ANALYSIS OF LANDSLIDES DURING THE 1978 IZU-OHSHIMA-KINKAI EARTHQUAKE
スポンサーリンク
概要
- 論文の詳細を見る
Using the so-called pseudo-static method, a stability analysis was made for the mountain slide that took place at Mitake-iriya village at the time of the Izu-Ohshima-Kinkai earthquake of January 14,1978. Undisturbed samples of volcanic clay were obtained in blocks from the exposed surface of the deposit identified to have been the sliding surface. The partially saturated clay samples were tested under consolidated undrained conditions using the triaxial test equipment. Dynamic axial stresses with irregular time histories were applied to the specimens in combination with statically sustained axial stresses to determine the soil strength under the conditions simulating in-situ states of stress during the earthquake. The results of the tests were expressed in terms of the Mohr-Coulomb type failure criterion which showed that, while the angle of internal friction remained almost unchanged, the cohesion component in irregular loading increased above values obtained in the static loading. Using the strength parameters thus determined, a pseudo-static analysis was made to check the stability of the soil masses that had actually slid during the 1978 earthquake. The maximum horizontal acceleration required to cause the slide was computed. The computed accelerations were shown to cover a range between 400 and 500 gals which is consistent with the range estimated by other investigators on the basis of overturning of tombstones in the vicinity of the slide area.
- 社団法人地盤工学会の論文
- 1983-03-15
著者
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石原 研而
Civil Engineering, University of Tokyo
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石原 研而
Department Of Civil Engineering Chuo University:department Of Civil Engineering Tokyo University Of
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石原 研而
Civil Engineering University Of Tokyo
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石原 研而
Department Of Civil Engineering Science University Of Tokyo 2641 Yamazaki Noda Chiba 278-0022.
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長尾 哲
Japan Highway Public Corporation Niigata Construction Bureau.
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Ishihara Kenji
Department Of Civil Engineering Chuo University
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