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6.16: Nomenclature

  • Page ID
    34787
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    a1,a2

    Weight factors k-value (permeability)

    -

    A

    Surface

    m2

    bpr

    Projected width of the blade perpendicular to the velocity direction

    m

    ci ,c1 ,c2

    Coefficients (non-cavitating cutting process)

    -

    cr

    Coefficient side effects

    -

    cs

    Wear coefficient

    -

    ct

    Coefficient total cutting force (non-cavitating cutting process)

    -

    cts

    Coefficient total cutting force including wear effects

    -

    ctr

    Coefficient total cutting force including side effects

    -

    di ,d1 ,d2

    Coefficients (cavitating cutting process)

    -

    dr

    Coefficient side effects

    -

    ds

    Wear coefficient

    -

    dt

    Coefficient total cutting force (cavitating cutting process)

    -

    dts

    Coefficient total cutting force including wear

    -

    dtr

    Coefficient total cutting force including side effects

    -

    Esp

    Specific cutting energy

    kN/m2

    Egc

    Specific cutting energy (no cavitation)

    kN/m2

    Eca

    Specific cutting energy (full cavitation)

    kN/m2

    Fci

    Cutting force (general)

    kN

    Fcit

    Total cutting force (general)

    kN

    Fh

    Horizontal cutting force (parallel to the cutting speed)

    kN

    Fl

    Cutting force parallel to the edge of the blade

    kN

    Fn

    Normal force

    kN

    Fv

    Vertical cutting force (perpendicular to the cutting velocity)

    kN

    Fw

    Friction force

    kN

    Fx

    Cutting force in x-direction (longitudinal)

    kN

    Fxt

    Total cutting force in x-direction (longitudinal)

    kN

    Fy

    Cutting force in y-direction (transversal)

    kN

    Fyt

    Total cutting force in y-direction (transversal)

    kN

    Fz

    Cutting force in z-direction (vertical)

    kN

    g

    Gravitational acceleration

    m/s2

    hi

    Initial layer thickness

    m

    hb

    Blade height

    m

    k

    Permeability

    m/s

    ki

    Initial permeability

    m/s

    kmax

    Maximum permeability

    m/s

    km

    Effective permeability

    m/s

    K1

    Grain force on the shear zone

    kN

    K2

    Grain force on the blade

    kN

    l

    Length of the shear zone

    m

    n

    Normal on an edge

    m

    n

    Porosity

    -

    ni

    Initial pore percentage

    %

    nmax

    Maximum pore percentage

    %

    N1

    Normal force on the shear zone

    kN

    N2

    Normal force on the blade

    kN

    p

    Number of blades excavating element

    -

    p

    Pressure (water pressure)

    kPa

    patm

    Atmospheric pressure

    kPa

    Pcalc

    Calculated dimensionless pressure (water pore pressure)

    -

    pdamp

    Saturated water pore pressure (12 cm.w.c.)

    kPa

    Preal

    Real pore pressure (water pore pressure)

    kPa

    p1m

    Average pore pressure in the shear zone

    -

    p2m

    Average pore pressure on the blade

    -

    Pc

    Drive power excavating element

    kW

    q, q1 ,q2

    Specific flow

    m/s

    Q

    Flow per unit of blade width

    m2/s

    s

    Length of a stream line

    m

    s

    Measure for the layer thickness

    m

    S1

    Shear force on the shear zone

    kN

    S2

    Shear force on the blade

    kN

    vc

    Cutting velocity perpendicular to the edge of the blade

    m/s

    V

    Volume strain per unit of blade width

    m2

    w

    Width of blade of blade element

    m

    W1

    Pore pressure force on the shear zone

    kN

    W2

    Pore pressure force on the blade

    kN

    x

    Coordinate

    m

    y

    Coordinate

    m

    z

    Coordinate

    m

    z

    Water depth

    m

    α

    Blade angle

    rad

    β

    Shear angle

    rad

    ε

    Volume strain

    -

    φ

    Angle of internal friction

    rad

    δ

    Soil/steel interface friction angle

    rad

    ρg

    Wet density of the sand

    ton/m3

    ρs

    Dry density of the sand

    ton/m3

    ρw

    Density of water

    ton/m3

    θr

    Angular displacement force vector as a result of side effects

    rad

    θs

    Angular displacement force vector as a result of wear

    rad

    θt

    Angle force vector angle in relation to cutting velocity vector

    rad

    θts

    Angle force vector angle in relation to velocity vector including wear

    rad

    θtr

    Angle force vector angle in relation to velocity vector including side effects

    rad

    Θr

    Angular displacement force vector as a result of side effects

    rad

    Θs

    Angular displacement force vector as a result of wear

    rad

    Θt

    Angle force vector angle in relation to cutting velocity vector

    rad

    Θts

    Angle force vector angle in relation to velocity vector including wear

    rad

    Θtr

    Angle force vector angle in relation to velocity vector including side effects

    rad


    6.16: Nomenclature is shared under a not declared license and was authored, remixed, and/or curated by LibreTexts.

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