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Effects of overconsolidation on the reactivated residual strength of remoulded deep-seated sliding zone soil in the Three Gorges Reservoir Region, China.
- Source :
-
Engineering Geology . Dec2022, Vol. 310, pN.PAG-N.PAG. 1p. - Publication Year :
- 2022
-
Abstract
- Due to the landslide-prone geological conditions, many landslides have occurred in the Three Gorges Reservoir Region (TGRR), most of which are slow-moving ancient landslides characterized by preexisting shear surfaces. In this study, with the purpose of making full use of reactivated residual strength to prevent and treat the slow-moving landslides, such as designing anti-slide piles, the Huangtupo landslide as a typical reactivated ancient landslide in the TGRR was selected to study the overconsolidation (OCR) effect on the reactivated residual strength of deep-seated sliding zone soil by conducting a series of laboratory ring shear tests. It was found that after a short rest of one day, the reactivated residual strength increased with the increase of OCR under a given normal effective stress, but it was lost after a small shear displacement. The overconsolidation effect on reactivated residual strength at a lower stress was more prominent than that at a higher stress. Very coarse sand with a size of 1–2 mm inside the remoulded deep-seated sliding zone soil sample exerts direct control on the reactivated residual strength, and it significantly influences the overconsolidation effect on reactivated residual strength. The results could provide a reliable scientific basis for improving the stability analysis and reinforcement measures of the slow-moving landslides in the TGRR, as well as can be applied to similar slow-moving landslides in other areas. • The reactivated residual strength increased with the increase of OCR after a short rest of one day. • The overconsolidation effect at a lower stress was more prominent than that at a higher stress. • Very coarse sand inside the soil sample significantly influences the overconsolidation effect. [ABSTRACT FROM AUTHOR]
- Subjects :
- *GORGES
*SOIL sampling
*SOILS
*LANDSLIDES
*SABBATH
*LANDSLIDE hazard analysis
Subjects
Details
- Language :
- English
- ISSN :
- 00137952
- Volume :
- 310
- Database :
- Academic Search Index
- Journal :
- Engineering Geology
- Publication Type :
- Academic Journal
- Accession number :
- 159952953
- Full Text :
- https://doi.org/10.1016/j.enggeo.2022.106882