ZHANG Hanwen,JIANG Liangwei,DU Meiling,et al.Exploration on Selection of the Most Unfavorable State for Seismic Stability Calculation of Gravity Retaining Walls[J].Journal of Disaster Prevention and Mitigation Engineering,2024,44(02):372-380.
ZHANG Hanwen,JIANG Liangwei,DU Meiling,et al.Exploration on Selection of the Most Unfavorable State for Seismic Stability Calculation of Gravity Retaining Walls[J].Journal of Disaster Prevention and Mitigation Engineering,2024,44(02):372-380. DOI: 10.13409/j.cnki.jdpme.20221115003.
Exploration on Selection of the Most Unfavorable State for Seismic Stability Calculation of Gravity Retaining Walls
The selection of the most unfavorable state in the overall stability calculation of gravity retaining walls has an important influence on seismic design. Shaking table model tests were used to reveal the differences in seismic earth pressure values at three critical seismic moments for retaining walls
namely
peak acceleration
peak outward rotation of the wall
and peak displacement at the top of the wall. Also
an evaluation of the envelope method
commonly used to select values at the peak earth pressure moment
was conducted. Based on the seismic response calculations of gravity retaining walls by the ABAQUS finite element model
the differences in earth pressure values at the back of the wall and the overall stability calculation results at each critical moment were analyzed
and the most unfavorable state in seismic stability calculation was proposed. Research showed that: (1) With the increase of peak ground acceleration and wall height
the seismic earth pressure at the three critical moments all showed a transition from a non-linear distribution to an approximately equilateral triangular pattern. The combined earth pressure and the height of its action point were
on average
49% and 18% greater
respectively
than those in the current seismic design codes.(2) Due to the inability of peak envelope method to reflect the active/passive state of wall-soil motion and the seismic wave propagation delay
the earth pressure values near the top of the wall were overly high
and the combined seismic earth pressure was twice as large as that at the critical moments
with the action point about 25% higher. (3) The anti-slide stability coefficient at the moment of peak wall outward rotation was 14%~33% smaller than the other two
and the sensitivity to attenuation was more obvious with the increase of peak ground acceleration. Therefore
selecting the critical moment of peak wall outward rotation as the most unfavorable state in seismic stability calculation is deemed to achieve a balance between structural safety and cost-effectiveness.
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