Some questions such as disqualification dam

many cracks in developing dam body

disperse-impregnation in the downstream slope of dam

forming ascending spring owing to marshization in dam back

wadding educts coming from drainage ditch and rearing pond and a lot of seepage amount were occurred. These abnormal phenomena were brought by the seepages in the body and foundation of dam. On the circumstances of describing the dam body

foundation geological and hydrogeological conditions

cause of formation of the dam seepage and seepage stability of the dam were analyzed. It is pointed out that the actual saturation line and seepage amount of dam body were abnomal. Especially

the reservoir level was beyond 194 m after 1987

that compared with beforetime

it was abnomal that the identical reservoir level tended to go up. The actual seepage quantity of the dam foundation was unconventional

there were the questions of piping of the highly permeable layer and contact erosion

especially

the reservoir level was under 193.84 m

sand boil in ascending spring behind dam appears. Therefore

the seepage of dam was dangerous. The reasons of formation of dispersed-impregnation and exudates in dam

ascending spring

marshization

the seepage of shoulder and by-pass dam were analyzed.