向家坝纵、横向围堰均需修建在深厚覆盖层之上，如何选择技术经济性合理的地基处理方案关系到工程导流的成败。经反复研究比较，堰基深厚覆盖层处置确定采用由10个沉井组成的大型沉井群处理方案。侧重介绍了沉井群平面布置、结构设计和地下渗流控制方案，并且针对井间间距小、下沉深度大、覆盖层深厚及含大孤石地层差异性大等复杂条件，提出了沉井群下沉施工优化处理措施，将堆石混凝土施工技术应用于沉井填芯，取得了较好的工程经济技术效果。%The longitudinal cofferdam of Xiangjiaba Hydropower Station was built on deep overburden layer , therefore the se-lection of reasonable foundation treatment scheme was the key for the smooth construction diversion .After repeated comparison -selection and research , the large sinking well group composed of 10 sinking wells was determined .Through innovating the design concept of sinking well group , the thought of large sinking well with small interval was put forward and in the combination of the practical condition , the plane arrangement , structural design , underground seepage control were suggested .Aiming at the com-plicated conditions of small well interval , large sinking depth , thicker overburden layer , large difference of stratums containing big boulder , the optimized sinking construction measures were proposed .The rock filled concrete was applied to fill the sinking well, thus satisfactory technological and economical effects were obtained .
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