81001292

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サクキョガタ ハイスイロ テイメン ニオケル シントウ ハカイ ジレイ ト ホウコク

Seepage failure of bottom soil within double sheet-pile- wall-type ditch - A case history and site investigation -

Japanese (日本語)

神戸大学都市安全研究センター研究報告

12

231-244

神戸大学都市安全研究センター

2008-03

2009-06-18

Boiling occurred at the bottom soil within boudle sheet-pile-wall-type ditch (or prefabricated ditch) during puddling and the ditch border collapsed. After the bottom of the ditch was covered with a concrete slab, boiling still occurred when there was heavy rain and during certain activities such as puddling and transplanting rice seedling. Resistance against seepage failure of the bottom soil is based on how deeply sheet-pile walls (or panels in this case) are installed. In this case, the penetration depth was so small that the bottom soil of the ditch was unstable when the groundwater level increased. Changes in the groundwater level were observed continuously from 2003/12/05 to 2004/04/03. The data show that the groundwater level increases with rainfall, and the increase in the groundwater level was large during certain activities such as puddling and transplanting. The largest hydraulic head difference, H, during the continuous observation period was 0.212m on 2003/12/12. On intermittent observation, the H values were 0.600m on 2004/05/16 after heavy rain and 0.456m on 2004/05/22 during puddling. The greatest H value at the time of transplanting was estimated as 0.878m on 2004/05/24, when boiling failure occurred.

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