CALCULATION OF ALLOWABLE S B C OF COHESIVE SOIL

  AS PER IS : 1904 / 6403.
( Actual Program is available in Super Civil CD. )

 PROGRAM INFO / LIMITATIONS.

This program calculates allowable SBC of Cohesive soil only. ( = 0 )
Some useful information about  soil properties are as follows. 


VALUES OF COMPRESSION INDEX

PEAT 1.0 TO 4.5
CLAY PLASTIC 0.15 TO 1.0
STIFF CLAY 0.06 TO 0.15
MEDIUM HARD CLAY 0.03 TO 0.06
LOOSE SAND 0.025 TO 0.05
DENSE SAND 0.0005 TO 0.01
NOTE: IN CASE THE SETTLEMENT IS TOO HIGH, PRE LOAD THE CLAY STRATA, OR USE SAND / STONE PILES TO IMPROVE THE BEARING CAPACITY & MINIMIZE THE SETTLEMENT. WHEN LOADS EXPECTED ARE HIGH, PILLING CAN BE A BETTER ALTERNATIVE. UNDER REAMED PILES COULD BE USED FOR LOADS OF SMALLER MAGNITUDE.

SHEAR STRENGTH OF COHESIVE SOIL IN T / M2
SR NO. TYPE OF SOIL  CU
1 VERY SOFT CLAY .

0  TO  2.5

2 SOFT CLAY  2.5 TO 5.0
3 MEDIUM CLAY 5.0 TO 10.0
4 STIFF CLAY 10 TO 20
5 VERY STIFF/HARD CLAY 20 TO 40
CU IS UN CONFINED COMPRESSIVE STRESS.
SHEAR STRENGTH OF SOIL C  = CU / 2
MODULUS OF ELASTICITY OF SOIL = 500 TO 1000 CU

 POISSON RATIO

CLAY SATURATED 0.50
CLAY WITH SAND + SILT 0.3 TO 0.42
UN SATURATED CLAY 0.35 TO 0.40
LOESS 0.44
SILT 0.30 TO 0.35
SANDY SOIL 0.15 TO 0.25
SAND 0.30 TO 0.35
ROCK 0.10 TO 0.40