DYNAMIC STABILITY ANALYSIS OF HIGH EARTH-ROCKFILL DAM ON THICK MORAINE COVER FOUNDATION
深厚覆盖层上高土石坝的动力稳定分析

To build high earth-rockfill dam on thick moraine cover foundation in high earthquake intensity region will face many new problems such as dynamic stability,dam foundation liquefaction etc. As an example, three-dimensional dynamic consolidation FEM is employed to analyze the reaction of high earth-rock fill dam with clay core and cat-off wall. The dynamic stability is researched. An equivalent quasi-elastoplastic constitutive model which can express nonlinear viscid and un-recoverable deformation of soil is employed in the new dynamic consolidation FEM,while dynamic pore water pressure model is abandoned. The generation,diffusion and scatter of dynamic pore water pressure in a complete earthquake process are tracked. It is a real coupling of dynamic seepage and dynamic reaction. The calculation results show that the static stress and displacement of the dam on thick moraine cover foundation are bigger;the dynamic stress,displacement and acceleration are smaller;the ratio of pore water pressure in the dam base is smaller than the dam on rock foundation. The dam is safe.