[1]GUO Wenzhao,LIU Yakun,XU Xiangzhou,et al.Sensitivity on Shear Strength of the Loess in the Ecotone of Wind-Water Erosion[J].Research of Soil and Water Conservation,2018,25(03):23-28.
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Sensitivity on Shear Strength of the Loess in the Ecotone of Wind-Water Erosion
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
25
Number of periods:
2018 03
Page number:
23-28
Column:
Public date:
2018-04-10
- Title:
- Sensitivity on Shear Strength of the Loess in the Ecotone of Wind-Water Erosion
- CLC:
- S157.1
- DOI:
- -
- Abstract:
- The shear strength is not only an important mechanical index of the loess, but also a significant factor associated with gravity erosion.We carried out a series of quick direct shear tests on the remolded loess samples, and then evaluated the sensitivity on the shear strength of the dry density and moisture content using the increase-rate-analysis method. The experimental results reveal that the dry density could markedly affect the shear strength with changes in the cohesive force and internal friction angle, while the moisture content might markedly influence the shear strength with changes in the cohesive force. In addition, the influence of the moisture content on the internal friction angle was small, but that on the cohesive force was obvious. The cohesive force decreased with the increase of the moisture content at an exponential rate. On the other hand, the effect of the cohesive force on the water content was about 18.5 times higher than that on the internal friction angle. Moreover, the sensitivity parameter on the shear strength of the dry density was much larger than that of the moisture content, and the sensitivity of the former was 10 times that of the latter. The results can provide an insight into the mechanics mechanism and process of gravity erosion on the steep loess slope.
- References:
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1900-01-01