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Recent Development of PS Logging in Japan

台湾・美國・日本 /Taiwan ・ US ・ Japan Workshop on Liquefaction November 3-4, 2003, Hsinchu, Taiwan. Recent Development of PS Logging in Japan. Yoshi Iwasaki Geo-Research Inst., Osaka. Poisson's Ratio. Poisson's Ratio. Poisson's Ratio. Vs, Vp(km/sec). Vs, Vp(km/sec). Vs, Vp(km/sec).

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Recent Development of PS Logging in Japan

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  1. 台湾・美國・日本/Taiwan・US・Japan Workshop on Liquefaction November 3-4, 2003, Hsinchu, Taiwan Recent Development of PS Logging in Japan YoshiIwasaki Geo-Research Inst., Osaka Taiwan/US/Japan　WS

  2. Poisson's Ratio Poisson's Ratio Poisson's Ratio Vs, Vp(km/sec) Vs, Vp(km/sec) Vs, Vp(km/sec) Kitsunezaki invented suspension PS-logging system In loose and soft ground, it is difficult to perform logging by borehole pick. Borehole pick

  3. 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.

  4. Shear Wave Source Electromagnetic hammer Pressure increase S-wave decrease

  5. Tube waves Source does not always work as designed. Hammer action may induce some volume change. Compression/Expansion in all direction induces tube waves. Sensor Balloon filter Source To cut tube wave, balloon was inserted between source and sensor.

  6. 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.

  7. Under sea logging for Kansai airport Experimental Study by Port and Harbor Research Institute Diver was sent down to the bottom of the sea to strike wooden plate by sledge hammer.

  8. Kansai Air port

  9. Cross Correlation CrossCorrelation between 6m(N) and 7m(N)

  10. Schlumberger

  11. Automatic Velocity Determination

  12. Waves fromMonopole source Shear wave velocity is smaller than Fluid wave

  13. Waves from monopole source Shear wave velocity is larger than fluid wave.

  14. Waves from dipole source

  15. PS-logging at Kobe 1700m in depth Holocene Pleistocene (Quaternary) Granite

  16. PS-loggingat Kobe

  17. 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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