[1]Xu Shengxian,Zhang Qingwei,Li Wenling,et al.Comparative Analysis of Soil Shear Strength Measured by Strain-Controlled Direct Shear Apparatus and Micro-Vane Shear Apparatus[J].Research of Soil and Water Conservation,2024,31(04):205-213.[doi:10.13869/j.cnki.rswc.2024.04.023]
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Comparative Analysis of Soil Shear Strength Measured by Strain-Controlled Direct Shear Apparatus and Micro-Vane Shear Apparatus
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
31
Number of periods:
2024 04
Page number:
205-213
Column:
Public date:
2024-06-30
- Title:
- Comparative Analysis of Soil Shear Strength Measured by Strain-Controlled Direct Shear Apparatus and Micro-Vane Shear Apparatus
- Keywords:
- strain-controlled direct shear apparatus; micro-vane shear apparatus; shear force; cohesion; internal friction angle
- CLC:
- S152.9
- DOI:
- 10.13869/j.cnki.rswc.2024.04.023
- Abstract:
- [Objective]This study aims to analyze the characteristics of soil shear strength parameters obtained by strain-controlled direct shear apparatus and micro-vane shear apparatus, respectively(soil cohesive force c, internal friction angle φ, and soil shear force τ), and then establish the relationship between c, φ and τ. This can deepen the understanding of soil shear strength, and have important significance for improving the efficiency of soil shear strength measurement. [Methods]Three typical texture types of soil(Yangling clayey soil, Ansai loessial soil, Dingbian sandy soil)from the Loess Plateau, and five levels of soil moisture(12%, 16%, 20%, 24% and 28%)were designed to obtained their soil shear strength using the above mentioned apparatuses. The responses of soil shear strength to soil types and soil moisture, as well as relationships between c, φ and τ were then analyzed. [Results](1)Under experiment conditions, the values of c, φ and τ range between 16.88～27.12 kPa, 5.03°～21.30°, 1.76～7.72 kPa, respectively.(2)In the three soil types, the c and τ firstly increase and then decrease with the increase of soil moisture. While, the φ decreases gradually with the soil moisture increase.(3)The c, τ, and φ of Ansai loessial soil are similar or slightly higher than those in Dingbian sandy soil, while they are significantly higher than those in Yangling clay soil.(4)In the three types of soil, there is a significant linear correlation between the τ and c(R2>0.93), while there is no significant correlation between the φ and τ. Without considering the difference of soil type, there is still a strong linear correlation between τ and c, and its relation can be described by c=1.59τ+14.10(R2=0.51, p<0.01). [Conclusion]The responses of c to soil type and soil moisture were similar to that of τ, and a significant relation are found between c and τ. It implies that researchers can use τ, conveniently obtained by micro-vane shear apparatus, to assess c, obtained by strain-controlled direct shear apparatus slowly under some conditions. The results can provide reference for improving the measurement efficiency of soil shear strength under extreme field conditions.
- References:
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Last Update:
2024-06-30