Instability of Compacted Residual Soil
Static liquefaction of loose sands has been observed to initiate at stress ratios far less than the steady-state stress ratio. Different collapse surface concepts largely based on undrained triaxial test results have been proposed in the literature to explain the above instability phenomenon of loos...
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MDPI AG
2021-09-01
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| Series: | Geosciences |
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| Online Access: | https://www.mdpi.com/2076-3263/11/10/403 |
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| author | Sainulabdeen Mohamed Junaideen Leslie George Tham Chack Fan Lee |
| author_facet | Sainulabdeen Mohamed Junaideen Leslie George Tham Chack Fan Lee |
| author_sort | Sainulabdeen Mohamed Junaideen |
| collection | DOAJ |
| description | Static liquefaction of loose sands has been observed to initiate at stress ratios far less than the steady-state stress ratio. Different collapse surface concepts largely based on undrained triaxial test results have been proposed in the literature to explain the above instability phenomenon of loose sands. Studies of the instability behavior of fill material derived from residual soils remain limited. The present study investigated the instability behavior of a compacted residual soil using the conventional undrained triaxial tests and specially equipped constant shear triaxial tests. The test results were characterized in the <i>p’: q: v</i> space using the current state parameter with respect to the steady-state line for the residual soil. A modified collapse surface that has gradients varying with <i>p’</i> and <i>v</i> was proposed for the loose residual soil to represent the instability states of undrained loading. Under constant shear stress conditions, the soil can mobilize stress ratios higher than those defined by the modified collapse surface. An instability surface was therefore presented for the instability states reached in static loading. Further, an alternative method of deducing the instability surface from the undrained stress paths was introduced. |
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| format | Article |
| id | doaj.art-bc393f3a87d54532a0b1f2e5307b6583 |
| institution | Directory Open Access Journal |
| issn | 2076-3263 |
| language | English |
| last_indexed | 2024-03-10T06:33:03Z |
| publishDate | 2021-09-01 |
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| series | Geosciences |
| spelling | doaj.art-bc393f3a87d54532a0b1f2e5307b65832023-11-22T18:23:24ZengMDPI AGGeosciences2076-32632021-09-01111040310.3390/geosciences11100403Instability of Compacted Residual SoilSainulabdeen Mohamed Junaideen0Leslie George Tham1Chack Fan Lee2Department of Civil Engineering, South Eastern University of Sri Lanka, Oluvil 32360, Sri LankaDepartment of Civil Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong, ChinaDepartment of Civil Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong, ChinaStatic liquefaction of loose sands has been observed to initiate at stress ratios far less than the steady-state stress ratio. Different collapse surface concepts largely based on undrained triaxial test results have been proposed in the literature to explain the above instability phenomenon of loose sands. Studies of the instability behavior of fill material derived from residual soils remain limited. The present study investigated the instability behavior of a compacted residual soil using the conventional undrained triaxial tests and specially equipped constant shear triaxial tests. The test results were characterized in the <i>p’: q: v</i> space using the current state parameter with respect to the steady-state line for the residual soil. A modified collapse surface that has gradients varying with <i>p’</i> and <i>v</i> was proposed for the loose residual soil to represent the instability states of undrained loading. Under constant shear stress conditions, the soil can mobilize stress ratios higher than those defined by the modified collapse surface. An instability surface was therefore presented for the instability states reached in static loading. Further, an alternative method of deducing the instability surface from the undrained stress paths was introduced.https://www.mdpi.com/2076-3263/11/10/403instabilitystatic liquefactiontriaxial testconstant shearresidual soilcollapse surface |
| spellingShingle | Sainulabdeen Mohamed Junaideen Leslie George Tham Chack Fan Lee Instability of Compacted Residual Soil Geosciences instability static liquefaction triaxial test constant shear residual soil collapse surface |
| title | Instability of Compacted Residual Soil |
| title_full | Instability of Compacted Residual Soil |
| title_fullStr | Instability of Compacted Residual Soil |
| title_full_unstemmed | Instability of Compacted Residual Soil |
| title_short | Instability of Compacted Residual Soil |
| title_sort | instability of compacted residual soil |
| topic | instability static liquefaction triaxial test constant shear residual soil collapse surface |
| url | https://www.mdpi.com/2076-3263/11/10/403 |
| work_keys_str_mv | AT sainulabdeenmohamedjunaideen instabilityofcompactedresidualsoil AT lesliegeorgetham instabilityofcompactedresidualsoil AT chackfanlee instabilityofcompactedresidualsoil |