Nothing Special   »   [go: up one dir, main page]
Scribd Logo
Upload

Welcome to Scribd!

  • 1K views

    Soil C and Phi Values

    Uploaded by

    thamirad
    The document provides various relationships for estimating the angle of internal friction (φ) and cohesion (c) of soils based on standard penetration test (SPT) penetration values and soil type. It presents tables relating SPT N-values to φ for sands, soil consistency to SPT blows and unconfined compressive strength, and typical strength characteristics including c for compacted and saturated soils by Unified Soil Classification System group.

    Copyright:

    © All Rights Reserved
    Download as DOCX, PDF, TXT or read online from Scribd

    Soil C and Phi Values

    Uploaded by

    thamirad
    1K views3 pages
    The document provides various relationships for estimating the angle of internal friction (φ) and cohesion (c) of soils based on standard penetration test (SPT) penetration values and soil type. It presents tables relating SPT N-values to φ for sands, soil consistency to SPT blows and unconfined compressive strength, and typical strength characteristics including c for compacted and saturated soils by Unified Soil Classification System group.

    Original Title

    Soil C and Phi values

    Copyright

    © © All Rights Reserved

    Available Formats

    DOCX, PDF, TXT or read online from Scribd

    Did you find this document useful?

    Is this content inappropriate?

    The document provides various relationships for estimating the angle of internal friction (φ) and cohesion (c) of soils based on standard penetration test (SPT) penetration values and soil type. It presents tables relating SPT N-values to φ for sands, soil consistency to SPT blows and unconfined compressive strength, and typical strength characteristics including c for compacted and saturated soils by Unified Soil Classification System group.

    Copyright:

    © All Rights Reserved
    Download as DOCX, PDF, TXT or read online from Scribd
    Download as docx, pdf, or txt
    1K views3 pages

    Soil C and Phi Values

    Uploaded by

    thamirad
    The document provides various relationships for estimating the angle of internal friction (φ) and cohesion (c) of soils based on standard penetration test (SPT) penetration values and soil type. It presents tables relating SPT N-values to φ for sands, soil consistency to SPT blows and unconfined compressive strength, and typical strength characteristics including c for compacted and saturated soils by Unified Soil Classification System group.

    Copyright:

    © All Rights Reserved
    Download as DOCX, PDF, TXT or read online from Scribd
    Download as docx, pdf, or txt
    You are on page 1of 3

    GEOTECHNICAL INFO .

    COM

    Typical relationships for estimating the angle of internal friction, , are as follows:

    Empirical values for , of granular soils based on the standard penetration number,
    (from Bowels, Foundation Analysis).

    SPT Penetration, N-Value (blows/ foot)  (degrees)


    0 25 - 30
    4 27 - 32
    10 30 - 35
    30 35 - 40
    50 38 - 43

    Relationship between , and standard penetration number for sands, (from Peck
    1974, Foundation Engineering Handbook).

    SPT Penetration, N-
    Value (blows/ foot) Density of Sand  (degrees)
    <4 Very loose <29
    4 - 10 Loose 29 - 30
    10 - 30 Medium 30 - 36
    30 - 50 Dense 36 - 41
    >50 Very dense >41

    Relationship between , and standard penetration number for sands, (from


    Meyerhof 1956, Foundation Engineering Handbook).

    SPT Penetration, N-
    Value (blows/ foot) Density of Sand  (degrees)
    <4 Very loose <30
    4 - 10 Loose 30 - 35
    10 - 30 Medium 35 - 40
    30 - 50 Dense 40 - 45
    >50 Very dense >45
    c = Suc/2
    Where:
    c = cohesion, kN/m2 (lb/ft2), and
    Suc = unconfined compressive strength, kN/m2 (lb/ft2).

    Guide for Consistency of Fine-Grained Soil, NAVFAC 7.02


    SPT
    Penetration (blows/ Estimated
    foot) Consistency Suc (tons/ft2)
    <2 Very Soft <0.25
    2-4 Soft 0.25 - 0.50
    4-8 Medium 0.50 - 1.0
    8 - 15 Stiff 1.0 - 2.0
    15 - 30 Very Stiff 2.0 - 4.0
    >30 Hard >4

    Empirical Values for Consistency of Cohesive Soil, (from Foundation


    Analysis, Bowels)
    Estimated
    SPT Penetration (blows/ foot) Consistency Suc (kips/ft2)
    0-2 Very Soft 0 - 0.5
    2-4 Soft 0.5 - 1.0
    4-8 Medium 1.0 - 2.0
    8 - 16 Stiff 2.0 - 4.0
    16 - 32 Very Stiff 4.0 - 8.0
    >32 Hard >8

    Typical Strength Characteristics (from Lindeburg, Civil Engineering


    Reference Manual for the PE Exam, 8th ed.)

    USCS Soil Group c, as compacted (lb/ft2) (kN/m2) c, saturated (lb/ft2)


    GW 0 0
    GP 0 0
    GM - -
    GC - -
    SW - -
    SP - -
    SM 1050 420
    SM-SC 1050 300
    SC 1550 230
    ML 1400 190
    ML-CL 1350 460
    CL 1800 270
    OL - -
    MH 1500 420
    CH 2150 230

    You might also like