Abstract:In view of the synchronous trend change of NS and EWcomponents of Tonghai vertical pendulum since April 2019, we calculate the M2 wave tidal factor of NS and EW components from 2017 to 2020. Combined with the structural data of underground media such as monitoring wells, we construct three-dimensional finite element physical models of vertical stratification of Tonghai station. We quantitatively analyze the differential characteristics of the influence of building load on NS and EW displacement under different rock parameter models. The results show that: 1) Since April 2019, the N-tilt variation of NS component reaches about 2 750 ms, while the E-tilt variation of EW component reaches about 580 ms. The trend variation of NS component is significantly bigger than that of EW component. 2) From 2017 to 2020, the M2 wave tidal factor of NS and EW components are relatively stable, in which the NS component fluctuates around 0.7 and the EW component fluctuates around 0.52. The trend break of data fails to cause synchronous change in the tidal frequency band. 3) The hospital building load located in the northeast of Tonghai station generates N-direction and E-direction displacement, which is consistent with the N-tilt and E-tilt trend break of vertical pendulum after April 2019. The simulated N-tilt displacement is about 3 times of E-tilt displacement.
YUE Chong,LI Libo,YAN Wei et al. Study on Numerical Simulation of the Vertical Pendulum of Tonghai Station Influenced by Building Loads[J]. jgg, 2022, 42(9): 985-990.