Experiment on anti-eroding property of reinforced loess with wheat straw(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2017年01期
- Page:
- 24-32
- Research Field:
- 道路工程
- Publishing date:
Info
- Title:
- Experiment on anti-eroding property of reinforced loess with wheat straw
- Author(s):
- LU Hao; YAN Chang-gen; YANG Xiao-hua; XUE Xiao-hui
- 1. School of Highway, Chang’an University, Xi’an 710064, Shaanxi, China; 2. Shanxi Transportation Research Institute, Taiyuan 030006, Shanxi, China
- Keywords:
- road engineering; loess slope; wheat straw reinforced loess; shear strength; disintegration ratio; anti-scouring coefficient; simulated rainfall test
- PACS:
- U416.14
- DOI:
- -
- Abstract:
- Erosion of loess highway slope, which is caused by heavy rain, is to be solved by reinforcing loess with wheat straw and lime to protect the loess highway slope. In order to study the anti-eroding property and protective effect of reinforced loess with wheat straw, some samples were prepared, including undisturbed loess, reinforced loess with wheat straw, and reinforced loess with wheat straw and lime. Then direct shear tests, disintegration tests and anti-scouring tests were carried out to analyze the shear strength, disintegration and anti-scouring were analyzed and to evaluate the performance of anti-erosion of reinforced loess with wheat straw. Finally, simulated rainfall comparison tests were conducted to verify the protection effect of the reinforced loess with wheat straw. The results show that reinforcement with wheat straw enhances the shear strength of soil. To be specific, cohesion has an obvious growth trend with the growth of age, and the maximum increment of cohesion reaches to 311.6%; the growth trend of frictional angles is not significant, and the maximum increment of frictional angle reaches approximately to 50%; the cohesion and frictional angles of reinforced loess with wheat straw and lime increase by 44.5% and 19.8% compare with that without lime, which indicates that lime improves the reinforcement effect of wheat straw. In disintegration tests and anti-scouring tests, reinforcement with wheat straw reduces the disintegration ratio of soil, and enhances the anti-scouring coefficient, the minimum disintegration ratio decreases by 79.9% while the maximum anti-scouring coefficient increases by 156.9%; the anti-scouring and anti-eroding ability of soil are improved significantly; lime enhances the anti-scouring and anti-eroding ability of the reinforced loess with wheat straw. The protection effect of the reinforced loess with wheat straw is significant, the maximum decreasing ratio of accumulated erosion amount reaches to 41.9%, and the protection effect of the reinforced loess with wheat straw and lime is better than that without lime. Reinforcement loess with wheat straw is one of effective means for protecting loess slope, which is worth to be popularized.
Last Update: 2017-01-21