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Lateral Pressure and Stiffness Calculation for Pile

 
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deepakm
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Joined: 06 Mar 2018
Posts: 1

PostPosted: Tue Mar 06, 2018 11:06 am    Post subject: Lateral Pressure and Stiffness Calculation for Pile Reply with quote

1. How to calculate lateral pressure acting on the pile due to surcharge loading of 50 t/m2. This Surcharge loading is placed in loose sand.
2. How to calculate the vertical and horizontal spring stiffness for the pile due to soil.
3.What is the permissible slope or angle for Raker pile.
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es_jayakumar
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Joined: 24 Nov 2011
Posts: 1245
Location: Cochin

PostPosted: Sun Mar 11, 2018 7:10 am    Post subject: Reply with quote

1.     I hope,  the lateral earth pressure acting on the pile can be calculated similar to that on a retaining wall : Surcharge pressure on pile = Surcharge Load x Coefficient of Lateral Earth Pressure at Rest (as the pile is rigid).

2.     Vertical spring stiffness ofa friction  pile = Pile working Load / Permissible Settlement. This method is commonly adopted. The same of an end bearing concrete pile ( where the stiffness  of concrete governs the settlement) = AE/L . The  horizontal spring stiffness value is governed by the Modulus of Horizontal Subgrade Reaction. The pile head deflection and horizontal stiffness can be computed using the formulae given in  “IS 2911 (Part 1/Sec 1) : 2010  DESIGN AND CONSTRUCTION OF PILE FOUNDATIONS — CODE OF PRACTICE, PART 1: CONCRETE PILES , Section 1: Driven Cast In-situ Concrete Piles”. Please elucidate, for what purpose you require the horizontal stiffness. Looking for this at pile head, or in segments to which the pile is assumed to be divided for analysis using software ?

3.     The above code, at section 6.5.3 lays down “Generally the rake will be limited to 1 horizontal to 6 vertical”.
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