In order to study the dynamic response of adjacent buildings in the
process of tunnel blasting excavation, taking Yangjia tunnel blasting
through a five-story frame structure residential building as an example,
the propagation law of blasting seismic wave was analyzed by using HHT
method through on-site blasting monitoring. Then, the ALE algorithm in
ANSYS/LS-DYNA software was used to establish a three-dimensional
numerical model based on the surrounding rock-cutting section-structure
coupling to study the dynamic response of adjacent buildings under the
blasting vibration of tunnel. The results show that the HHT analysis
method can clearly describe the energy distribution of vibration signals
in the time and frequency domain. The energy carried by the blasting
vibration signal is corresponding to the detonating section, and the
maximum energy appears in the cutting section, which further verifying
that the vibration effect caused by the cutting hole blasting is the
strongest. In the process of tunnel blasting, the dynamic responses of
beams, columns and exterior walls of adjacent buildings are not
consistent and show different variation rules along the height
direction. In addition, the stress centralization mainly occurs in the
exterior wall of the building, the joint of the exterior wall and the
column, the joint of the exterior wall and the beam, and the joint of
the exterior wall and the floor and other non-weight bearing area,
indicating that these parts are more likely to damage and crack in the
process of tunnel blasting.
A Study on Dynamic Response of Tunnel Blasting Beneath Surface Buildings
