| 摘要 |
PROBLEM TO BE SOLVED: To provide a blasting compaction method in which ground constituting particles are compacted at higher density, and which prevents the generation of a ground loosening phenomenon in or around blast holes. SOLUTION: In this blasting compaction method, the many blast holes 4, 4 and 4 are formed at predetermined intervals in the ground, and explosives are inserted and installed in predetermined-depth positions of the blast holes 4, 4 and 4, and fired so that the ground can be compacted. Separately from the blast holes 4, many wells 1 for discharging pore water are provided in positions deep enough to reach a lower section of a soil improvement target layer G<SB>I</SB>, or positions deep enough to pass through the layer G<SB>I</SB>and reach a ground layer G<SB>P</SB>on the downside of the layer G<SB>I</SB>, and a forced water discharge means 3 which restricts a water suction section 2a is installed near the lower section of the well 1. In explosion, water is discharged by the means 3. Thus, in the layer G<SB>I</SB>, the pore water is discharged while being guided downward, and increased pore water pressure is dissipated. COPYRIGHT: (C)2007,JPO&INPIT
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