EFFECTS OF SAND PERMEABILITY AND WEAK AFTERSHOCKS ON EARTHQUAKE-INDUCED LATERAL SPREADING

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概要

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• Centrifuge research conducted at Rensselaer Polytechnic Institute (RPI) is summarized focusing on the effect of sand permeability and of weak aftershocks on earthquake-induced lateral spreading. One-dimensional shaking tests were conducted in a laminar box at a centrifugal acceleration of 50 g, simulating a 10 m thick homogeneous layer of clean Nevada sand of relative density 40-45% inclined a few degrees to the horizontal. Seven centrifuge experiments were done using either water or a viscous pore fluid fifty times more viscous than water, thus varying the soil permeability by a factor of fifty and simulating either a coarse prototype sand or a fine sand in the field. These seven tests were subjected to the same shape of base input excitation but with peak input accelerations ranging from 0.18 g to 0.46 g between tests. An additional special centrifuge test of a similar model with viscous pore fluid was subjected to a strong base "main shock", followed after a few seconds by two "weak aftershocks". Excess pore pressures, accelerations, settlements and lateral ground deformations were measured. The results are discussed in detail and several correlations are presented between testing and measured parameters such as thickness of liquefied soil, ground surface settlement, lateral ground displacement and input peak acceleration. The results of the special test, together with other evidence, provide strong support to the hypothesis that reported continued ground deformations from lateral spreads in the field are often caused by continued weak vibration or aftershocks occurring after the main shock.

• 社団法人地盤工学会の論文
• 2001-12-15

著者

• 岡村 未対

  Senior Research Engineer, Public Works Research Institute

• Sharp Michael

  Director Of Centrifuge Research Center Wes.

• Dobry R

  Prof. Ditto.

• OKAMURA MITSU

  Senior Researcher, Public Works Research Institute.

• ABDOUN TAREK

  Research Assistant Prof., Rensselaer Polytechnic Institute.

• DOBRY RICARDO

  Prof., ditto.

• TABOADA VICTOR

  Research Assoc., Instituto de Ingenieria. Manuscript was received for review on September 11, 2000.

• Abdoun Tarek

  Research Assistant Prof. Rensselaer Polytechnic Institute.

• Taboada Victor

  Research Assoc. Instituto De Ingenieria. Manuscript Was Received For Review On September 11 2000. Wr

• Okamura M

  Public Works Res. Inst. Tsukuba City Jpn

関連論文

• EFFECTS OF FOOTING SIZE AND ASPECT RATIO ON THE BEARING CAPACITY OF SAND SUBJECTED TO ECCENTRIC LOADING
• EFFECTS OF SAND PERMEABILITY AND WEAK AFTERSHOCKS ON EARTHQUAKE-INDUCED LATERAL SPREADING

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