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- Title
牡蛎壳粉改良膨胀土的工程特性及 微观机理研究.
- Authors
黄震; 边林林; 刘莹; 周维政; 马少坤
- Abstract
In order to explore the improvement effect of solid waste oyster shell powder on the engineering characteristics of expansive soil, taking Ningming expansive soil in Guangxi as the research object, a series of expansion and shrinkage tests, and direct shear tests under wet-dry cycle conditions were carried out on the expansive soil with oyster shell powder content of 0%, 3%, 6%, 9% and 12% respectively. The microstructure characteristics of expansive soil before and after improvement were analyzed by SEM tests. The test results show that oyster shell powder can effectively reduce the expansion and contraction of soil and improve the cohesion of soil. The free swelling ratio, no loading swelling ratio, loading swelling ratio, swelling force and linear shrinkage ratio of soil decrease with the increase of oyster shell powder content, and have a stable trend when the oyster shell powder content is 9%. When the content of oyster shell powder is 9%, the cohesion of soil reaches the peak. The cohesion of all mixed soil decreased with the increase of wet-dry cycle times, and tended to be stable when the wet-dry cycle was 4 times, and the decrease range of cohesion of soil mixed with oyster shell powder was lower than that of soil without mixing. After six wet-dry cycles, the cohesion of the soil with 9% oyster shell powder increased by 42.38% compared with the soil without oyster shell powder. The variation regularity of internal friction angle of soil is not obvious, but on the whole, the internal friction angle of soil mixed with oyster shell powder is greater than that of soil without oyster shell powder. The microscopic results show that the addition of oyster shell powder enhances the stability of soil and slows down the development of cracks and pores of expansive soil after wet-dry cycle. Oyster shell powder has a certain modification effect on the swelling shrinkage characteristics and strength characteristics of expansive soil. The research results provide theoretical basic data for improving expansive soil with oyster shell powder.
- Subjects
GUANGXI Zhuangzu Zizhiqu (China); OYSTER shell; SWELLING soils; SOIL cohesion; STRUCTURAL shells; INTERNAL friction; COHESION; EXPANSION &; contraction of concrete
- Publication
Journal of Railway Science & Engineering, 2023, Vol 20, Issue 5, p1729
- ISSN
1672-7029
- Publication type
Article
- DOI
10.19713/j.cnki.43-1423/u.T20220987