The central opening method is commonly adopted by the technology of traditional mechanical connecting channel, and the connecting channel-main tunnel structure is a symmetrical force system. However, in suburban railway tunnels, there may be a certain eccentricity between the centerline of the connecting channel and the main tunnel, due to the height of the evacuation platform, resulting in the formation of an asymmetric structural system between them. Its dynamic response under train vibration is inevitably different from that of the symmetric structural system. Based on a 9 m level shield tunnel of a suburban railway, a three-dimensional numerical calculation model was established to study the dynamic response of the connecting channel-main tunnel structural system with different eccentricity (0 m, 0.3 m, 0.6 m, 0.9 m, 1.2 m) conditions under train load. The research results show that under the dynamic load of a bidirectional train with a speed of 160 km/h, as the eccentricity between the main tunnel and the connecting passage increases, the vertical displacement, acceleration, and dynamic stress at the connection between the main tunnel and the connecting channel all increase to varying degrees. Compared with the central opening, the maximum dynamic displacement at an eccentricity of 1.2 m increases by 7.7%, the maximum acceleration increases by 27.7%, and the maximum dynamic stress of the lower soil increases by 28.5%. However, the difference in eccentricity has a limited impact on the dynamic response of the structural system. Under the geological parameters studied in this article, the influence of dynamic stress is within a depth of 9m below the connection between the two structures. The research results can provide a reference for the application of mechanical connecting channel technology in suburban railway.
Li Yitao
,
Di Honggui
,
Yu Jing
,
Shen Li
,
Zhou Meng
. Response Research on Eccentric Connecting Channel-Main Tunnel System under Train Vibration[J]. Chinese Journal of Underground Space and Engineering, 2024
, 20(S2)
: 865
-873
.
DOI: 10.20174/j.JUSE.2024.S2.41
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