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Stiffening Effect on Settlement Reduction for a Single Partially Stiffened Floating Granular Pile

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Abstract

With increasing rate of development and limitation of land, it becomes necessary to use those areas where typical weak soil conditions occur. One needs to look upon some economic and feasible options for the provision of foundation, and one of the options available is to use the granular pile (GP). This paper presents analysis of a single partially stiffened floating pile. Partial stiffening means replacement of material in the top region of pile by some material, having good mechanical properties, i.e., higher deformation modulus, e.g., RCC, PCC in comparison with conventional material of granular pile, thus not only providing the solution for bulging at the top but also helping in increasing the load-carrying capacity of the GP. In this paper, the variation in settlement reduction factor is analyzed with relative length, relative stiffness of GP, stiffening parameters and is found to decrease with the increase in stiffening parameters.

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Abbreviations

GP:

Granular pile

L :

Length of granular pile

‘n’:

Total number of elements of GP

d :

(2a) Diameter of granular pile

L/d :

Relative length

P :

Load on GP

E gp :

Deformation modulus of granular pile material

E s :

Deformation modulus of soil

ν s :

Poisson’s ratio of soil

K gp :

Relative stiffness of granular pile = (Egp/Es)

p b :

Pile base pressure

η :

Ls/L (where Ls is the length of the pile stiffened from the top of the pile) (0 ≤ η ≤ 1) percentage length of stiffening from top

χ :

(Kgp of stiffened top portion of GP/Kgp of the un-stiffened portion of GP) stiffening factor (χ > 1, for stiffening)

β F :

Settlement reduction factor

τ :

Shear stress

τ*:

(τ(πdL)/P), normalized shear stresses of GP

z :

Depth of granular pile section taken from the top of granular pile

z* (= z/L):

Normalized depth of GP

Δz 1 and Δz 2 :

Standard notation of unequal spacing used for finite difference

Δz :

Element length or distance between successive nodes

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Authors and Affiliations

  1. Civil Engineering Department, University Department, Rajasthan Technical University, Kota, Rajasthan, 324010, India

    Vaibhaw Garg, Jitendra Kumar Sharma & Kamal Deep Singh Grover

Authors
  1. Vaibhaw Garg
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  2. Jitendra Kumar Sharma
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  3. Kamal Deep Singh Grover
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Correspondence to Vaibhaw Garg.

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Garg, V., Sharma, J.K. & Grover, K.D.S. Stiffening Effect on Settlement Reduction for a Single Partially Stiffened Floating Granular Pile. J. Inst. Eng. India Ser. A 100, 131–138 (2019). https://doi.org/10.1007/s40030-018-0346-z

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  • DOI: https://doi.org/10.1007/s40030-018-0346-z

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