- ISSN 0258-2724
- CN 51-1277/U
- EI Compendex
- Scopus
- Indexed by Core Journals of China, Chinese S&T Journal Citation Reports
- Chinese S&T Journal Citation Reports
- Chinese Science Citation Database
| Citation: | CHEN Zheng, GUO Chun, CHEN Guizhou, ZHANG Jiapeng, XU Yumin. Oxygen Supply Concentration and Labor Intensity of High Altitude Tunnel Based on MEC-BP[J]. Journal of Southwest Jiaotong University, 2023, 58(3): 622-629. doi: 10.3969/j.issn.0258-2724.20210669
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In order to solve the key technology of oxygen supply in high-altitude tunnel construction, the influence of oxygen supply concentration and labor power on labor intensity in a high-altitude tunnel is studied. Through field measurement in Guigala Tunnel in Dazi District, Lhasa, Tibet, the average energy metabolic rate is used as the indicator to measure labor intensity. The lung flux data of six testers under different labor intensities (labor power of 50, 75, and 100 W) and oxygen supply concentrations (20.9%, 25.0%, and 29.0%) are collected by using the lung ventilation meter, and the data are then converted into the indicator of labor intensity. The mind evolutionary computation back-propagation (MEC-BP) neural network is used to fit the labor intensity indicator. The results show that the goodness of fit of the MEC-BP neural network is slightly higher than that of GA-BP and BP neural networks. Experimental tests and MEC-BP neural network fitting data show that under low labor power of 50 W, the average energy metabolic rate of construction personnel changes slightly with oxygen concentration, with a maximum value of about 0.1 kJ/(min•m2). Under high labor power of 100 W, an oxygen supply concentration of 25% can be used as the reference value of oxygen supply concentration at the plateau of 4 200 m.
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CHEN Zheng, GUO Chun, CHEN Guizhou, ZHANG Jiapeng, XU Yumin. Oxygen Supply Concentration and Labor Intensity of High Altitude Tunnel Based on MEC-BP[J]. Journal of Southwest Jiaotong University, 2023, 58(3): 622-629. doi: 10.3969/j.issn.0258-2724.20210669
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