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| Statistical analysis of mechanical characteristics of composite lining for loess tunnels |
| LI Pengfei, WANG Fan
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| Key Lab of Urban Security and Disaster Engineering of Ministry of Education, Beijing University of Technology, Beijing 100124, China |
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Abstract Based on statistical analysis of mechanical characteristics of secondary lining for 28 monitoring cross-sections of 13 loess tunnels in the literatures, the population distribution characteristics of the contact pressure between primary support and secondary lining, and their relationship with their classification grade, buried depth and excavation span of tunnels were studied. Through the statistical analysis of in-situ monitoring data of the contact pressure, the variation law with time-change and the spatial distribution law were studied. The research results showed that the contact pressure of the tunnel increased with the increase of the buried depth and the excavation span, and its time history experienced a process of first increasing to the peak value and then decreasing for a period of time, and then continuously increasing and tending to be stable. The contact pressures around the tunnel circumference gradually increased from the crown→the arch shoulder→the arch waist→the arch foot. The research conclusion of this paper has some reference value in analyzing the pressure mechanism of loess tunnels and perfecting the design method of supporting structure.
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Received: 02 April 2021
Published: 20 June 2021
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