| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method can prevent the collapse of porous walls when tests are executed under condition of fresh water in the hole of a borehole excavated in the ground through the use of a slurry and provide a casing used for the same and a testing method executed in the hole in which the method is executed. Ž<P>SOLUTION: The method for preventing the collapse of porous walls when tests are executed under condition of fresh water in the hole of a borehole 20 excavated in the ground through the use of a slurry is provided with a casing installation process S10 for inserting the casing 10, which is provided with a steel pipe 12 and a freely expanding and contracting packer 14 provided for the external circumference of the steel pipe 12, into a prescribed depth in the hole of the borehole 20; a packer expansion process S20 for expanding the packer 14, which is provided for the casing 10 inserted in the hole of the borehole 20, in such a way as to come into tight contact with the hole wall of the borehole 20: and a substituting process S30 for substituting slurries below and inside the steel pipe 12 with fresh water by an expanded packer 14. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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