Issue 49

M. Semin et alii, Frattura ed Integrità Strutturale, 49 (2019) 167-176; DOI: 10.3221/IGF-ESIS.49.18 172 Parameter Value Thermal conductivity of the frozen rock mass, W/(m  °С) 3.84 Thermal conductivity of the unfrozen rock mass, W/(m  °С) 2.37 Specific heat capacity of the frozen rock mass, J/(kg  °C) 1223 Specific heat capacity of the unfrozen rock mass, J/(kg  °C) 1958 Density of the frozen and unfrozen rock mass, kg/m 3 2580 Porosity 0.35 Density of the groundwater, kg/m 3 998 Specific heat capacity of the groundwater, J/(kg  °C) 4200 Specific heat of groundwater phase transition, J/kg 333000 Absolute permeability of rock mass, m 2 6.5  10 -12 Groundwater density, kg/m 3 998 Temperature when freezing begins, °С 0 Initial temperature of rock mass, °С 10 Heat exchange coefficient between the rock mass and the coolant in the freezing pipe, W/(m 2  °С) 25 Number of freezing pipes 41 Freezing pipe radius, m 0.073 Freezing contour radius, m 8.2 Domain width (length), m 35 Coefficient М 0.33 Coefficient B 1.8 Table 1 : Input data for numerical calculation. Figure 4 : Coolant temperature vs time