1. 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

2. INTRODUCTION MONITORING SYSTEM INSTALLATION MONITORING RESUTLS FUTURE SCOPES

3. INTRODUCTION

4. August 2011 October 2012 Fudo Sawa, Takase River,Nagano Prefecture, Japan Loss of Storage capacity and subsequent effect: Specific Sedimentation Rate of Reservoir at Takase Dam :5,020m 3 /km 2 /year Fudosawa contributed 35,000m 3 /km 2 /year of sedimentation Predict the phenomena and propose effective countermeasures and simulate a model to against slope failure.

5. Wetting Front Slip Surface Unsaturated Zone Saturated Zone Ground Water Table

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

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

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

9. GRAIN SIZE DISTRIBUTION Granular Soil with D 50 =4.5mm Grain Size (mm) Percent Finer by Weight (%)

10. 1 34 5 6 7 8 2 1 2 4 5 6 7 8 Fudo Sawa Takase Dam Observation Point 3 By Google

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

12. October 27, 2012 Comparison

13. MONITORING SYSTEM INSTALLATION AND MEASUREMENT

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

15. AB MONITORING SYSTEM LAYOUT

16. Monitoring System Installation Process 1 23 456 Drilling Borehole Borehole Depth Measurement Placement of Pore Water Pressure Gauge Rain Gauge Installation Thermometer Installation Data Logger Setup Camera Setup MONITORING SYSTEM COMPONETS 7

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

18. MONITORING RESULTS

19. RECORD OF TEMPERATURE

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

21. Typhoon Jelawat PORE WATER PRESSURE IN THE SLOPE AND TEMPERATURE AT GOURND SURFACE

22. INTERACTION BETWEEN PORE WATER PRESSURE IN THE SLOPE AND INTENSITY OF RAINFALL Typhoon Jelawat Typhoon Onyok NoTyphoonRainfall(mm/day) FudosawaOmachi 1Onyok(9/30/2011)53(9/30)8(9/30) 2Jelawart(9/30/2012)72(9/30)44.5(9/30) Heavy Rain Warning

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

24. 台風 17 号 ジェラワット Rock Flood Soil Washed out

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

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