| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for improving soft ground under permeable upper ground, which is used for improving the soft ground with a surface layer section including the permeable upper ground. SOLUTION: A drain material 10 is inserted into the soft ground 2, existing between a lower permeable base layer 4 and the permeable upper ground 7 existing in a ground surface section, from a ground surface. The drain material 10 is equipped with a removed part 14, the length of which is greater by a predetermined length c than the depth of the permeable upper ground, and a permanently embedded part which is disconnectably connected to a lower end of the removed part 14; and the removed part 14 is equipped with an impermeable part 50 for preventing the intrusion of water into the permeable upper ground. A lower end of the permanently embedded part of the drain material 10 is inserted up to a desired improvement depth which does not reach the depth of the base layer 4; desired soil improvement is performed by discharging soil pore water in the soft ground 2 through an upper end of the drain material 10; and after that, the removed part 14 of the drain material is removed from the ground surface. COPYRIGHT: (C)2006,JPO&NCIPI
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