Evolution Analysis of Vibration Source Intensity of Subway Station Under the Influence of Closely-Spaced Undercrossing

doi:10.12141/j.issn.1000-565X.240421

Abstract

Abstract:

As an extreme case of adjacent construction in underground engineering, closely-spaced undercrossing will cause significant disturbance deformation in the existing structure, directly affecting their normal service performance. Taking the frozen, mined underpassing of an operational metro station as the research objective, a coupled simulation was conducted based on the vehicle-track dynamic interaction method and refined finite element modeling techniques，and a dynamic finite element model was established to simulate the close-proximity underpassing construction of vertically overlapping structures in soft coastal strata, which was further validated through real-time monitoring of the operational metro line. By converting the railway track irregularity induced by closely-spaced undercrossing into wheel-rail dynamic excitations and applying it to the finite element model, the time-frequency cha-racteristics of dynamic interactions between the track structure and tunnel foundation were calculated and analyzed. Furthermore, the evolution of vibration source intensity of the subway station was simulated in three construction stages: before soil freezing, after soil freezing, and after the breakthrough of the newly constructed tunnel. The results show that the wheel-rail dynamic excitation in the metro line is transmitted through the various layers of the track structure to the tunnel foundation, subsequentlly causing vibrations in the structure’s base slab and sidewalls. Due to the effects of transmission distance and direction, the system’s dynamic energy continuously atte-nuates along the transmission path, resulting in lower vibration levels in the tunnel sidewalls compared to the track bed. However, during the phase when the closely-spaced undercrossing excavation leads to increased track irregularities, the vibration amplitudes of both the track bed and tunnel sidewalls increase to varying degrees, with a more pronounced amplification observed in the track bed. The frequency distribution of vibration source intensity at metro stations was predominantly concentrated below 200 Hz. The primary frequency range of dynamic response induced by track irregularities from closely-spaced construction was below 40 Hz. Within the 8~40 Hz range, the source intensity is positively correlated with the amplitude of track irregularities, while an amplification phenomenon is observed in the tunnel sidewalls within the low-frequency range below 8 Hz.

Key words: subway station, closely-spaced undercrossing, vibration source intensity, dynamic evolution, dynamic finite element

CLC Number:

U239.5

CAO Yang, SHI Hao, LI Jiaofeng, TAO Jing. Evolution Analysis of Vibration Source Intensity of Subway Station Under the Influence of Closely-Spaced Undercrossing[J]. Journal of South China University of Technology(Natural Science Edition), 2025, 53(7): 149-158.

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部件	重度/（kN·m^-3）	弹性模量/MPa	泊松比
土体	19	4.19	0.33
车站结构	25	28 000	0.20
下穿通道	25	30 000	0.20
冻结土	25	150	0.20