[SCG67-03] Expected stress changes in bedrock due to backfill of Mizunami Underground Research Laboratory
Keywords:Backfilling of the Mizunami Underground Research Laboratory, stress changes in bedrock, pore pressure changes
In order to observe the stress changes associated with the pore pressure changes during and after MIU backfill. Tono Research Institute of Earthquake Science extended the power supply and signal cables of STG500 and STG200N borehole observation site to the ground, and the observation system was prepared from November to December 2019.
At the end of May 2020, it is expected that the gallery of MIU at a depth of 500m will be backfilled. In the presentation, we will introduce the observation record and analysis results of water pressure and stress records of STG500N during backfilling.