appearance and properties resulting from weathering of a parent earth - - PowerPoint PPT Presentation

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appearance and properties resulting from weathering of a parent earth - - PowerPoint PPT Presentation

Mar 03, 2024 25 likes •107 views

IIT Bombay Slide 3 a natural body, separated into horizons of different appearance and properties resulting from weathering of a parent earth material A Organic and leached (very Active/Instable phase) B Accumulation of fines (Active

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SLIDE 1

“a natural body, separated into horizons of different appearance and properties resulting from weathering of a parent earth material”

A Organic and leached (very Active/Instable phase) B Accumulation of fines (Active phase) “topsoil” C “subsoil” or original parent material (geological) soil (Dormant phase)

Slide 3 IIT Bombay Environmental Geomechanics Lecture No. 3-4-5-6 D N Singh

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SLIDE 2

“any uncemented or weakly cemented accumulation

  • f mineral particles formed by the weathering of

rocks, the void spaces between the particles containing water and/or air” (Minerals, Air, water---------A live material)

A PARTICULATE MATERIAL, REGARDLESS OF MINERAL OR ORGANIC COMPOSITION, THAT REACTS TO EXTERNAL FORCES BY THE INTERACTION BETWEEN

INDIVIDUAL PARTICLES/GRAINS

Slide 4 IIT Bombay Environmental Geomechanics Lecture No. 3-4-5-6 D N Singh

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SLIDE 3

SOIL: A LIVING ENTITY

Hence quite susceptible & Sensitive to the Environment in which it stays

Heritage Parentage Linkage Genetics Memory Emotions Response to external stimulus

just like Human (living) beings

Slide 5 IIT Bombay Environmental Geomechanics Lecture No. 3-4-5-6 D N Singh

…….. Rock cycle

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SLIDE 4

Panc anch h Tatva tvas (E s (Element lements) s)

  • f
  • f J

Jee eevan ( van (Lif Life) e) Kshitij Kshitij (Horiz (Horizon)

  • n)

Ga Gagan (Sk gan (Sky) y) Pavak (Fir vak (Fire) e) Jal (W al (Water) ter) Sameer (Air) Sameer (Air)

Infinity Formation of soil Deposition & Transportation

  • f soil

Slide 6 IIT Bombay Environmental Geomechanics Lecture No. 3-4-5-6 D N Singh

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SLIDE 5

A C T I V I T Y

Sand >0.075mm Boulder >12” Cobble >6” Gravel >4.75mm Silt >0.075mm Clay >0.002mm Organic matter

S O I L

Experience

Slide 7 IIT Bombay Environmental Geomechanics Lecture No. 3-4-5-6 D N Singh

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SLIDE 6

Soil: particulate, much more complex than steel & its Behavior is influenced by:

  • Soil type (grain size, shape, minerals etc.)
  • Water, Air, content
  • Electro-chemical effects
  • Climate (humidity, temperature, pressure, permafrost)
  • Stress history (of loading and unloading, N.C., O.C. behavior)
  • Still much more (& better) predictable & workable than

the living beings (who originate from it)

Slide 8 IIT Bombay Environmental Geomechanics Lecture No. 3-4-5-6 D N Singh

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SLIDE 7

SYMPTOMS COMMON TO HUMANS & SOILS

Obesity Aneroxia High B.P. Giddiness Epilepsy Fractures Fatigue Urinary problems Expansive soil Shrinkage Excess pore water pressure Instability Liquefaction Failures/collapse of foundations retaining walls, piles etc. Cyclic loading Drainage

Slide 9 IIT Bombay Environmental Geomechanics Lecture No. 3-4-5-6 D N Singh

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SLIDE 8

Challenges and Concerns??

Geotechnical Engineering Professionals are involved with:

Diagnostics [of Symptoms & Abnormalities] + Prescription [adequate corrections] + Prolonged Monitoring (Effectiveness of Prescription)

Slide 10 IIT Bombay Environmental Geomechanics Lecture No. 3-4-5-6 D N Singh