MECHANICAL SIMPLE INSPECTION FLOW OF PIPING RISK OF RIVER LEVEES AND EFFICIENT CONDITION OF LEAKAGE COUNTERMEASURE TYPE FLOOD CONTROL METHOD

Abstract

The relationships among the properties of levee body and foundation ground in river levee, river water level, sand boiling dynamics and piping growth rate, and pore water pressure distributions were investigated by model experiments and three-dimensional seepage analysis. The key parameters for occurrence and consequence conditions of piping were revealed: existence and location in dead-end, the inlet and layer structures properties in permeable base layer and the unevenness of inside-land. Based on mechanical mechanism of sand boiling holes in which sand particles were erupted due to the localization of pore water flow, the efficiency conditions on traditional methods in leakage control works also were proposed.