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小浪底水库坝址处河床覆盖层最深达70余米,采用混凝土防渗墙控制强透水地基的渗流。按三维渗流计算结果表明:防渗墙出现裂缝的位置越高,防渗墙下游心墙底部的相对水头越大,裂缝靠心墙底部最危险,因此,确保心墙与防渗墙连接处的施工质量至关重要;防渗墙出现裂缝开度小于0.3cm时,对渗流场的影响不大,防渗墙下游心墙底部最大相对水头值仅为2.02％;防渗墙完好,上游天然淤积铺盖没有明显防渗作用,只有当防渗墙出现裂缝或开叉时,淤积铺盖的防渗作用才比较明显。
Xiaolangdi reservoir dam site at the deepest river bed cover more than 70 meters, the use of concrete cutoff wall control seepage pervious to permeable foundation. According to the three-dimensional seepage calculation results, it is found that the higher the position of the crack-proof wall is, the bigger the relative head at the bottom of the core wall is and the fissure is most dangerous at the bottom of the core wall. Therefore, The construction quality is very important. When the opening of the cutoff wall is less than 0.3cm, the influence on the seepage field is insignificant, and the maximum relative head at the bottom of the core wall is only 2.02%. The impervious wall is intact, No significant seepage barrier effect, only when the cut-off wall cracks or open fork, silt cover seepage effect is more obvious.