巷道断面形状对井下避险设施承受爆炸冲击载荷的影响
Influence of Different Laneway Sections on Coal Mine Refuge Facilities Borne Explosion Impact Load
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摘要: 为了研究井下发生瓦斯煤尘爆炸时，巷道断面形状对避险设施承受爆炸冲击载荷的影响，在相同爆源条件下，以救生舱为例，对其在半圆拱形、矩形及梯形3种典型断面巷道中采用一侧布设方式，舱体承受冲击波载荷进行了有限元模拟计算，对比分析了不同断面巷道中舱体各端面所受冲击载荷特性。模拟计算结果表明，流场压力与舱体各端面所承受的冲击压力并不呈现线性关系；矩形断面较梯形与半圆拱形作用到救生舱前、后端面的冲击波超压略大，作用到救生舱顶部的冲击超压变化波动较大，但由于舱体左侧空间较大，舱体左侧承受超压冲击较小；3种断面作用到舱体右侧的冲击超压均呈现前端小，中部增大，后端逐步平缓的趋势。Abstract: To study the influence of different tunnel cross-sections on refuge facilities borne explosion impact load in coal mine when gas and coal dust explosion occurs in underground coal mine, taking refuge chamber as an example, under the condition of the same blast energy and side layout mode, shock wave loaded on chamber is simulated in typical laneway sections including semicircular arch, rectangle and trapezoid, then, load characteristics of different chamber faces are analyzed. The simulation results show that the relationship between shock pressure loaded on chamber side and fluid pressure is not linear, and shock wave loaded on front side and rear side of chamber in rectangle laneway is slightly larger than that of two other sections; meanwhile, overpressure of top side in rectangle laneway fluctuates greatly, however, overpressure of left side is smaller because of larger space. Overpressure loaded on right side shows the same trend that the front part is small, the middle is enlarged, the back end is gradually smooth.
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Keywords:
- refuge facilities /
- tunnel cross-section /
- impact load /
- numerical modeling /
- finite element
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