Effect of variation of cross-section dimensions on noise propagation in coal mine excavation roadway

doi:10.16265/j.cnki.issn1003-3033.2024.04.1292

Abstract

Abstract:

In order to study the influence of section size change on noise propagation in long space of coal mine roadway, the simulation method was used to study the noise propagation in the roadway, and to analyze the influence of the changes of section area size, section shape and section area mutation rate on the noise propagation in the roadway of coal mine roadway. The results showed that: the section area size, section shape and section area mutation rate in coal mine tunneling would affect the propagation of noise in the tunnel, when the noise source power and frequency were the same, the attenuation of the sound pressure level increased with the increase of the section area of the roadway. For a given section area (18 m²), when the section shape was different, the attenuation of the sound pressure level was also different, and there would be an obvious acoustic focusing effect when the section shape was arch-shaped. When the cross-section area changed abruptly, the distribution of sound pressure level in the roadway would change, in which the change of cross-section area from large to small was not conducive to noise attenuation, and the change of cross-section area from small to large only affected the sound field after the abrupt change, and the overall sound pressure level in the roadway is not significant. The field test and numerical simulation results of noise attenuation in the tunnel were basically consistent, which verified the reliability of the model and simulation results.

Key words: coal mine excavation roadway, section shape, noise propagation, roadheader, sectional area mutation rate

CLC Number:

X966

YANG Ming, JIA Gaini, QUAN Xingyuan, ZHANG Xuebo, LIU Maomao. Effect of variation of cross-section dimensions on noise propagation in coal mine excavation roadway[J]. China Safety Science Journal, 2024, 34(4): 77-86.

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声源距离/m	截面积/m²
声源距离/m	3	9	18
0.1	129.78	125.94	119.41
10	111.93	108.35	97.27
20	95.93	94.90	87.14
30	88.03	85.24	81.77
40	82.09	79.29	74.28
50	78.68	73.21	66.89
60	77.36	66.50	60.89
70	70.06	64.45	56.09
80	63.10	58.99	54.55
90	59.31	58.27	50.38
100	55.34	53.51	49.00

声源距离/m	截面形状
声源距离/m	正方形	梯形	拱形
0.1	118.44	123.68	117.21
10	100.94	101.19	107.07
20	89.96	89.15	97.52
30	84.31	83.23	93.45
40	78.38	75.83	88.14
50	67.33	68.18	80.64
60	65.36	61.68	75.44
70	65.18	58.74	70.56
80	53.19	56.93	74.95
90	51.36	52.50	74.04
100	55.64	55.74	69.12