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Chinese Laboratory Soil Test Standard


    l  Laboratory soil test includes the tests for he physical indexes,  mechanical property indexes, and dynamic property of soil, and mineral analysis of clay.

    l  Laboratory rock test includes tests for water-physical property, rock strength and deformation, shearing strength of rock structure surface, shear creep of rock soft layers, point load strength of rock, etc.

    Chapter One Physical property Test of soil

    1. Particle size analysis

    l  For fractions d>0.075mm, sieving method is applied;

    l  For fractions d<0.075mm, hydrometer method and pipette method are applied.

    1)      Sieving method

    Weighed sample is put onto the top sieve which has the biggest screen openings. Each lower sieve in the column has smaller openings than the one above. Do sieving then,The weight of the sample of each sieve is then divided by the total weight to give a percentage retained on each sieve.

    2)      Hydrometer method

    It is applied to determine the content of the soils whose grain size is smaller than a certain diameter value.

                                         

    Here d----sample grain diameter (mm);

         ? --- dynamic viscosity coefficient of water

    GWT-- water proportion at T℃

    PWT-- -density of pure water at 4℃(g/cm3)

     L --- settlement distance of soil grain within a period(cm)

    T--- settlement time (S)

    g--- gravitational acceleration

     

     

    Particle analysis results

     

    Table1-1 Particle analysis result 

    Sample No.

    Fractionmmcontent

    >2

    2-0.5

    0.5-0.25

    0.25-0.075

    0.075-0.005

    <0.005

    1

    28

    10

    15

    20

    10

    17

     

     

    Table1-2 Particle analysis result

    Sample No.

    cumulative content of fraction less than mm

    >2

    <2

    <0.5

    <0.25

    <0.075

    <0.005

    1

    28

    72

    62

    47

    27

    17

     

     

     

    ……

    For more information about soil lab tests, including soil classification, consolidation, triaxial test, shearing test and water content, please contact us via [email protected]

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