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Abstract Sand cushion and geotextile reinforcement are often used to treat soft clay foundation. Emphasis is placed on the case，a typical engineering in Baishawan—Shuikou surrounding beach in Pinghu，Zhejiang Province. Based on the nonlinear finite element analysis，requirements of permeability of sand cushion and effects on deformation and stability of embankment are studied. The effect of geotextile reinforcement and the feasibility of the low-cost blowing sand diking technology on soft soil ground are discussed. Results of FEM computation about consolidation，settlements and stability are analyzed. Associated with the in-situ data，it is suggested that the permeability parameter k of sand mat is large than 5×10－3 cm/s. Furthermore，when the permeability of sand cushion does not meet the request，the whole stability of embankment can be increased significantly by using geotextiles；and this increase depends on the style of the geotextile. It is shown that if the grain composition and permeability of sand and the style of geotextile reinforcement are selected appropriately，the blowing sand dike technology on soft soil ground is available. The conclusion can be useful in practice.
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Received: 02 March 2009
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