Behavior of Coarse Widely Graded Soils under Low Confining Pressures
| العنوان: | Behavior of Coarse Widely Graded Soils under Low Confining Pressures |
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| المؤلفون: | Li Min Zhang, H.F. Zhao, Dongsheng Chang |
| المصدر: | Journal of Geotechnical and Geoenvironmental Engineering. 139:35-48 |
| بيانات النشر: | American Society of Civil Engineers (ASCE), 2013. |
| سنة النشر: | 2013 |
| مصطلحات موضوعية: | Void ratio, Consolidation (soil), Lateral earth pressure, Soil water, Isotropy, Geotechnical engineering, Landslide, Geotechnical Engineering and Engineering Geology, Soil gradation, Geology, General Environmental Science, Colluvium |
| الوصف: | Colluvial soils are usually coarse and widely graded. Shallow-seated failures occur frequently in colluvial soil deposits duringrain- fallinfiltration.Thispaperinvestigatesthebehaviorofcoarse,widelygradedsoilsunderverylowconfiningpressuresof5e25 kPa encountered in shallow-seated failures. Isotropic consolidation tests, drained triaxial tests, and undrained triaxial tests were conducted on several widely graded soils with different coarse contents but with the same void ratio of 0.62. With increasing coarse content, the soil microstructure changes froma fines-controlledstructuretoacoarse-controlledstructureafteracriticalcoarsecontentofapproximately70%.Siltysandwithgravelwith acoarsecontentclosetothecriticalvalueexhibitsthehighestcompressibilitybecauseofthepresenceoflargeinteraggregatepores.Evenunder very low confining pressures, such soil still shows strong contractive behavior during drained loading, and generates large positive pore-water pressures during undrained loading. This explains why shallow-seated failures occur frequently in colluvial soil deposits caused by rainfall infiltration.Soilswithlowerorhighercoarsecontentsthanthecriticalvaluemayshowdilativebehaviorunderthesamelowconfiningpressures. The critical statefriction angle increases with thecoarse content.DOI:10.1061/(ASCE)GT.1943-5606.0000755.©2013American Society of Civil Engineers. CE Database subject headings: Coarse-grained soils; Compression; Landslides; Microstructure; Shear strength; Soil compaction; Soil pressure. |
| تدمد: | 1943-5606 1090-0241 |
| DOI: | 10.1061/(asce)gt.1943-5606.0000755 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_________::0e6130a917a73fd3110d46e45f6a3bf1 https://doi.org/10.1061/(asce)gt.1943-5606.0000755 |
| رقم الانضمام: | edsair.doi...........0e6130a917a73fd3110d46e45f6a3bf1 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 19435606 10900241 |
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| DOI: | 10.1061/(asce)gt.1943-5606.0000755 |