| 摘要 |
PROBLEM TO BE SOLVED: To provide a vacuum consolidation method capable of applying a negative pressure to weak clay to be disposed for obtaining a sufficient consolidation dewatering effect, and capable of economically performing consolidation dewatering.SOLUTION: An inventive vacuum consolidation method is a vacuum consolidation method for dewatering improvement object soil in a high water content state by vacuum consolidation. The method includes: a step S02 of laying water-impervious sheets on a bottom surface and side faces of a disposal field; a step S03 of forming a sand mat in which drain materials with caps are horizontally embedded on the bottom surface; a step S04 of depositing the improvement object soil in a high water content state on the sand mat; a step S07 of applying a negative pressure to the improvement object soil through the drain materials with caps to perform the vacuum consolidation; a step S08 of excavating the vacuum-consolidated improvement object soil; and a step S10 of cleaning the inside of the drain materials with caps. After the cleaning step, the depositing step and the vacuum consolidation step are repeatedly performed for a new improvement object soil in a high water content state. |
