Abstract
Natural soils are often deposited in layers and homogeneous soils which are very rarely found in nature. Thus, bearing capacity of layered soil cannot be treated anymore as single soil since the soil strength and stiffness parameters are different and increase their linearly with depth. There are two cases which can be consider as inhomogeneous layer soil where strong clay overlaying weak clay layers or weak clay overlaying strong clay layers. A parametric study was conducted to assess the ultimate bearing capacity of a smooth strip footing subjected to vertical load resting on two undrained clays layered soil. A two dimensional (2D) plane strain model incorporated in COMSOL Multiphysics (version 4.3a) which a finite element software was adopted with two physical branches that have been chosen. Two clays layered soil were assumed as linear elastic incompressible material which failed in the Mohr-Coulomb criterion. The finite element results were presented in terms of a modified bearing capacity factor for different ratios of top layer thickness, strength and stiffness ratio of two clay layers. The computation results were then compared to published studies. The numerical analysis showed that strong clay overlaying weak clay layers with c1/c2 >1 resulted in increase of Nc* as h/B ratio increase. In contrast, for a case where weak clay overlaying strong clay layers with c1/c2 <1 showed decrease of Nc* as h/B ratio increase. In comparing results of bearing capacity factor, Nc* indicated a similar trend from previous studies. Stiffness parameters did not affect the solutions as long as remain constant for all cases within suitable ranges of parameters.
| Original language | English |
|---|---|
| Title of host publication | Applied Mechanics and Materials |
| Publisher | Trans Tech Publications Ltd |
| Pages | 675-680 |
| Number of pages | 6 |
| Volume | 567 |
| ISBN (Print) | 9783038351238 |
| DOIs | |
| Publication status | Published - 2014 |
Publication series
| Name | Applied Mechanics and Materials |
|---|---|
| Volume | 567 |
| ISSN (Print) | 16609336 |
| ISSN (Electronic) | 16627482 |
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Keywords
- COMSOL Multiphysics
- Layered soil
- Ultimate bearing capacity
ASJC Scopus subject areas
- Engineering(all)
Cite this
Assessment on bearing capacity of two clay layers soil using COMSOL. / Md Nujid, Masyitah; Taha, Mohd. Raihan.
Applied Mechanics and Materials. Vol. 567 Trans Tech Publications Ltd, 2014. p. 675-680 (Applied Mechanics and Materials; Vol. 567).Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
}
TY - GEN
T1 - Assessment on bearing capacity of two clay layers soil using COMSOL
AU - Md Nujid, Masyitah
AU - Taha, Mohd. Raihan
PY - 2014
Y1 - 2014
N2 - Natural soils are often deposited in layers and homogeneous soils which are very rarely found in nature. Thus, bearing capacity of layered soil cannot be treated anymore as single soil since the soil strength and stiffness parameters are different and increase their linearly with depth. There are two cases which can be consider as inhomogeneous layer soil where strong clay overlaying weak clay layers or weak clay overlaying strong clay layers. A parametric study was conducted to assess the ultimate bearing capacity of a smooth strip footing subjected to vertical load resting on two undrained clays layered soil. A two dimensional (2D) plane strain model incorporated in COMSOL Multiphysics (version 4.3a) which a finite element software was adopted with two physical branches that have been chosen. Two clays layered soil were assumed as linear elastic incompressible material which failed in the Mohr-Coulomb criterion. The finite element results were presented in terms of a modified bearing capacity factor for different ratios of top layer thickness, strength and stiffness ratio of two clay layers. The computation results were then compared to published studies. The numerical analysis showed that strong clay overlaying weak clay layers with c1/c2 >1 resulted in increase of Nc* as h/B ratio increase. In contrast, for a case where weak clay overlaying strong clay layers with c1/c2 <1 showed decrease of Nc* as h/B ratio increase. In comparing results of bearing capacity factor, Nc* indicated a similar trend from previous studies. Stiffness parameters did not affect the solutions as long as remain constant for all cases within suitable ranges of parameters.
AB - Natural soils are often deposited in layers and homogeneous soils which are very rarely found in nature. Thus, bearing capacity of layered soil cannot be treated anymore as single soil since the soil strength and stiffness parameters are different and increase their linearly with depth. There are two cases which can be consider as inhomogeneous layer soil where strong clay overlaying weak clay layers or weak clay overlaying strong clay layers. A parametric study was conducted to assess the ultimate bearing capacity of a smooth strip footing subjected to vertical load resting on two undrained clays layered soil. A two dimensional (2D) plane strain model incorporated in COMSOL Multiphysics (version 4.3a) which a finite element software was adopted with two physical branches that have been chosen. Two clays layered soil were assumed as linear elastic incompressible material which failed in the Mohr-Coulomb criterion. The finite element results were presented in terms of a modified bearing capacity factor for different ratios of top layer thickness, strength and stiffness ratio of two clay layers. The computation results were then compared to published studies. The numerical analysis showed that strong clay overlaying weak clay layers with c1/c2 >1 resulted in increase of Nc* as h/B ratio increase. In contrast, for a case where weak clay overlaying strong clay layers with c1/c2 <1 showed decrease of Nc* as h/B ratio increase. In comparing results of bearing capacity factor, Nc* indicated a similar trend from previous studies. Stiffness parameters did not affect the solutions as long as remain constant for all cases within suitable ranges of parameters.
KW - COMSOL Multiphysics
KW - Layered soil
KW - Ultimate bearing capacity
UR - http://www.scopus.com/inward/record.url?scp=84903530594&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84903530594&partnerID=8YFLogxK
U2 - 10.4028/www.scientific.net/AMM.567.675
DO - 10.4028/www.scientific.net/AMM.567.675
M3 - Conference contribution
SN - 9783038351238
VL - 567
T3 - Applied Mechanics and Materials
SP - 675
EP - 680
BT - Applied Mechanics and Materials
PB - Trans Tech Publications Ltd
ER -