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

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Presentation transcript:

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

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.

Wetting Front Slip Surface Unsaturated Zone Saturated Zone Ground Water Table

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

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

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

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

Fudo Sawa Takase Dam Observation Point 3 By Google

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

October 27, 2012 Comparison

MONITORING SYSTEM INSTALLATION AND MEASUREMENT

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

AB MONITORING SYSTEM LAYOUT

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 MONITORING SYSTEM COMPONETS 7

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

MONITORING RESULTS

RECORD OF TEMPERATURE

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

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

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

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

台風 17 号ジェラワット Rock Flood Soil Washed out

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

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