CALCULATION OF ALLOWABLE S B C OF C-Ø SOIL  

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

 PROGRAM INFO / LIMITATIONS.

This program calculates allowable safe bearing capacity of C-Ø soil.
The program is not suitable for only cohesive soil (Ø = 0) .
 Gross safe bearing capacity = Net safe bearing capacity + Over burden (density x     soil depth).
 In case the S P T ( N' ) value is not given the program calculates the same from     available Ø  value. When the S P T ( N ' ) value is given, program applies      correction factors to it & arrives at  corrected N value.
 Some salient features of CODE are as under. 


MAXIMUM TOTAL PERMISSIBLE SETTLEMENT

ISOLATED FOUNDATION ON CLAY 65 MM 
ISOLATED FOUNDATION ON SAND 40 MM
RAFT FOUNDATION ON CLAY  65 MM TO 100 MM
RAFT FOUNDATION ON SAND 40 MM TO 65 MM 
NOTE: IN ORDER TO KEEP THE DIFFERENTIAL SETTLEMENT TO A BARE MINIMUM, IT IS PRUDENT TO RESTRICT THE TOTAL SETTLEMENT IN BUILDINGS TO 25 MM.

SAFE BEARING CAPACITY  IN T / M2
SR NO. TYPE OF SOIL / ROCK SAFE BEARING CAPACITY
1 HARD ROCK WITHOUT LAMINATION AND  DEFECTS.

330

2 LAMINATED ROCK 165
3 SHATTERED & BROKEN ROCK 90
4 SOFT ROCK 45
5 COMPACT GRAVEL , SAND + GRAVEL 45
6 COMPACT & DRY COARSE SAND 45
7 MEDIUM SAND COMPACT & DRY 25
8 FINE  SAND & SILT 15
9 LOOSE GRAVEL, SAND + GRAVEL, DRY MEDIUM SAND  25
10 FINE SAND LOOSE & DRY 10
11 SOFT SHALE, HARD/STIFF CLAY 45
12 MEDIUM CLAY 25
13 MOIST CLAY & SAND + CLAY  15
14 SOFT CLAY 10
15 VERY SOFT CLAY 5