| 摘要 |
PROBLEM TO BE SOLVED: To provide a ground excavating method which contributes to improved excavation efficiency while avoiding the subsidence of the peripheral ground. SOLUTION: An earth retaining wall 10 is constructed at the time of the excavation of the ground. Before or after, or in tandem with the construction of the wall 10, an outer peripheral wall 14 is formed at a location spaced a predetermined interval away from the wall 10. The outer peripheral wall 14 partially has an aquiclude portion 18 corresponding to a sandy soil stratum 16a in the ground 16. When the formation of the outer peripheral wall 14 is completed, a discharge well 20 is formed in the ground at a location between the wall 10 and the outer peripheral wall 14, and a condensate well 28 at a location outside the outer peripheral wall 14, respectively. Groundwater pumped up from the well 20 is fed to the condensate well 28, and then returned to the ground 16 via the well 28. When the discharge of pumped groundwater is started by the pumped well 20, the inside of the earth retaining wall 10 is excavated, and when the excavation reaches a preset excavation surface 12, the excavation is completed. COPYRIGHT: (C)2005,JPO&NCIPI
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