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    Z Z Z U Z: Example: Dia. 72mm X 144mm Length Sample (Volume 586.29 CM

    Uploaded by

    Dr Wong Kim Yuen
    The document discusses the calculation of effective vertical stress in soils. It states that effective vertical stress (σ'v) is equal to total vertical stress (σv) minus the pore water pressure (u). Total vertical stress is equal to the saturated unit weight (γsat) multiplied by the depth (z). In situations where the water level is unknown, pore water pressure is often ignored and total vertical stress is used. An example calculation is provided to demonstrate determining the saturated unit weight from bulk density measurements, and then calculating the total vertical stress at a given depth.

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    Z Z Z U Z: Example: Dia. 72mm X 144mm Length Sample (Volume 586.29 CM

    Uploaded by

    Dr Wong Kim Yuen
    19 views1 page
    The document discusses the calculation of effective vertical stress in soils. It states that effective vertical stress (σ'v) is equal to total vertical stress (σv) minus the pore water pressure (u). Total vertical stress is equal to the saturated unit weight (γsat) multiplied by the depth (z). In situations where the water level is unknown, pore water pressure is often ignored and total vertical stress is used. An example calculation is provided to demonstrate determining the saturated unit weight from bulk density measurements, and then calculating the total vertical stress at a given depth.

    Original Description:

    Total vertical stress calculation

    Original Title

    Total Vertical Stress

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    The document discusses the calculation of effective vertical stress in soils. It states that effective vertical stress (σ'v) is equal to total vertical stress (σv) minus the pore water pressure (u). Total vertical stress is equal to the saturated unit weight (γsat) multiplied by the depth (z). In situations where the water level is unknown, pore water pressure is often ignored and total vertical stress is used. An example calculation is provided to demonstrate determining the saturated unit weight from bulk density measurements, and then calculating the total vertical stress at a given depth.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    19 views1 page

    Z Z Z U Z: Example: Dia. 72mm X 144mm Length Sample (Volume 586.29 CM

    Uploaded by

    Dr Wong Kim Yuen
    The document discusses the calculation of effective vertical stress in soils. It states that effective vertical stress (σ'v) is equal to total vertical stress (σv) minus the pore water pressure (u). Total vertical stress is equal to the saturated unit weight (γsat) multiplied by the depth (z). In situations where the water level is unknown, pore water pressure is often ignored and total vertical stress is used. An example calculation is provided to demonstrate determining the saturated unit weight from bulk density measurements, and then calculating the total vertical stress at a given depth.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    of 1

    Effective vertical stress due to self weight of soil

    Is given by:

    v = v u where, v = sat x z
    = (sat - w) x z u = w x z
    = x z sat = saturated unit weight
    w = water unit weight, 9.81 kN/m3
    z = depth
    = buoyant unit weight of the soil

    In the absence of data on water level or reliable water table, the in-situ pore water
    pressure, u is often not taken into consideration.

    Therefore, total vertical stress, v = sat x z

    Example: Dia. 72mm x 144mm length sample ( volume = 586.29 cm3 )


    at depth 6.0 metres, with a wet weight of 1170 gms

    Bulk density, = Mass = 1170 g = 1.996 Mg/m3 (1.996 g/cc)


    Volume 586.29 cc
    3
    Unit weight of soil in kN/m can be obtained from densities in Mg/m3 as
    sat = g 2
    ( g = acceleration due to gravity = 9.81m/sec )
    = 1.996 x 9.81
    = 19.58 kN/m3

    Total vertical stress, v = 19.58kN/m x 6.0m = 117 kN/m


    3 2

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