Mechanical properties of black soil after straw incorporation: Effect of straw mixing amount.

doi:10.13287/j.1001-9332.201709.019

Abstract

Abstract: Aiming to explore how mixing amount of chopped straw affects mechanical properties of black soil, in our study, two typical black soils with no tillage (high organic matter and low clay content) and with tillage for 40 years (low organic matter and high clay content) were chosen as subject samples. With the length of the chopped straw being 15 mm according to the pretrial results, compression-rebound and shearing behavior of black soil with different proportions of straw returning (0%, 25%, 50%, 75%, 100%) were determined by calculating and analyzing the compression index, rebound index, cohesion and internal friction with the methods of indoor oedometer test and triaxial test. Results showed that the mechanical properties of black soil improved after incorporation with straw, and soil with low organic matter content significantly responded to the change of straw mixing amount. The black soil showed the strongest resistance to compression and the strongest recovery capacity after compaction when the proportion of straw returning was 100%. However, shear strength of the black soil was greatest when the proportion of straw returning was 50%. In conclusion, black soil has a better potential to resist compression and erosion especially when the ratio of straw returning was 50%-100%.

LIN Lin, ZHANG Cheng-cheng, WANG En-heng. Mechanical properties of black soil after straw incorporation: Effect of straw mixing amount.[J]. Chinese Journal of Applied Ecology, 2017, 28(9): 2932-2938.

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