Soil mechanics is an important sub-branch of Civil Engineering that deals with properties and behavior of soil. Soil is required in all the major Civil Engineering applications like building, bridges, dams, embankments, retaining walls, and pavement. The behavior and properties of soil vary from place to place and along with the depth also and cannot be ascertained and controlled like that of steel and concrete. Thus, it becomes essential to investigate and study soil properties to bring certainties to these applications. If soil is not able to support these structures, then its properties need to be modified/improved, which comes under the ground improvement processes. Nowadays, another important application of soil mechanics is to remediate and enhance ground properties, which is contaminated by some source of pollution; it is termed as geoenvironmental engineering. The behavior of soil under seismic loading and liquefaction of soil is studied under sub-branch soil dynamics.
There are mainly two groups of soil according to their origin and size-
The properties of soil are divided into two heads: Index properties and Engineering Properties. Index properties are properties that are helpful in the classification and identification of soil for engineering applications. Soil comprises of three phases: solid particles, water, and air. Solid particles form the significant part and water, and the air is present in the voids in the solid particles. The interaction of these three phases is essential in understanding the index properties of soil. In soil mechanics, the soil is classified using the USCS (Unified Soil Classification System), which depends on index properties. Some important index properties for the different type of soil are-
For Coarse-grained soil-
For Fine-grained soil-
Engineering properties of soil are characteristics that are observable, measurable, and influence behavior to the extent that they are essential in engineering analyses and design. These properties are-
The stress developed in soil is because of the self-weight of the soil and structural loads. The self-weight in the soil is defined by effective stress, defined as the stress which keeps the soil particles together and is the combined effect of pore water pressure and total stress that keeps it together. Stresses due to structural loads are generally calculated by Boussinesq and Westergaard theories.
At last, it can be concluded that soil mechanics is important to understand and identify soil, as it is required in almost all Civil engineering applications. This study becomes even more significant as the properties of soil are heterogeneous and depend on a number of factors.
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