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CHIEN-WEN HUANG DOCTORAL STUDENT TOKYO METROPOLITAN UNIVERSITY

MESUREMENT OF PORE WATER PRESSURE IN A GROUND, TEMPERATURE AND RAINFALL AT SLOPE FAILURE IN MOUNTAINOUS AREA . CHIEN-WEN HUANG DOCTORAL STUDENT TOKYO METROPOLITAN UNIVERSITY. INTRODUCTION. MONITORING SYSTEM INSTALLATION . MONITORING RESUTLS. FUTURE SCOPES. INTRODUCTION. INTRODUCTION.

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CHIEN-WEN HUANG DOCTORAL STUDENT TOKYO METROPOLITAN UNIVERSITY

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  1. MESUREMENT OF PORE WATER PRESSURE IN A GROUND, TEMPERATURE AND RAINFALL AT SLOPE FAILUREIN MOUNTAINOUS AREA CHIEN-WEN HUANG DOCTORAL STUDENT TOKYO METROPOLITAN UNIVERSITY

  2. INTRODUCTION MONITORING SYSTEM INSTALLATION MONITORING RESUTLS FUTURE SCOPES

  3. INTRODUCTION

  4. INTRODUCTION • Fudo Sawa, Takase River ,Nagano Prefecture, Japan • Loss of Storage capacity and subsequent effect: • Specific Sedimentation Rate of Reservoir at TakaseDam :5,020m3/km2/year • Fudosawa contributed 35,000m3/km2/year of sedimentation • Predict the phenomena and propose effective countermeasures and simulate a model to against slope failure. August 2011 October 2012

  5. Unsaturated Zone Saturated Zone Daily Monitoring Ground Water Table Measurement Results Hazard Prediction RESEARCH PURPOSE Wetting Front Slip Surface

  6. GEOLOGICAL CONDITION • Altitude:1,550m~1,600m • Ave. Temperature:-16ºC~30ºC • Ave. Precipitation:2,100mm/year • Late Cretaceous – Paleogene Granite Rocks Talus Cone Deposit Nagano City Talus Cone Deposit Nagano Prefecture Omachi Fudo Sawa Lake Suwa

  7. LOCATION OVERVIEW A Pore power pressure Gauges Rain Gauge ~65m ~ 99m C ~33m B

  8. GRAIN SIZE DISTRIBUTION Percent Finer by Weight (%) Grain Size (mm) • Granular Soil with D50=4.5mm

  9. 1 4 3 2 Observation Point 8 7 6 Fudo Sawa 5 Takase Dam 4 2 1 3 By Google 5 6 7 8

  10. Comparison November 11, 2010 July 31, 2012 October 27, 2012

  11. Comparison July 31, 2012 October 27, 2012

  12. MONITORING SYSTEM INSTALLATION AND MEASUREMENT

  13. MONITORING SYSTEM COMPONETS Data Logger Rain Gauge Camera Thermometer Pore Water Pressure Gauges

  14. MONITORING SYSTEM LAYOUT A B

  15. MONITORING SYSTEM COMPONETS Monitoring System Installation Process • Drilling Borehole • Borehole Depth Measurement • Placement of Pore Water Pressure Gauge • Rain Gauge Installation • Thermometer Installation • Data Logger Setup • Camera Setup 1 2 3 4 5 6 7

  16. WHO DOES THE BEST JOBS FOR THE FIELD TRIP IN THE WORLD

  17. MONITORING RESULTS

  18. PORE WATER PRESSURE IN THE SLOPE AND TEMPERATURE AT GOURND SURFACE Typhoon Jelawat Pore water pressure decreased

  19. INTERACTION BETWEEN PORE WATER PRESSURE IN THE SLOPE AND INTENSITY OF RAINFALL Heavy Rain Warning Typhoon Onyok Typhoon Jelawat

  20. INTERACTION BETWEEN PORE WATER PRESSURE IN THE SLOPE AND INTENSITY OF RAINFALL Typhoon Jelawat

  21. Typhoon Jelawat 台風17号　ジェラワット Flood Soil Washed out Rock

  22. SLOPE MONITORING MODEL SIMULATION The fist step of the slope monitoring for modeling of changes in pore water pressure response in ground due to rain fall. Simulating the real time pore water pressure and rainfall distribution in time history after rainfall events based on the data collected through monitoring system. 1 FUTURE SCOPES 1 2

  23. THANK YOU! For more information, please log on to our website http://geot.civil.ues.tmu.ac.jp/

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