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
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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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