SOIL–
Safe
Bearing Capacity of Soil
a)
Plate Load Test (PLT) – IS 1888 – 1982 – The Modulus of
subgrade reaction ( K) 12kg/cm = Mean Bearing Pressure (P) 1.5kg/cm2 / Mean
Settlement (0.125cm) not less than 0.025
b)
Standard Penetration
Test (SPT) - IS 2131 – 1981 - BS EN ISO 22476-3, ASTM D1586 and Australian
Standards AS 1289.6.3.1. The
number of blows required for 150mm - 450
mm penetration into the ground is the standard
penetration number N
c)
Cone Penetration Test
(CPT)
- IS 4968 (P3) – 1987 – N = 10 qc kpa (qc – resistance)
d)
NBC – 1983 – SBC – Rock – 440-3240 kpa, Gravel, Soft Shale,
Course Sand & Stiff Clay – 440 kpa,
Loose gravel, Medium sand & Clay–
245 kpa, Black cotton soil – 130-160
kpa, Fine sand, silt, Moist clay – 100-150
kpa, Very soft clay – 50 kpa
e)
IS: 1498 – 1970 – Classification and
identification of soil - Coarse-grained
soil ( Gravel & Sand) – larger than
75 micron and smaller than 4.75mm IS sieve size, Fine-grained soil – Silts & Clays ( low compressibility – liquid
limit (L) is less than 35, Medium
compressibility – Liquid limit ( I )
is greater than 35 & less than 50 & High compressibility – liquid limit (H) –more than 50) smaller than 75 micron IS sieve size.
f)
IS: 1893 - 2002 - Criteria for earthquake resistant design of structures
g)
IS: 4326 – 1993 – Earthquake Resistant Design
and Construction of Buildings
h)
IS: 13920 –
1993 – Ductile
Detailing of RC Structures subjected to Seismic Forces
Regards,
J.Jaya Ruban,
Land Valuer in Tamilnadu,
Chennai.