2018年北海道胆振東部地震により被災した北広島市大曲並木地区の地下水位低下工法を用いた滑動崩落対策の効果検証

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  • Verification of the effectiveness of the groundwater level lowering method in the Omagari Namiki district of Kitahiroshima City, which was damaged by the 2018 Hokkaido Eastern Iburi Earthquake
  • 2018ネン ホッカイドウ イブリ トウブ ジシン ニ ヨリ ヒサイ シタ キタヒロシマシ タイキョク ナミキ チク ノ チカ スイイ テイカ コウホウ オ モチイタ カツドウ ホウラク タイサク ノ コウカ ケンショウ

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During the 2018 Hokkaido Eastern Iburi Earthquake, a sliding collapse of residential land occurred in the Omagari Namiki district of Kitahiroshima City. In this area, the groundwater level lowering method was adopted as a countermeasure against sliding collapse. Since the distribution of the humus soil layer was confirmed in the previous year’s survey, consolidation settlement due to the lowering of the groundwater level was assumed, so the groundwater level was lowered in stages to prevent uneven settlement. Regarding the effect of countermeasures against sliding collapse due to lowering of the groundwater level, we examined whether the target safety factor is secured by ground failure analysis using the maximum water level of the groundwater level after countermeasures. As a result of the analysis, it was confirmed that the target safety factor was ensured in all cross sections to be examined, and it was determined that the countermeasures were effective.

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