期刊
MATERIALS
卷 15, 期 2, 页码 -出版社
MDPI
DOI: 10.3390/ma15020512
关键词
desulfurization ash; modified loess; shear strength; FLAC3D; numerical simulation
类别
资金
- Science Fundamental Research Projects of Shanxi Province [201901D111169, 201901D111133]
- Science and Technology Planning Project of Transport Department of Shanxi Province [2021-1-9]
This paper investigates the influence of desulfurization ash and fly ash on the strength of loess. The results show that both desulfurization ash and fly ash can improve the shear strength of loess, with desulfurization ash having a better effect. The simulation results are in good agreement with the experimental results, but the simulated shear strength is slightly higher than the test shear strength.
Desulfurization ash and fly ash are solid wastes discharged from boilers of power plants. Their utilization rate is low, especially desulfurization ash, most of which is stored. In order to realize their resource utilization, they are used to modify loess in this paper. Nine group compaction tests and 32 group direct shear tests are done in order to explore the influence law of desulfurization ash and fly ash on the strength of the loess. Meanwhile, FLAC3D software is used to numerically simulate the direct shear test, and the simulation results and the test results are compared and analyzed. The results show that, with the increase of desulfurization ash's amount, the shear strength of the modified loess increases first and then decreases. The loess modified by the fly ash has the same law with that of the desulfurization ash. The best mass ratio of modified loess is 80:20. When the mass ratio is 80:20, the shear strength of loess modified by the desulfurization ash is 12.74% higher than that of the pure loess on average and the shear strength of loess modified by fly ash is 3.59% higher than that of the pure loess on average. The effect of the desulfurization ash on modifying the loess is better than that of the fly ash. When the mass ratio is 80:20, the shear strength of loess modified by the desulfurization ash is 9.15% higher than that of the fly ash on average. Comparing the results of the simulation calculation with the actual test results, the increase rate of the shear stress of the FLAC3D simulation is larger than that of the actual test, and the simulated shear strength is about 8.21% higher than the test shear strength.
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