Geotechnical engineering is the branch of civil engineering concerned with the engineering behavior of earth materials. Geotechnical engineering is important in civil engineering concerned with construction on or in the ground. Geotechnical engineering uses principles of soil mechanics and rock mechanics to investigate subsurface conditions and materials; determine the relevant physical/mechanical and chemical properties of these materials; evaluate; assess risks posed by site conditions; design earthworks and structure foundations; and monitor site conditions, earthwork and foundation construction.
Soil, one of the major part of is the loose surface material consisting of inorganic particles and organic matter that covers most of the land surface. Soil provides the structural support and the source of water and nutrients for plants used in agriculture. Soil makes up the outermost layer of our planet. Topsoil is the most productive soil layer.
Mainly 5 size fractions are used to describe the inorganic part of the soil i.e. Gravel, Coarse Sand , Fine Sand, Silt & Clay . The proportion of these components determines if a soil is a sand, loam or clay or any combination of these .Based upon this Texture of soil, it can be of several types :
Sand – A sand has a loose gritty feel and does not stick together. Individual sand grains can be seen or felt.
Loamy Sand – In a loamy sand particles barely stick together and a moulded piece of soil just holds its shape.
Sandy Loam – A sandy loam sticks together more than a loamy sand but can be easily broken. Individual sand grains can be felt and heard if a wet sample is rubbed between the index finger and thumb and held close to the ear.
Silty Loam – A silty loam is like a loam but has a smooth silky feel when a moist sample is pushed between the index finger and thumb. On drying a sample can form a hard lump but this may be broken by hand.
Loam – A loam breaks into crumbs but will tend to stick together. Sand grains cannot be felt in a moist sample which when squeezed will retain its shape when handled freely. Loams are usually soft to the feel.
Sandy Clay Loam – A sandy clay loam is like a clay loam but sand grains can be felt (and heard – see Sandy Loam)
Silty Clay Loam – A silty clay loam is like a clay loam but silty as well and smooth to the touch.
Clay Loam – More easily moulded into a shape than a loam, a clay loam rolls out to a thin ribbon between the palms while a loam will break-up. When dry a clay loam will form a lump but is not as tough to break as a clay.
Sandy Clay – A sandy clay is like a clay but sand grains can be felt (and heard – see Sandy Loam).
Silty Clay – A silty clay is like a clay but smoother.
Clay – Clays are tough and can be moulded into shapes when moist. Clays form a long flexible ribbon when rubbed between the palms and the ribbon can often be bent into a “U” shape without breaking. Clays dry into very hard clods.
The organic matter of soil usually makes up less than 10% by weight of soil. Plants living in soil continually add organic matter in the form of roots and debris. Decomposition of this organic matter by microbial activity releases nutrients for the growth of other plants. The organic matter content of a soil depends on the rates of organic matter addition and decomposition
We provide the following soil analysis & and services:
Strength & Stability studies
Geo Technical Survey
Direct Shear Test
Soil Bearing Capacity
Plate load test
(Load bearing Capacity)
Standard Penetration test
Cation Exchange Capacity
Proctor Test (OMC & MDD)
Linear & Volumetric Shrinkage
California Bearing Ratio (lab & Field)
Dyanamic Cone Penetration Test (DCPT)
Water Holding Capacity
Carbon to Nitrogen Ratio
Unconfined Compressive Strength
Dry Bulk Density
Particle size distribution
Sand Equivalent Value
Free Swell Index
Sodium Absorption Ratio (SAR)
Grain Size Analysis
MAJOR INSTRUMENTATION AVAILABLE AT SRI FOR SOIL INVESTIGATIONS
Triaxial shear Strength unit
Automatic Direct Shear Unit
Soil Permeability unit
Earth Resistivity Meter
Core Cutters for Soil compaction
Plate load unit
Safe bearing capacity unit with load truss
Standard Penetration Test unit
Grain size analyzer
Shrinkage Limit unit
Swell test unit
Sand Equivalent Value unit
Compressive Strength Machines
Atomic Absorption spectrophotometers
Inductively Coupled Plasma
UV – Visible spectrophotometer
GC & GC – MS
Specific Gravity units
MAJOR PROJETS UNDERTAKEN
Soil investigations at NOIDA UP, Nuh Haryana, IMT Manesar, Sohna Haryana, Gjraula UP , Colleges of University of Delhi
Geotechnical Investigations including Plate Load test , Safe Bearing Capacity , Load bearing Capacity in Delhi, NCR and neighboring states
Soil Investigations & Load Bearing Capacity For Uttrakhand Municipal Corporation
Investigations of Soil Quality & groundwater at Pant Nagar, Uttrakhand, Power House, Rampur, UP
Soil investigations at different sites at Nagar Panchyat , Didihat ,Uttrakhand
Field test for determination of modulus of sub-grade reaction (K-value) and CBR For Airport Authority of India
Geo-Technical Investigation to evaluate bearing capacity of soil at Proposed Site to Construct Auditorium and Academic Blocks
Quality evaluation of soil used for construction of road in resettlement colonies in Delhi
Quality evaluation of soil used for construction of high-rise buildings in NCR region.
In –situ Sub-soil penetration resistance characteristics studies.