Research on Mechanical Features and AE Characteristic Parameters of Filling Body Under Cyclic Loading

An effort is made to study the mechanical features and AE characteristic parameters of filling bodies under repeated loading and unloading, which are common stress paths for the filling bodies of mine, to providing theoretical basis for the monitoring and the bracing of backfilled mine. Material testing machine RMT-150C is used to conduct uniaxial compression experiments on cemented filling body under above mentioned stress paths and 1MHZ broad-band emission sensor is employed to collect AE parameters prior to the arrival on peak compression strength. The results indicate that comparing to monotonic loading, cyclic loading could elevate the peak stress of filling bodies by about 30%. The stress-strain-accumulative AE number curves of specimens under cyclic loading tells the surge of accumulative AE number on specimens’ reaching peak stress, which combining with test process proves the thorough failure of filling body. It is then demonstrated that the surge of accumulative AE number could serve as a reference criterion for judging the failure of filling bodies.