| 摘要 |
PURPOSE:To reduce the cost of construction work by a method in which imperfect cut-off zones for forming a core are constructed for each section over the heightwise direction, and a water-impervious geotextile cut-off film is made to cover the slope and top of each section. CONSTITUTION:The first stage section 1A for imperfect cut-off zone is constructed, and sections 2A and 3A for the first stage semi-water permeable zone 2 and water permeable zone 3 are constructed on the downstream side. A geotextile cut-off film 4 is covered on the slope and top of the section 1A, and sections 2A and 3A for the first stage semi-water permeable zone and water permeable zone are constructed on the upstream side of the section 1A. The second stage section 1B is constructed on the section 1A, and sections 2A and 3B for the second stage semi-water permeable zone and water permeable zone are constructed on the downstream side. The film 4 is covered on the slope and top of the section 1B, and its lower end is partly lapped with the film 4 of the section 1A. The second stage semi-water permeable zone and water permeable zone section is constructed on the sections 2A and 3A on the upstream side of the section 1B. The same processes are repeated in order. |
