| 摘要 |
PROBLEM TO BE SOLVED: To obtain a repeatedly usable stabilization liquid for excavation hard to run septic and having high resistance to cement contamination by including water and a polymer with a specified weight-average molecular weight made by polymerization of a monomer component essentially containing methyl acrylate. SOLUTION: This stabilization liquid comprises water and a polymer with a weight-average molecular weight of >=100,000 made by polymerization of a monomer component essentially containing pref. 20 wt.% of methyl acrylate; wherein it is preferable that the polymer has carboxyl group, this liquid additionally contain clay mineral, and the ground is drilled using this liquid while preventing the inner wall surface of a drilled hole from collapse.
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