QAQC CIVIL ENGINEERING

Here I am trying to explain how is pile set calculated by using modified Hiley formula.  The principle of this method is a large weight giving dynamic impact to the elastic body. It equates the energy of hammer blow to work done in overcoming the total resistance offered by the penetrated soil. Allowance is made for losses of energy due to the elastic compression of the cap material, pile and subsoil as well as losses caused by the inertia of the pile. Reference Code: IRC:78-2014 The modified Hiley formula is : Where R = ultimate driving resistance in tonnes. The safe load shall be worked out by dividing it with a factor of safety of 2.5. W = mass of the ram in Mt; h = height of the free fall of the ram or hammer in cm, taken at its full value for trigger-operated drop hammers, 80 percent of the fall of normally proportioned winch operated drop hammers, and 90 percent of the stroke for single-acting hammers.  When using the McKiernanTerry type of double acting hamme...