Mitigation of the seismic motion near the edge of cliff-type topographies using anchors and piles |
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| Authors: | Constantine A Stamatopoulos Maria Bassanou |
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| Institution: | (1) Stamatopoulos and Associates Co. Ltd., 5 Isavron st., Athens, 11471, Greece |
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| Abstract: | Concentration of damage of buildings near the edge of cliff-type topographies has been observed during a number of recent
earthquakes and interpreted by numerical dynamic analyses that illustrate the amplification of the horizontal acceleration
and the generation of parasitic vertical acceleration near the tip of slopes. The paper performs a detailed parametric numerical
analysis to investigate the ability of mitigating this topographic effect using anchors and piles. A typical field case, the
Aegion slope of Greece, is considered. Different input motions are applied. The results illustrated that anchors and piles
can be effective in mitigating the topographic effect. The main issue is that if the part of the slope in which topographic
amplification occurs is connected to that at larger depths, in which the acceleration is smaller, then the accelerations at
the top of the slope have to become more uniform and smaller. For typical diameter and material properties of anchors/piles
the effectiveness of the mitigation depends on the length, inclination, location and number of anchors/piles. An optimum configuration
of anchors/piles mitigating the topographic effect is proposed. |
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| Keywords: | Cliff-type topographies Numerical analyses Anchors Piles Mitigation 2D Wave propagation Site effects |
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