LU Chuanlei,XUE Minghua,HU Wenkui,et al.Dynamic Response Characteristics and Safety Control of Brick Masonry Walls Adjacent to Foundation Pit Blasting[J].Journal of Disaster Prevention and Mitigation Engineering,2026,46(02):409-418.
LU Chuanlei,XUE Minghua,HU Wenkui,et al.Dynamic Response Characteristics and Safety Control of Brick Masonry Walls Adjacent to Foundation Pit Blasting[J].Journal of Disaster Prevention and Mitigation Engineering,2026,46(02):409-418. DOI: 10.13409/j.cnki.jdpme.20240925002.
Dynamic Response Characteristics and Safety Control of Brick Masonry Walls Adjacent to Foundation Pit Blasting
Controlling the vibration effects of foundation pit blasting is of great significance for ensuring the safety and stability of adjacent brick masonry structures. Based on a foundation pit blasting project of a subway in Wuhan
field tests and ANSYS/LS-DYNA numerical simulations were adopted to investigate the dynamic response characteristics of brick masonry walls adjacent to foundation pit blasting. Based on the principle of dimensional analysis
a blasting vibration prediction model was established
and a safety standard for blasting vibration of brick masonry walls was proposed. The results showed that the established numerical model results were consistent with the field test results and could be used for analyzing the dynamic response under blasting. The lower-order mode shapes of the brick masonry walls were transverse or longitudinal bending
while under higher-order modes
they exhibited coupled transverse and longitudinal bending. The dynamic response on the blast-facing side of the brick masonry walls was greater than on the opposite side
and the peak vibration velocity along the extension direction of the wall occurred at the ends
the middle
or near the middle
and changed with height. The blasting vibration of the brick masonry walls exhibited an elevation amplification effect
which was more significant at locations farther from the blasting source
and the stress in different directions showed the characteristics of higher stress in the middle and lower stress at both ends. Increasing the wall height and excavation depth caused the locations of significant elevation amplification effects and stress concentration to shift from the center of the wall toward both ends. A blasting vibration prediction model was established
and combined with the ultimate strength theory
the safe blasting vibration velocity of brick masonry walls was determined to be 2.42 cm/s. A calculation formula for the safe charge of blasting was proposed
which can be applied to foundation pit blasting design.
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