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岳城水库拦河土坝建筑在砂卵石河床与两岸黄土的地基上。右岸黄土层下为透水性极不均匀的砂卵石层,其渗透系数为40～170米/昼夜;在本段上游增建灌浆帷幕后,虽然比天然地层的渗透性减小了些,但其渗透系数仅达到1～11×10~(-4)厘米/秒,仍可能有部分渗水进入坝后,极有可能发生坝基渗透变形与沼泽化,对坝的稳定带来严重的威胁。因此,该工程采用了排水浅沟与减压井相结合的排水措施,以排除坝基渗水,减少渗透压力,控制地下水位,确保坝的安全与下游地面免遭浸没。
Yuecheng reservoir dam earth dam construction in the sand and gravel riverbed and on both sides of the loess foundation. Under the loess layer on the right bank is a highly impermeable sand-gravel layer with a permeability coefficient of 40-170 m / day and night. After the grouting curtain is added in the upper reaches of this segment, although the permeability is lower than that of the natural strata, The permeability coefficient only reaches 1 ~ 11 × 10 ~ (-4) cm / s, some seepage may still enter into the dam, and it is very likely that the infiltration and deformation of the dam foundation and swamping will bring serious threat to the stability of the dam. Therefore, the project adopted a combination of drainage ditch and relief well drainage measures to eliminate dam foundation seepage, reduce seepage pressure, control groundwater level, to ensure the safety of the dam and the downstream ground from immersion.