Research on factors influencing the deep gushing water cooling process in constant temperature zone

Abstract

For the high-temperature thermal hazards faced by deep underground engineering, it is proposed that water flow borehole with corresponding specifications and quantities were arranged in the constant temperature zone to form a borehole network. Water in deep underground engineering was led to the borehole network for cooling and recycling. The reasonable spacing of boreholes was studied by using ANSYS FLUENT to achieve an optimal cooling effect. The results show that the main factors influencing the cooling of the constant temperature zone in Xiadian gold mine are water velocity v, borehole diameter Ф, borehole length L and rock thermal conductivity λ. The optimal parameters are water velocity v = 0.5 m/s, borehole diameter Ф = 80 mm, borehole length L = 40 m and rock thermal conductivity λ = 4.1 W (m °C)−1. According to the optimal solution, the maximum temperature influence radius in the cooling process is r = 0.5 m. When the distance between any two boreholes is 2.5 times the maximum temperature influencing radius, that is 1.25 m, the temperature variations between boreholes will not affect each other. Cooling effect is good and layout area of the borehole network is small. It makes full use of existing resources, and provides a reliable reference for energy conservation and consumption reduction.