Numerical Modeling of Distribution Characteristics for Collapse Column Temperature Field Under the Action of Seepage

To reveal the distribution characteristics of temperature field in collapse columns under the action of seepage, a coupled seepage-temperature mathematical model is established based on porous media seepage of rock mass and heat transfer theory. The space distribution characteristics of seepage velocity and temperature field in the collapse columns were investigated under different permeability by taking II5₁ collapse column as model and Ordovician limestone aquifer as heat resource. The research results indicate that the increasing permeability increases the groundwater seepage velocity, and then extends the relative high-temperature area. The seepage effect on the temperature distribution is clearer in the vertical direction than that in horizontal direction, and the temperature gradient in the collapse column is lower than that in the surrounding rock. The temperature of the surrounding rock is higher when it is closer to the collapse column. Temperature difference reaches 2 ℃ to 8 ℃ when it is in the range of 50 m away from collapse column. So it is feasible to predict collapse columns by temperature detection.