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Borehole Strainmeter Installation in Japan

Borehole Strainmeter Installation in Japan. As told to E. Roeloffs by Dr. Y. Kitagawa and Dr. N. Matsumoto, Geological Survey of Japan. General procedure. Immediately after drilling hole, open-hole installation interval is filled with grout

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Borehole Strainmeter Installation in Japan

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  1. Borehole Strainmeter Installation in Japan As told to E. Roeloffs by Dr. Y. Kitagawa and Dr. N. Matsumoto, Geological Survey of Japan

  2. General procedure • Immediately after drilling hole, open-hole installation interval is filled with grout • Grout is allowed to cure, then the hole is reamed and the core retained for inspection • Hole is packed off and fluid pressure is monitored overnight. Pressure change must be less than a certain value for installation to proceed • If grout core is unsatisfactory or pressure change is too great, interval is re-filled with grout and the procedure is repeated • Final installation is done with a thin grout for an extended working time of 24 hours

  3. TYS: Core from first grout job

  4. TYS: Core from second grout job

  5. TYS: Satisfactory core from fourth grout job

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