Yoshi Iwasaki

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Information about Yoshi Iwasaki

Published on October 9, 2007

Author: Abigail

Source: authorstream.com

Recent Development of PS Logging in Japan:  Recent Development of PS Logging in Japan Yoshi  Iwasaki Geo-Research Inst., Osaka 台湾・美國・日本/Taiwan・US・Japan Workshop on Liquefaction November 3-4, 2003, Hsinchu, Taiwan Kitsunezaki invented suspension PS-logging system:  Kitsunezaki invented suspension PS-logging system Vs, Vp(km/sec) Poisson's Ratio Vs, Vp(km/sec) Poisson's Ratio Vs, Vp(km/sec) Poisson's Ratio Borehole pick In loose and soft ground, it is difficult to perform logging by borehole pick. Development of Suspension System:  Development of Suspension System Liquid moves with surrounding ground. If the pick up is the same density as the liquid Suspension sensor detects shear wave in liquid. Shear Wave Source:  Shear Wave Source S-wave Pressure increase decrease Electromagnetic hammer Tube waves:  Tube waves Source does not always work as designed. Hammer action may induce some volume change. Compression/Expansion in all direction induces tube waves. To cut tube wave, balloon was inserted between source and sensor. Sensor Balloon filter Source Patent :  Patent  Kitsunezaki obtained Japanese Patent on Suspension PS-logging. He does not ask to pay royalty but to open the PS-velocity data to be disclosed insisting the geological data should be open to everybody. OYO insisted the patent is invalid. Under sea logging for Kansai airport:  Under sea logging for Kansai airport Diver was sent down to the bottom of the sea to strike wooden plate by sledge hammer. Experimental Study by Port and Harbor Research Institute Kansai Air port:  Kansai Air port Cross Correlation:  Cross Correlation Cross Correlation between 6m(N) and 7m(N) Schlumberger:  Schlumberger Automatic Velocity Determination:  Automatic Velocity Determination Waves from Monopole source:  Waves from Monopole source Shear wave velocity is smaller than Fluid wave Waves from monopole source:  Waves from monopole source Shear wave velocity is larger than fluid wave. Waves from dipole source:  Waves from dipole source PS-logging at Kobe 1700m in depth:  PS-logging at Kobe 1700m in depth Granite Pleistocene Holocene (Quaternary) PS-logging at Kobe :  PS-logging at Kobe Conclusion:  Conclusion Suspension type PS-logging tool has been invented and used widely to measure PS-velocity in geotechnical engineering for shallow depth. Schlumberger has further developed the system to process automatic velocity determination and for deeper application. The same system as Schlumberger may be developed for shallow and smaller diameter in near future.

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