Geomechanics is technical discipline which applies rules of mechanics deformation body in civil engineering meaning.

Soil is natural mixture of mineral grains which can be separate on the way of mechanics. Frequently soil is uncemented gathering of granular material like are mineral and organic sources.

Soil appears as product of many chemical, physical and mechanics processes of decomposed areas of rock (stone) parts which are exposed outside influences. Grains of soil appear in cyclic process of decomposed hard rocks (stones) because of  temperature changes, Sun, water and chemical processes. Basicly, destructive processes which contains in creation of soil can be physical and chemicals.Physical processes- are participating in decomposing of fundamental stone (rock) to fragments, and little pieces of stones different dimensions. Frozen water in fissures causing a  high level voltage and in that way the fragments become bigger so they are separated from the stone mass. Cyclic freezing and melting can cause demotion in the big depth. Also, the temperature differences causing changes of voltage and they can cause decomposing stone fragments. We must mention that physical processes which are participating in genesis of soil can be described by erosion of wind, water and glacier.

Chemical processes causing a change type of mineral of fundamental stone because of water, special if there is some traces of acid, bases, and carbon dioxide. A huge number of minerals can be classify in four fundamental groups;

1. Relative strong and stable minerals for example quartz, feldspar. Which are forming sand and gravel
2. Less strong but also stable silicate
3. Soft and shelled aluminium silicate
4. Very soft minerals of clay

Soils as we find in nature, can be classified as a transport soils and residual soil .Transport soils are made up on one place, and later they are transported and deposit on another place. And residual soil is made up by staying on the place where the stone is crashed up.
The most important factors are:
Gravity, water, wind and glacier. As we mention before they are influencing on creating of transport soil.
In another way, residual soil is created by climatic and tectonic conditions when the speed of decomposing fundamental stone is much higher of speed already formed stone.