lecture_5 - Lecture 5 Influence of a Soils Texture, Size,...

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Lecture 5 Influence of a Soil’s Texture, Size, Shape & moisture content on Engineering properties and Soil Classification Homework # 1
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Soil Texture The texture of a soil is its appearance or “feel” and it depends on the relative sizes and shapes of the particles as well as the range or distribution of those sizes. Coarse-grained soils: Gravel Sand Fine-grained soils: Silt Clay 0.075 mm (USCS) Sieve analysis Hydrometer analysis
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Characteristics (Holtz and Kovacs, 1981)
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2 .2 Grain Size Distribution (Cont.) Coarse-grained soils: Gravel Sand Fine-grained soils: Silt Clay 0.075 mm (USCS) Experiment Sieve analysis Hydrometer analysis (Head, 1992)
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Grain Size Distribution (Das, 1998) Sieve size
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2 .2 Grain Size Distribution (Cont.) Log scale (Holtz and Kovacs, 1981) Finer Effective size D 10 : 0.02 mm D 30 : D 60 :
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2 .2 Grain Size Distribution (Cont.) Describe the shape Example: well graded Criteria 2 ) 9 )( 02 . 0 ( ) 6 . 0 ( ) D )( D ( ) D ( C curvature of t Coefficien 450 02 . 0 9 D D C uniformity of t Coefficien 2 60 10 2 30 c 10 60 u = = = = = = mm 9 D mm 6 . 0 D ) size effective ( mm 02 . 0 D 60 30 10 = = = ) sands for ( 6 C and 3 C 1 ) gravels for ( 4 C and 3 C 1 soil graded Well u c u c < < < < -
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Grain Size Distribution (Cont.) Engineering applications - Visualization of soil texture and used for soil classification (next topic). - It can be used to define the grading specification of a drainage filter (clogging). - It can be a criterion for selecting fill materials of embankments and earth dams, road sub-base materials, and concrete aggregates. - It can be used to estimate the results of grouting and chemical injection, and dynamic compaction. - The grain size distribution is more important to coarse-grained soils. -
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lecture_5 - Lecture 5 Influence of a Soils Texture, Size,...

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