TI - 1 - Daya Dukung Tanah
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Transcript of TI - 1 - Daya Dukung Tanah
Daya dukung tanah (bearing capacity)
Kuliah-1 (CES 31017)T.Ilyas
Bahan referensiBraja M Das, Principal of Geotechnical Engineering, fourth edition, PWS Publishing Company, 1998, BostonMuni Budu, Soil Mechanics and Foundations, 2nd
edition, John Wiley & Sons, 2007, USABouwles, Foundation Analysis and design, 5th edition, Mc Graw-Hill, 1997 R.F. Craig, Soil Mechanics, (English & terjemahanProf.Dr.Ir Budi S Supandji)Cernica, J.N., Soil Mechanics, John Wiley & Sons,1995Holtz, R.D., Kovacs, W.D., An introduction to Geotechnical Engineering, Prentice Hall, N.J., 1981
Penilaian (grader)
UTS 30%UAS 30%Tugas/responsi 10%Praktikum 30%
Tugas diberikan melalui SCeLE (Student Center e-Learning Environment) ditambah tugas responsi.
Bearing capacity
The lower part of a structure is generally referred to foundation.Its function is to transfer the load throught out the soil without overstressing the soil
Allowable bearing capacity (qa )
Defined as the maximum pressure that may be applied to the soil that 2 fundamental requirement are satisfied
1. the factor of safety with respect to shear failure of the supporting soil must be adequate2. the settlement of the foundation should be tolerable
Ultimate bearing capacity (qu )
Defined as the least pressure that will cause complete shear value of the soil in the vicinity of the foundation
Failure mechanism
General shear
Local shear
Punching shear
General and local shear failure
Terzhagi’s (1943) bearing capacity (general shear)
Terzaghi’s bearing capacity capacity factors (general shear)
Effect of ground water table
q = γ
Df
Factor of safety (Fs
)
Definition of allowable bearing capacity:Gross allowable bearing capacity
Net allowable bearing capacity
whrere q= γ
Df
hence
Gross allowable bearing capacity with factor of safety respect to shear value
Good practice used
Bearing Capacity examplesA continous footing is shown below. Using Terzaghi’s bearing capacity factors, determine qall per unit area that footing can support. Take safety factor of 3.
q = γ
D
Bearing cap factorNc , Nq , N γ
from Terzagi’s
table