its depend on the soil bearing capacity
allowable structural capacity
concrete qty for bulb portion in pile foundation
types of foundation....1. shallow foundation 2. deep foundation 3. pile foundation
Pile foundation is used in case 1. sandy soil or at the places where the safe bearing capacity of the soil is very low 2.The load to be transferred is very high n the foundation area is less 3.Area is earthquake prone 4.Area is waterborne or has water logging problem
There are various reasons such as: 1) Its not possible because pile foundation are designed for 2) Particular life cycle and its specially depends on ground conditions of soil properties. 3) Pile foundation is one part of major foundation in construction where life cycle is required more with another reason are pile foundation is used for which type of structure its also important factor considering time of design. 4) One another major factor is settlement of existing pile foundation is in specific limits or not. Also so many reasons etc. Thanks & Regards HARSHAL.S.KHODE Deputy Manager (QA/QC)
It does not meant that pile foundation is only applicable for soft soils alone. For other type of soils it will not be much economical.
In simple words, It basically determines the load bearing capacity of rock below the earth surface. If soil is weal enough that it can not support the load, then we bore below earth and find out rock location and conduct pile load testing to measure load bearing capacity. For example, pile foundation are provided are provided in highway bridge foundations if soil is weak...... Geotechnical Engineering.......
By placing a plastic vapor barrier before casting the foundation
1.5 times of dia of pile.
It might be Short-board pile ;D
Matt or Raft Foundation Combined Footings Pile Cap Foundations Isolated Foundations Continous Foundation