| Analysis of influence factors on the shearing strength of the topsoil of sloped farmland of gully regions in the Loess Plateau area |
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| DOI：10.7606/j.issn.1000-7601.2010.03.43 |
| Key Words: sloped farmland topsoil shearing strength water content rainfall intensity gradient |
| Author Name | Affiliation | | YAO Jun | College of Resources and Environment , Northwest A & F University, Yangling, Shaanxi 712100, China | | WU Faqi | College of Resources and Environment , Northwest A & F University, Yangling, Shaanxi 712100, China | | SONG Juanli | College of Resources and Environment , Northwest A & F University, Yangling, Shaanxi 712100, China | | SHE Diao | College of Resources and Environment , Northwest A & F University, Yangling, Shaanxi 712100, China | | LI Guanglu | College of Resources and Environment , Northwest A & F University, Yangling, Shaanxi 712100, China |
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| Abstract: |
| Taking the sloped farmland of Chunhua County as the object , under the situation of the manual simula-tion rainmaking, and the designed rainfall intensity as following: 0.5, 1.0, 1.5, 2.0 mm/min and 2.5 mm/min, dura-tion of rainfall: 40 min, and the designed slope gradient as following: 5°, 8°, 11°, 15° and 20° , this paper analyzes the
three main factors: water content, rainfall intensity and gradient, which influences the shearing strength of the topsoil of sloped farmland of the gully region in the Loess Plateau area. The results show that, after the rainmaking, the shearing strength will increase with the decreasing of the water content of the topsoil. The pertinence between these two factors is pretty obvious . The rainfall intensity has less influence on the shearing strength. When the gradient is small, the shearing strength will decrease with the increase of the gradient. When the gradient reaches 15°or more, the shearing strength will increase with the increase of the gradient. |
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