LU Yunhua1, LI Sheng1, CHEN Zhigang1, ZHANG Ke2, ZHENG Wei3, YI Diqing3
Journal of Vibration and Shock. 2026, 45(4): 210-220.
The high-fill open cut tunnel structure traverses the mountainous area of gully and valley, and then achieves the integration of airport, high-speed railway and urban rail transit through backfilling. In order to clarify the dynamic response characteristics of vibration compaction around the open cut tunnel structure, this paper adopts a combination of field test and numerical simulation to analyse the acceleration response and safety factor of the open cut tunnel structure. The results show that: for the backfill soil, its compaction effect is positively correlated with the thickness of the false pavement and the number of rolling times, and the ideal compaction effect can be achieved by rolling 6 times; for the open cut tunnel structure, in the process of vibration load moving on both sides of the structure, the transverse and vertical acceleration attenuation law is similar, and the transverse acceleration is more prominent than the vertical acceleration response, and the percentage of the transverse acceleration attenuation for each working condition is 63.4%,57.1%,41.3%和24.8%, the average attenuation rate of vibration wave in the soil is about 8.2%/m; the top of the structure is the vertical acceleration response is more obvious, the peak acceleration of vibration with the increase of the filling height and decrease, large vibratory roller acceleration attenuation presents a non-linear law, the maximum attenuation of a single machine is about every 10cm attenuation of 110mm/s2, the double machine about 142, that is to say, the dissipation of vibration energy propagation by filling medium is gradually enhanced with the change of filling height, and the friction energy dissipation between soil particles is significantly enhanced with the increase of filling thickness and the prolongation of vibration wave propagation path; the error of numerical analysis and field test for each working condition is basically within 10%, and the negative impact of vibration response has obvious spatial limitation, which mainly focuses on the structure nearer to the vibration source. The negative impact of vibration response has obvious spatial limitation, which mainly affects the structure closer to the vibration source. For the structural parts farther away from the vibration source, the structural safety coefficient basically stays unchanged or changes very little at the moment of the vibration peak, which indicates that the vibration energy attenuates rapidly with distance. This study can provide a reference for similar projects.
