The geothermal power generation with Enhanced Geothermal Systems (EGS) is considered as a new and clean energy resource. Though, the establishment of an EGS requires the employment of the hydraulic fracturing method which can lead to different levels of seismic events. An effective monitoring technic that can control these earthquakes is the Acoustic Emission (AE) monitoring technic. However, mostly using this method in a laboratory or in-situ condition is technically difficult and costly. Nevertheless, by simulating this method and verifying the results with the experimental data, the AE monitoring method would be applicable with high certainty. In this study, the effect of loading type on a crystalline rock has been investigated by experiments and numerical simulations. For this purpose, specimens of granite rock were tested under monotonic and progressive loading. The test program included UCS, BTS, and SCB tests. The tensile mechanism is the dominant failure mechanism in these tests. The experimental tests with monotonic loading were conducted with AE monitoring and AE parameters such as energy, source mechanism, and hit-rate were studied. Besides, the rest of the experimental tests were conducted with progressive loading to investigate the failure mechanism and strain energy release at peak strength. Afterward, the AE monitoring technic was simulated by two-dimensional Particle-Flow Code. The results of simulated tests were verified depending on experimental results in monotonic loading condition. Then the simulation was run for progressive loading condition. It’s was concluded that by applying the progressive loading, the peak strength and released energy decreased dramatically and differently for each test.
