| 摘要 |
PROBLEM TO BE SOLVED: To form an water-stopping layer having a high performance at a low manufacturing cost. SOLUTION: A mixed soil is prepared by using a dehydrated cake as a viscous soil and mixing the viscous soil with the excavated soil of a crushed stone with a maximum particle diameter of not more than 30 mm as gravel material so that the blending ratio of fine particles which are smaller in a size than that of silt is set within the range of a weight ratio of 55 to 65%. The water-stopping layer is formed by compacting the mixed soil at a degree of compacting of not less than 95%. Following this procedural step, a cement curing material is added to the mixed soil at a blending ratio of 3 to 10% in terms of weight ratio. Next, the previously prepared mixed soil is evenly laid at the site and compacted with a tamping roller or a vibratory roller to form the water-stopping layer with a thickness of 15 to 30 cm. Finally, the water-stopping layers are sequentially piled up.
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