山东省境内水库众多,仅大中型水库就有175座,土坝多为宽心墙砂壳坝。其主要特点是:(1)坝高一般为20～30m,坝基覆盖层较薄(5～10m);(2)心墙较宽,其边坡为1:10～1:20,由粉质粘土或亚粘土组成;(3)砂壳多为未经碾压或碾压不实的粗砂,质量较差,相对密度为0.2～0.4。由于砂壳松散,抗震性能很差,于1969年渤海湾地震时,处于5～6度低烈度区的王屋、冶源、黄山三 Many reservoirs in Shandong Province, there are only 175 large and medium-sized reservoirs, earth dam mostly wide-wall sand dam. Its main features are: (1) dam height is generally 20 ~ 30m, the dam foundation cover is thin (5 ~ 10m); (2) the core wall is wide and its slope is 1:10 ~ 1:20, Clay or sub-clay composition; (3) Most of the sand crust unrolled or laminated compaction of coarse sand, poor quality, the relative density of 0.2 to 0.4. Due to the loose sand shell and poor seismic performance, in the Bohai Bay earthquake in 1969, Wangwu, Yayuan and Huangshan III