Том: 193 , Год издания: 2018

The paper considers a series of experiments with sand samples containing ice. The acoustic measurements were performed in specialized laboratory setup which allows also to form synthetic hydrate-bearing samples in order to find differences between ice and methane hydrate. We find that the velocities of compressional and shear waves depend on the rate of temperature drop below 0°C. During the long-time maintaining of the constant negative temperature the decreasing of the velocities was observed. These dependences can possibly be explained by that in a case of quick freezing formed ice is not energetically favourable, after formation ice particles reconstruct into the pore space with less mechanical stress.