Rock burst precursor monitoring and diagnosing system and method based on distributed optical fiber radioactivity sensing

Abstract

The present application belongs to the technical field of radioactivity measurement, and particularly relates to a rock burst precursor monitoring and diagnosing system and method based on distributed optical fiber radioactivity sensing; comprising an armored sensing optical cable monitoring network laid in tunnel surrounding rock, working face and deep borehole, a composite modulation demodulation instrument of composite distributed optical fiber DRS / DTS sensing, and a rock burst cracking stage diagnosis and early warning module. By using the characteristics that natural radionuclides are released by micro-fracture of surrounding rock during rock burst incubation and migrate and release in the fracture network, high spatio-temporal resolution radionuclide concentration spatio-temporal distribution data are continuously and real-timely acquired through the sensing optical cable; by combining temperature drift correction and signal decomposition algorithm, the paradigm unit characteristic parameters (transient pulse intensity A max and balanced fluctuation intensity A eq ) of the radionuclide signal are extracted, and the surrounding rock fracture area and fracture opening evolution are inversed based on the constitutive relation, and then the fracture initiation, opening, expansion and extension stages of rock burst incubation are diagnosed, and the advanced warning of rock burst disaster is realized.

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