ABSTRACT
The Yanbaru Pumped Storage Power Station is the unique hydro-electric power station utilizing seawater, located in Okinawa Island, Japan. The construction of underground house was completed in 1999 and it is located at a depth of about 132 m below the ground surface. This underground powerhouse provides a unique chance to monitor its dynamic and multi-parameter responses during earthquakes and long-term period. The authors installed three accelerometers in the underground powerhouse and one accelerometer at the ground surface to observe its acceleration response during earthquakes. In addition, some displacement gap sensors, AE sensors at the adjacent connection tunnel, rock temperature and environmental parameters such as temperature, humidity and CO2 sensors in the powerhouse and ground surface were installed to monitor its multi-parameter responses. In this study, the authors describe this instrumentation, some numerical analyses and the results obtained so far.
