莲花水电站大坝基础灌浆施工的质量控制

Quality control in the grouting of dam foundation in Lianhua Hydropower Station

莲花水电站帷幕轴线位于趾板中部；其中已灌部位处于基岩强风化带下部和弱风化带上部。为保证灌浆质量，施工后对已灌部位进行了质量检测。检测结果表明，经过固结灌浆和帷幕灌浆，在基础有效深度内只存在弱透水带和微透水带，透水率小于３Ｌｕ，满足设计要求，平均渗透坡降计算结果表明，面板下游以堆石为骨架的填料是良好排水体，不会产生渗透稳定问题。

The grouting curtain axis of Lianhua Hydropower Station is located in the middle of the plinth,among which the grouted part lies in the lower part of strong weathered zone and the upper part of weak weathered of the bedrock.In order to ensure the grouting quality,the quality check for the grouted part has been made after the construction.The check results show that after the completion of consolidation grouting and curtain grouting,the effective depth of the foundation only exists some weak or little pervious zones with the permeability of less than 3 Lu,which can meet the design requirements.The calculation results of average seepage gradient shows the filled material in the downstream of the face slab is a very good drainage body which cannot cause seepage stability problem.