Blast hole blocking method under low-temperature condition

The invention provides a blast hole blocking method under a low-temperature condition. The method is simple, low in cost and good in blocking effect, and has the advantages that construction is convenient, and the method is economical, environment-friendly, safe and efficient. The blast hole blocking method under the low-temperature condition comprises the following steps that 1, an air spacer is arranged at the bottom of a blast hole blocking section; 2, the blast hole blocking section is filled with rock slag or gravel to serve as blocking section filler; 3, the flowing speed of water in the blocking section filler is calculated; 4, the time required by water for flowing to the bottom of the blocking section through the blocking section filler is determined; 5, the initial irrigation temperature is determined; and 6, the water temperature is adjusted to be the initial irrigation temperature, then water is poured into the blocking section filler located in the blast hole blocking section, the water is frozen