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Study on Strengthening Scheme for Box Dam of Dongping Lake

DING Yi;DONG Hai-zhao;LIU Jie;Yellow River Engineering Consulting Co., Ltd.;Yellow River Institute of Hydraulic Research;  
The preliminary strengthening scheme for box dam of Dongping Lake,taking the wall depth of 22m as the boundary,proposed a deep soil cement mixing pile cut-off wall for the embankment section with wall depth within 22m;a vibroflotation anti-seepage plate cut-off wall for the embankment section with wall depth between 22~27m; and a concrete cut-off wall for the embankment section with wall depth over 27m. During the construction, it was relatively difficult in construction with vibroflotation anti-seepage plate cut-off wall and concrete cut-off wall, and the construction cost was high; even normal construction could not be guaranteed where irregular underground obstacles and calcareous concretion stratum were encountered. Thus the embankment section with the cut-off wall depth over 22m and with underground obstacles should be optimized. According to analysis and study, the soil cement cut-off wall by soil cement deep mixing and high pressure jet grouting, which brings low construction cost and better economic benefits and leads to a solution of such problems of Yellow River embankment as failure to handle the deep stratum by the soil cement mixing pile, unfavorable foundation, poor adaptability and high cost for high pressure swing jet grouting cut-off wall,is determined to be applied.
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