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INTRODUCTION TO GEOTECHNIC (:check:DISINTEGRATION OF ROCK (:pencil2…
INTRODUCTION TO GEOTECHNIC
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ROCK CYCLE
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SOIL MECHANIC
is a branch of engineering mechanics that describes the behaviour of soils.
IGNEOUS ROCK
:pencil2:characteristics of igneous rock
classified by texture and composition
normally contains no fossils
rarely reacts with acid
:pencil2:types of igneous rock
granite
basalt
gabbro
SEDIMENTARY ROCK
:pencil2:characteristics of sedimentary rock
often contains fossils
may react with acid
classified by texture and composition
:pencil2:types of sedimentary rock
sandstone
limestone
shale
METAMORPHIC ROCK
:pencil2:characteristics of transported rock
classified by texture and composition
rarely has fossils
may react with acid
:pencil2:types of metamorphic rock
marble
quartzite
gneiss
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DISINTEGRATION OF ROCK
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MECHANICAL WEATHERING
frost
thermal
plant roots
expansion
abrasion
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CHEMICAL DECOMPOSITION
hydration
carbonation
hydrolysis
oxidation
:pencil2:BIOLOGOCAL DECOMPOSITION
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bacterials
microorganisms
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SOILS
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ORGANIC SOILS
contains vegetation rubbish 7 rotten materials
not suitable in supporting foundation/surface
150-300mm from soil surface
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RESIDUAL SOILS
divided into 3 zones
upper zone
intermediate zone
partially weathered zone
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TRANSPORTED SOILS
water
wind
gravity
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SAMPLING
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disturbed soil samples
do not retain the in-situ properties of the soil during the collection process.
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undisturbed soil samples
retain the structural integrity of the in-situ soil and have a high recovery rate within the sampler.
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TYPES OF ROCK
factor/agents
