地すべり粘性土の一面せん断試験における破壊の伝播過程

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  • Failure Propagation Process in a Landslide Cohesive Soil Subjected to Direct Shear
  • ジスベリ ネンセイド ノ イチメン センダン シケン ニ オケル ハカイ ノ

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The propagation processes of the failure plane in clay specimens, kaolin HA, bentonite, and the Yonaihata landslide clay, were detected using a new technique with constant volume direct shear tests. Before the shearing experiments, several pieces of “sohmen” coated with electro-conductive paints were inserted perpendicularly to the specimen in a line, and direct electric currents of 5V were applied to the electrodes. The electrodes were softened by absorbing soil moisture, and then can be deformed in the same manner with the clay specimen.<BR>The electrode's voltage sudddenly reduced to about OV with increasing the displacement of the specimen during the shear process. Soft X-ray photography revealed that this sudden voltage drop can be attributed to the shear zone formation at the electrode position in the specimen.<BR>The failure plane appeared in the stage of post-peek strength, and propagated into the inside from the margin of the specimen. The relationship between the failure propagation rate and the consolidation pressure of clay specimens varied with the clay types (clay minerals, physical properties of soil etc.). The results suggest that this method can provide an experimental background for landslide prediction.

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  • 地すべり

    地すべり 29 (4), 9-17_1, 1993

    公益社団法人 日本地すべり学会

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