Effect of Underreamed Pervious Concrete Columns on Load-Carrying Capacity of Loose Cohesionless Soils
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VIEW THE REPLYPublication: International Journal of Geomechanics
Volume 23, Issue 3
Abstract
Weak confinement governs the bulging failure of granular columns. Pervious concrete columns have granular columns like drainage with stiffness of concrete column are thus independent of the confinement from the weak surrounding soil can be treated as an alternative solution. Moreover, it is well established that under-reaming bulb enhances the bearing resistance to the pile shaft. Therefore, the present experimental and analytical study investigates circular pervious concrete column (CPCC) and under-reamed pervious concrete column (UPCC) in improving the bearing capacity of loose pond ash fill. CPCC and UPCC are constructed in a model pond ash fill subjected to vertical loading. The load-carrying capacity, settlement failure mechanism, and consolidation parameters were examined. Theoretical analysis for evaluating the load-carrying improvement factor (LCF) with nondimensional parametric variation of area replacement ratio (Ra), underreamed bulb ratio (Br), and length ratio of the column (RL) was also done. Efficacy of CPCC was also numerically studied (Plaxis 3D). Experimental results show that the vertical settlement is reduced by 52.8% with CPCC and UPCC. UPCC renders higher load-carrying capacity than CPCC. Both CPCC and UPCC undergo deformation at depth of 4D during failure. For the same area replacement ratio (Ra), the experimental and theoretically computed values are found in good agreement. The rate of consolidation is reduced from 53 to 23 days by using CPCC signifying its drainage potential.
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Acknowledgments
The authors are grateful to the principal of the DAV Institute of Engineering and Technology for granting the permission to work in the Civil Engineering laboratory. The authors also acknowledge the manual help received from the lab technicians during the model tank testing. The authors are also thankful to the reviewers for the suggestions, modifications, and corrections that have improved the overall manuscript.
Notation
The following symbols are used in this paper:
- A
- area of the column;
- Ab
- area of the underreamed bulb;
- Ac
- surface area of the column;
- Ap
- area of the circular plate;
- Au
- unit cell area;
- as
- area of the stone column;
- Br
- underreamed bulb ratio;
- D
- diameter of the column;
- Db
- underreamed bulb ratio;
- Du
- circular plate diameter;
- fs
- skin friction resistance;
- K
- coefficient of permeability;
- K
- lateral earth pressure coefficient;
- L
- length of the pervious concrete column;
- L/D
- length to diameter ratio of stone column;
- Le
- effective length;
- Nq
- bearing capacity factor;
- Qf
- total applied load;
- qf
- ultimate load-carrying capacity at failure of untreated soil;
- (qf)u
- ultimate load-carrying capacity at failure of treated soil;
- Ra
- area replacement ratio;
- Rb
- resistance force offered by the bulb;
- Rbd
- bearing capacity reduction factor;
- RD
- relative density;
- Rf
- skin friction force;
- RL
- length ratio of the column;
- Rs
- resistance force offered from soil below the circular plate;
- Rt
- tip resistance force of the column;
- rd
- reduction factor;
- S/Dc
- settlement ratio (total settlement to diameter of concrete column);
- U
- degree of consolidation;
- U0
- initial excess pore water pressure;
- Ut
- excess pore water pressure at any time t0;
- Z
- depth of the soil;
- δ
- friction between soil and pile (interface);
- ϕ
- angle of internal friction;
- γ
- unit weight of soil;
- σ′
- effective overburden pressure; and
- σavg
- average effective overburden pressure.
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Published In
International Journal of Geomechanics
Volume 23 • Issue 3 • March 2023
Copyright
© 2022 American Society of Civil Engineers.
History
Received: Jan 16, 2022
Accepted: Sep 21, 2022
Published online: Dec 21, 2022
Published in print: Mar 1, 2023
Discussion open until: May 21, 2023
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