CHINA MINE ENGINEERING

In order to study the effects of strain rate and water content on energy dissipation of frozen clay, the energy dissipation characteristics of frozen clay under different impact velocities (4~10m/s) and different water content conditions (9%~18%) were investigated comprehensively by means of ?50mm Split Hopkinson Pressure Bar kinetic test. The test results show that: (1) from the perspective of dissipation energy, the energy absorption process of frozen clay damage is divided into three stages: slow growth, rapid growth and stabilization; there is a positive primary function correlation between dissipation energy, reflected energy and transmissive energy and incident energy (R²＞0.94), and there is also a linear positive correlation between incident energy, reflected energy, transmissive energy and dissipation energy and average strain rate (R²＞0.87); with As the water content increased, the energy reflection coefficient, energy transmission coefficient and energy dissipation coefficient showed decreasing and then increasing, increasing and then decreasing trends, respectively. The results of the study provide reference for the construction of blasting projects in permafrost areas.