HEAT MIGRATION THROUGH SOIL MASS AT VARIED TEMPERATURES KARTIK - - PowerPoint PPT Presentation

KARTIK KHANNA (174046011) Under the supervision of

• Prof. D.N. Singh

Department of Civil Engineering Indian Institute of Technology, Bombay Powai, Mumbai - 400076

26-03-2018

HEAT MIGRATION THROUGH SOIL MASS AT VARIED TEMPERATURES

ISSUES FOR SUSTENANCE

• 1. Underground high voltage power cables
• 2. Underground Buried Pipelines
• 3. Rocket Launching Pads
• 4. Municipal solid Waste
• 5. High Level Nuclear waste
• 6. Geothermal piles
• 7. Infrastructure at Sub zero temperatures

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26-03-2018 SAND SILTY CLAY MARINE CLAY PEAT

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VEGETATION HARD STRATUM/ ROCK

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4 6 1 2 7

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Bowl Oven Dried Soil Mass Bowl

FREEZER θ = -10 ̊C

What will happen to the soil mass? Unsaturated soil Mass, S= 0.5

• 1. Condensation of Vapours
• 2. Supercooling of moisture
• 3. Nucleation of Ice
• Pore Ice
• Ice lenses

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Heat migration in soil mass at varied temperatures

Ta<Ts Ice Lenses Frozen Soil Mass Freezing Front/Fringe Heat Flux Ice Lenses

(a) (b) (c)

Moisture migration Ta=Ts Cryosuction

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10.02 0.24

Contact?? TR-1 SENSOR NEEDLE

All Dimensions in cm

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THERMO-HYDRO-MECHANICAL BEHAVIOUR OF SOILS

PUNEET RATHI (163040014) Department of Civil Engineering Indian Institute of Technology Bombay 16 February 2018

INTRODUCTION

Nuclear waste Energy piles Oil recovery from deep depth Oil reservoir Blast CO2 sequestration High power cables

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Soil – atmosphere interaction

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Way forw rward: where research is heading to?

Effect of temperature (in general, thermal energy) on geotechnical properties of soil in its saturated and unsaturated state.

• Ground water table
• Permeability
• Compressibility (or volume change)
• Shear strength

12 26-03-2018 13:46 CE 488 Environmental Geotechnics | Puneet Rathi | 163040014