Abstract：Micro-seismic technology is an important means of monitoring the stability of concrete construction. The characteristic indices of micro-seismic signals during the cracking process of material are the premise of accurately predicting. The soundless cracking agent was applied to realizing static micro-seismic tensile failure at different rates, and the coal or rock dynamic disaster experimental simulation system of ZDKT-1 type was used for real-time monitoring the micro-seismic signals in the cracking processes. By analyzing the variation characteristics of micro-seismic signal amplitude, energy and spectrum of micro-seismic signals during the static cracking processes of cement mortar, it is found that as a quasi-homogeneous material, there are three longitudinal cracks, but no transverse cracks after static cracking in cement mortar. Both amplitude and spectrum of micro-seismic signals are related to the static cracking rate, and the greater the cracking rate is, the greater the average amplitude of micro-seismic signals is and the wider the frequency domain of signals is. The number of micro-seismic events is related to the eventual total crack area. The larger the crack area is, the more the micro-seismic events are. The amplitude and energy of micro-seismic signals in the static cracking process do not change monotonically, but switch between weak and strong, and the microseisms signals were paroxysmal in the entire process.
