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1坝址区工程地质燕山水库主坝全长4070m,根据坝轴线地质纵断面图,按地形地质条件可分为左岸台地坝段、河槽及残留一级阶地段和右岸坝肩段。坝基的主要工程地质问题是坝基渗漏及渗透稳定问题。左岸台地坝段桩号0+650～4+275,长3625m,基岩为第三系粘土质砂岩和粘土质砂砾岩,粘土质砂砾岩属弱～中等透水,粘土质砂岩绝大部分属极微透水～弱透水,二级阶地段(?)地层
1 dam site engineering geology Yanshan Reservoir main dam full length 4070m, according to dam geological longitudinal section view, according to the topography and geology conditions can be divided into the left bank terrazzo dam, river channel and residual first-order section and right bank dam section. The main engineering geological problems of the dam foundation are the problems of seepage and stability of the dam foundation. The stratum of the platform section of the left bank of Taiwan Strait is 0 + 650 ~ 4 + 275 and 3625m long. The bedrock is Tertiary clayey sandstone and clayy conglomerate. The clayey sandy conglomerate is a weak to moderately permeable water. Most clayey sandstones are extremely polar Micro-permeable ~ weakly permeable, second-order stage (?) Formation