What are three causes of failure of piles?

The failure of the pile foundation may result from any of the following causes:

  • Lack of adequate boring.
  • Inaccurate soil classification.
  • Soft strata under tip of pile.
  • Inadequate driving formula (wrong data)
  • Improper size of hammer cause insufficient penetration, too light or damaged if too heavy.
  • Misinterpretation of load.

What are the methods of pile driving?

Pile Driving Methods (Displacement Piles)

  • Dropping weight.
  • Explosion.
  • Vibration.
  • Jacking (restricted to micro-piling)
  • Jetting.

What is the reason for pile driving?

Pile driving is a critical part of the construction process. Vertical columns made of various materials (wood, concrete, steel, or a combination) are driven into un-excavated soil. The piles are a type of deep foundation used to hold up large structures – often bridges.

What is friction pile?

Friction piles are a type of underground piling system used to create a strong foundation for large, heavy structures such as stadiums, bridges and roads that could not otherwise be supported by the topsoil.

How do you calculate the loading capacity of a pile?

Step 2: compute the ultimate end bearing capacity (acting as individual piles). Ultimate end bearing capacity in clay = Nc × C × pile tip area (Nc = 9). Ultimate end bearing capacity in soft clay = 9 × 120 × π × diameter2/4 = 848.2 lbs/per pile. Total ultimate bearing capacity per pile = 76,920 + 848.2 = 77,768 lbs.

How long does it take to drive piles?

Piles may be completely driven in one operation or, if directed by the state, be allowed to set for 2 to 24 hours (or as indicated on the plans) before driving is resumed. Evaluate the procedure being followed for this project. Piles are either plumb (truly vertical) or battered per the plans.

What is the minimum length of pile?

Minimum dept of pile foundation is 2.5 m and it goes upto any length between 20–25m also but depends on the type of pile and soil strata at founding level.