実堤防の調査結果に基づいた河川堤防のパイピング危険度の力学的点検フローの提案

抄録

Sand boiling dynamics, looseness and liquefaction of soils due piping growth and pore water pressure distributions in the combinations of the properties of river levee body and base ground, and river water level were discussed by performing site investigation and three-dimensional seepage analysis. The key parameters for occurrence and consequence conditions of piping were revealed: layer structures properties in permeable base layer, existence and location in dead-end and the unevenness of inside-land. Based on the survey results for levees damaged and mechanical mechanism of sand boiling holes in which sand particles were erupted due to the localization of pore water flow, an inspection flow of piping risk in river levees was proposed.