Dynamic structural characteristics and vibration susceptibility of Tongren loess under the influence of water content and confining pressure
Abstract Loess is extensively developed on both sides of the Longwu River, a tributary of the Yellow River, Tongren County, Qinghai Province. The engineering geological characteristics are complex, and landslide disasters are highly developed. Based on field geological surveys and physical property...
Saved in:
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Nature Portfolio
2025-01-01
|
| Series: | Scientific Reports |
| Subjects: | |
| Online Access: | https://doi.org/10.1038/s41598-025-87883-y |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1832571699574341632 |
|---|---|
| author | Changbao Guo Sanshao Ren Yinlong Tan Yaqi Shen |
| author_facet | Changbao Guo Sanshao Ren Yinlong Tan Yaqi Shen |
| author_sort | Changbao Guo |
| collection | DOAJ |
| description | Abstract Loess is extensively developed on both sides of the Longwu River, a tributary of the Yellow River, Tongren County, Qinghai Province. The engineering geological characteristics are complex, and landslide disasters are highly developed. Based on field geological surveys and physical property analysis of the loess in this area, this study analyzes the influence of water content, consolidation pressure, and soil disturbance on the dynamic characteristics of loess using GDS dynamic triaxial tests. The results show that Tongren loess has strong structural properties. Its dynamic constitutive relationship conforms to the Hardin-Dinevich hyperbolic model, where the parameters a and b decrease with increasing confining pressure and increase with increasing water content. The dynamic cohesion and dynamic friction angle both decrease with increasing water content, with the dynamic cohesion significantly affected, decreasing by 77% ~ 83% when saturated. However, the dynamic friction angle is less affected by water content changes, decreasing by 18% ~ 25% when saturated. Under dynamic conditions, the dynamic friction angle of Tongren loess is only 12 ~ 16°, making slopes composed of Tongren loess highly susceptible to instability and sliding under strong earthquake conditions. The dynamic structural properties of Tongren loess are significantly influenced by water content, with increasing water content destroying the joint structural strength of intact loess. Before reaching the plastic limit water content, the joint structural strength of intact loess decreases sharply with increasing water content, and then decreases slowly. The frictional structural strength shows an opposite trend. Under the same experimental conditions, the failure dynamic stress, maximum dynamic elastic modulus, and dynamic shear strength parameters of intact loess are generally greater than those of remolded loess, and the differences between them decrease with increasing water content. This study provides insights into the dynamic structural characteristics of Tongren loess, which can serve as a reference for understanding the formation mechanisms, stability analysis, and seismic design of loess landslides in the region. |
| format | Article |
| id | doaj-art-06bf5c63edd94c00a7f3272d56201af8 |
| institution | Kabale University |
| issn | 2045-2322 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Scientific Reports |
| spelling | doaj-art-06bf5c63edd94c00a7f3272d56201af82025-02-02T12:22:22ZengNature PortfolioScientific Reports2045-23222025-01-0115111610.1038/s41598-025-87883-yDynamic structural characteristics and vibration susceptibility of Tongren loess under the influence of water content and confining pressureChangbao Guo0Sanshao Ren1Yinlong Tan2Yaqi Shen3Institute of Geomechanics, Chinese Academy of Geological SciencesChina University of Geosciences (Beijing)Institute of Geomechanics, Chinese Academy of Geological SciencesInstitute of Geomechanics, Chinese Academy of Geological SciencesAbstract Loess is extensively developed on both sides of the Longwu River, a tributary of the Yellow River, Tongren County, Qinghai Province. The engineering geological characteristics are complex, and landslide disasters are highly developed. Based on field geological surveys and physical property analysis of the loess in this area, this study analyzes the influence of water content, consolidation pressure, and soil disturbance on the dynamic characteristics of loess using GDS dynamic triaxial tests. The results show that Tongren loess has strong structural properties. Its dynamic constitutive relationship conforms to the Hardin-Dinevich hyperbolic model, where the parameters a and b decrease with increasing confining pressure and increase with increasing water content. The dynamic cohesion and dynamic friction angle both decrease with increasing water content, with the dynamic cohesion significantly affected, decreasing by 77% ~ 83% when saturated. However, the dynamic friction angle is less affected by water content changes, decreasing by 18% ~ 25% when saturated. Under dynamic conditions, the dynamic friction angle of Tongren loess is only 12 ~ 16°, making slopes composed of Tongren loess highly susceptible to instability and sliding under strong earthquake conditions. The dynamic structural properties of Tongren loess are significantly influenced by water content, with increasing water content destroying the joint structural strength of intact loess. Before reaching the plastic limit water content, the joint structural strength of intact loess decreases sharply with increasing water content, and then decreases slowly. The frictional structural strength shows an opposite trend. Under the same experimental conditions, the failure dynamic stress, maximum dynamic elastic modulus, and dynamic shear strength parameters of intact loess are generally greater than those of remolded loess, and the differences between them decrease with increasing water content. This study provides insights into the dynamic structural characteristics of Tongren loess, which can serve as a reference for understanding the formation mechanisms, stability analysis, and seismic design of loess landslides in the region.https://doi.org/10.1038/s41598-025-87883-yTongren County, Qinghai ProvinceStructural loessDynamic shear strengthStructural strengthGDS dynamic triaxial tests |
| spellingShingle | Changbao Guo Sanshao Ren Yinlong Tan Yaqi Shen Dynamic structural characteristics and vibration susceptibility of Tongren loess under the influence of water content and confining pressure Scientific Reports Tongren County, Qinghai Province Structural loess Dynamic shear strength Structural strength GDS dynamic triaxial tests |
| title | Dynamic structural characteristics and vibration susceptibility of Tongren loess under the influence of water content and confining pressure |
| title_full | Dynamic structural characteristics and vibration susceptibility of Tongren loess under the influence of water content and confining pressure |
| title_fullStr | Dynamic structural characteristics and vibration susceptibility of Tongren loess under the influence of water content and confining pressure |
| title_full_unstemmed | Dynamic structural characteristics and vibration susceptibility of Tongren loess under the influence of water content and confining pressure |
| title_short | Dynamic structural characteristics and vibration susceptibility of Tongren loess under the influence of water content and confining pressure |
| title_sort | dynamic structural characteristics and vibration susceptibility of tongren loess under the influence of water content and confining pressure |
| topic | Tongren County, Qinghai Province Structural loess Dynamic shear strength Structural strength GDS dynamic triaxial tests |
| url | https://doi.org/10.1038/s41598-025-87883-y |
| work_keys_str_mv | AT changbaoguo dynamicstructuralcharacteristicsandvibrationsusceptibilityoftongrenloessundertheinfluenceofwatercontentandconfiningpressure AT sanshaoren dynamicstructuralcharacteristicsandvibrationsusceptibilityoftongrenloessundertheinfluenceofwatercontentandconfiningpressure AT yinlongtan dynamicstructuralcharacteristicsandvibrationsusceptibilityoftongrenloessundertheinfluenceofwatercontentandconfiningpressure AT yaqishen dynamicstructuralcharacteristicsandvibrationsusceptibilityoftongrenloessundertheinfluenceofwatercontentandconfiningpressure |