineering.His research interests include(1)properties evolution and failure behaviors of brittle materials,(2)overall stability of dam-foundation,underground cavern group and high slopes,and(3)intelligent construction and management.E-mail address:celinpe@tsinghua.edu.cn。
