Influence of Atmospheric Pressure Fluctuation on Air Leakage Rate of Airtight-wall

Aiming at strengthening the airtight-wall tightness, reducing its leakage rate, so that extinguishing the combustion in the burning area as soon as possible, this paper proposes the new ideas that the atmospheric pressure changes is important affecting factor to airtight-wall leakage rate in airtight burning area. Adopting the comprehensive research method of theoretical analysis, field measurement, and numerical calculation, this paper studies the influence law of the periodical change of the atmospheric pressure on the airtight-wall leakage rate, the results show that: the curve of underground pressure is sinusoid approximately; the atmospheric pressure changes is the main reason for the internal and external pressure difference of the airtight-wall; the gas exchange capacity of internal and external burning area is large, the gas exchange capacity of calculation example is more than 1400m3 every day. To reduce the firewall leakage rate, this paper proposes the specific solutions including building gas pressure balance room, strengthening airtight-wall tightness, and reducing the burning area volume, etc.