フィルダムの地震時における水理破壊現象に関する研究

Abstract

In addition to the safety against sliding failure of embankment slopes, safety against internal erosion caused by hydraulic fracturing has been another important issues to be discussed in the seismic resistant design of fill*type dams. This paper concerns the mechanism and its possibility of occurrence of hydraulic fracturing in earth and rock fill dams during earthquake. Laboratory seepage fracture tests were conducted on erosive soils under various conditions of water pressure and confining stresses to know what are to be influential factors on seepage failure, and FEM dynamic response analysis was made for different cases of embankment configuration to study the extent of damages and development process of hydraulic fracturing during earthquake.