| 摘要 |
PROBLEM TO BE SOLVED: To provide a safe method of preventing liquefaction at a low construction cost without causing ground subsidence by settlement due to consolidation as a method of preventing liquefaction. SOLUTION: An impermeable layer is naturally or artificially formed to exist at the upper part of the ground to be prevented from liquefaction, and an injection well and a drain well reaching the ground to be prevented from liquefaction, are formed from the ground surface. Compressed gas with a pressure equivalent to the underground water pressure is injected into the ground to be prevented from liquefaction, from the injection well, and underground water is eliminated from the drain well without lowering the underground water level of the impermeable layer existing in the lower part of the ground to be prevented from liquefaction. The injection of the compressed air from the injection well is then stopped, and the underground water eliminated from the drain well is returned into the ground to be prevented from liquefaction, through the injection well to lower the saturation degree of the ground. COPYRIGHT: (C)2004,JPO
|
