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A platform for research: civil engineering, architecture and urbanism
Centrifuge Modeling of Liquefaction Remediation at Bridge Sites
Many bridges at river sites in California are founded on poor soil conditions which may be susceptible to liquefaction and large deformations during an earthquake. The primary was to conduct model tests to help evaluate the extent of soil improvement required to mitigate the consequences of liquefaction. The first phase involved completion of a very large centrifuge-based servo-hydraulic shaking table. This table can shake 2700 kg payloads with 15 to 25 g shaking accelerations while the centrifuge provides up to 53 g steady accelerations to the physical models. This facility is available for future studies. Five centrifuge models of a hypothetical 'river' site were tested. The models simulated a sloping 9 m thick liquefiable sand layer covered by sloping clay 'floodplane'. In two of the tests, a 7 m wide, full depth section of this liquefiable sand was densified. The improvement effectively controlled settlements, but resulted in relatively minor reductions in the lateral sliding of the clay. The apparent shear resistance of the liquefiable soil was back-calculated from one-way and two-way sliding block analyses. Additional testing is needed to evaluate the effectiveness of different extents and different types of soil improvement.
Centrifuge Modeling of Liquefaction Remediation at Bridge Sites
Many bridges at river sites in California are founded on poor soil conditions which may be susceptible to liquefaction and large deformations during an earthquake. The primary was to conduct model tests to help evaluate the extent of soil improvement required to mitigate the consequences of liquefaction. The first phase involved completion of a very large centrifuge-based servo-hydraulic shaking table. This table can shake 2700 kg payloads with 15 to 25 g shaking accelerations while the centrifuge provides up to 53 g steady accelerations to the physical models. This facility is available for future studies. Five centrifuge models of a hypothetical 'river' site were tested. The models simulated a sloping 9 m thick liquefiable sand layer covered by sloping clay 'floodplane'. In two of the tests, a 7 m wide, full depth section of this liquefiable sand was densified. The improvement effectively controlled settlements, but resulted in relatively minor reductions in the lateral sliding of the clay. The apparent shear resistance of the liquefiable soil was back-calculated from one-way and two-way sliding block analyses. Additional testing is needed to evaluate the effectiveness of different extents and different types of soil improvement.
Centrifuge Modeling of Liquefaction Remediation at Bridge Sites
A. Balakrishnan (author) / B. L. Kutter (author) / I. M. Idriss (author)
1998
74 pages
Report
No indication
English
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