Abstract
To evaluate the liquefaction resistance of unsaturated soils by a triaxial system, it is suggested to keep a p-constant condition rather than the rh-constant condition (i.e., cell pressure constant) that is normally applied to the same test for saturated specimen. The main concern is that the pore pressure coefficient (B value) of unsaturated specimens may be far less than unity, which causes undesired effects on the behaviors of unsaturated soils. A modified triaxial system that can maintain the p-constant condition has been recently developed. By using the system, the behaviors of an unsaturated soil subjected to undrained cyclic triaxial loading are compared between the p-constant condition and the rh-constant condition, which implies that the testing conditions affect behaviors of pore pressures generation, stress strain relationship, etc. Results suggest that tests under the rh-constant condition underestimate the liquefaction resistance of soils. In addition, the modified triaxial system could effectively reduce the variation of p by more than 60 % in the full tested range, or by 75 % in a range with relatively small magnitude of the vertical loading based on test results of three sandy soils.
| Original language | English |
|---|---|
| Pages (from-to) | 710-718 |
| Number of pages | 9 |
| Journal | Geotechnical Testing Journal |
| Volume | 40 |
| Issue number | 4 |
| DOIs | |
| Publication status | Published - 2017 Jan 1 |
| Externally published | Yes |
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Keywords
- P-constant condition
- Undrained cyclic triaxial test
- Unsaturated soil
ASJC Scopus subject areas
- Geotechnical Engineering and Engineering Geology
Cite this
P-constant condition applied to undrained cyclic triaxial test of unsaturated soils. / Wang, Hailong; Koseki, J.; Sato, T.
In: Geotechnical Testing Journal, Vol. 40, No. 4, 01.01.2017, p. 710-718.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - P-constant condition applied to undrained cyclic triaxial test of unsaturated soils
AU - Wang, Hailong
AU - Koseki, J.
AU - Sato, T.
PY - 2017/1/1
Y1 - 2017/1/1
N2 - To evaluate the liquefaction resistance of unsaturated soils by a triaxial system, it is suggested to keep a p-constant condition rather than the rh-constant condition (i.e., cell pressure constant) that is normally applied to the same test for saturated specimen. The main concern is that the pore pressure coefficient (B value) of unsaturated specimens may be far less than unity, which causes undesired effects on the behaviors of unsaturated soils. A modified triaxial system that can maintain the p-constant condition has been recently developed. By using the system, the behaviors of an unsaturated soil subjected to undrained cyclic triaxial loading are compared between the p-constant condition and the rh-constant condition, which implies that the testing conditions affect behaviors of pore pressures generation, stress strain relationship, etc. Results suggest that tests under the rh-constant condition underestimate the liquefaction resistance of soils. In addition, the modified triaxial system could effectively reduce the variation of p by more than 60 % in the full tested range, or by 75 % in a range with relatively small magnitude of the vertical loading based on test results of three sandy soils.
AB - To evaluate the liquefaction resistance of unsaturated soils by a triaxial system, it is suggested to keep a p-constant condition rather than the rh-constant condition (i.e., cell pressure constant) that is normally applied to the same test for saturated specimen. The main concern is that the pore pressure coefficient (B value) of unsaturated specimens may be far less than unity, which causes undesired effects on the behaviors of unsaturated soils. A modified triaxial system that can maintain the p-constant condition has been recently developed. By using the system, the behaviors of an unsaturated soil subjected to undrained cyclic triaxial loading are compared between the p-constant condition and the rh-constant condition, which implies that the testing conditions affect behaviors of pore pressures generation, stress strain relationship, etc. Results suggest that tests under the rh-constant condition underestimate the liquefaction resistance of soils. In addition, the modified triaxial system could effectively reduce the variation of p by more than 60 % in the full tested range, or by 75 % in a range with relatively small magnitude of the vertical loading based on test results of three sandy soils.
KW - P-constant condition
KW - Undrained cyclic triaxial test
KW - Unsaturated soil
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UR - http://www.scopus.com/inward/citedby.url?scp=85026367097&partnerID=8YFLogxK
U2 - 10.1520/GTJ20160115
DO - 10.1520/GTJ20160115
M3 - Article
AN - SCOPUS:85026367097
VL - 40
SP - 710
EP - 718
JO - Geotechnical Testing Journal
JF - Geotechnical Testing Journal
SN - 0149-6115
IS - 4
ER -