| 摘要(英) |
Taiwan is located at the earthquake-prone boundary of the Eurasian Plate, where soil liquefaction commonly occurs during large earthquakes. This phenomenon can cause severe
settlement and tilting damage to bridge foundations, compromising bridge functionality or even leading to collapse. Such liquefaction-induced damage is most likely to occur in bridge piers with shallow foundations seated on liquefaction-prone soils. In Taiwan, many bridge piers were
constructed with shallow foundations on liquefiable soils without considering the effects of liquefaction during design. As seismic design codes have significantly increased the required design forces, reassessment of these structures′ seismic resilience has revealed that the impact
of soil liquefaction cannot be overlooked. Consequently, consulting firms have implemented an anti-liquefaction measure to enhance the seismic performance of these bridge foundations by installing diaphragm walls around shallow foundations to prevent soil loss. However, the effectiveness of this anti-liquefaction strategy remains debated, and few experimental studies have addressed this issue.
To this end, this study plans a series of centrifuge model tests to verify the anti-liquefaction seismic behavior of bridge piers with shallow foundations surrounded by diaphragm walls. A bridge pier with a shallow foundation without diaphragm walls will be used as a standard
reference. The study will assess the effectiveness of the underground wall by varying the wall’s penetration depth and examining whether it is rigidly connected to the foundation slab.
The test results indicate that diaphragm walls can effectively mitigate settlement and tilting damage to bridge foundations during soil liquefaction. Additionally, the walls influence the generation and dissipation of excess pore water pressure, thereby enhancing the stability of
bridge foundations. Greater improvement in stability is observed with deeper wall penetration and rigid connection to the foundation slab. |
| 參考文獻 |
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