School of Civil Engineering and Architecture, Hubei University of Technology, Wuhan, People's Republic of China.
Environ Technol. 2021 Mar;42(7):1071-1083. doi: 10.1080/09593330.2019.1652697. Epub 2019 Aug 27.
Mechanical properties of fiber-reinforced soil after soaking in heavy metal ion solution have great influences on safety and stability of the reinforcement, herein the mechanical properties of optimum moisture content of different concentrations of zinc ions contaminated soil were studied through shear test, compression test and triaxial test. The compressive modulus, compression coefficient and porosity ratio of different concentrations of the zinc-ion contaminated soil under different pressure were studied, and the variation characteristics of internal friction angle and cohesion were also investigated, thereafter, the causes of the change of cohesion and internal friction angle were analyzed from the microscopic perspective. The results show that the shear strength of contaminated reinforced soil increases with the increase of confining pressure at the same zinc ions concentration. And at the same confining pressure, with the increase of zinc ions concentration, the shear strength of contaminated reinforced soil first increases and then decreases. With the increase of zinc ions concentration, the internal friction angle and compression coefficient increase, the cohesion and the modulus of compression decrease. With the increase of normal stress, the compression coefficient decreases firstly and then increases, and the compression modulus increases and then decreases. With the concentration of zinc ions increases at lower normal stress, the amount of shrinkage increases and the compression coefficient decreases. While at higher normal stress, the compressive modulus decreases and the compression coefficient increases.
重金属离子溶液浸泡后纤维增强土的力学性能对增强体的安全性和稳定性有很大影响，为此通过直剪试验、压缩试验和三轴试验研究了不同浓度锌离子污染土最优含水率的力学性能。研究了不同压力下不同浓度锌离子污染土的压缩模量、压缩系数和孔隙比，并探讨了内摩擦角和黏聚力的变化特征，然后从微观角度分析了黏聚力和内摩擦角变化的原因。结果表明，在相同锌离子浓度下，污染增强土的抗剪强度随围压的增加而增加。在相同围压下，随着锌离子浓度的增加，污染增强土的抗剪强度先增大后减小。随着锌离子浓度的增加，内摩擦角和压缩系数增大，黏聚力和压缩模量减小。随着正应力的增加，压缩系数先减小后增大，压缩模量先增大后减小。随着较低正应力下锌离子浓度的增加，收缩量增加，压缩系数减小。而在较高正应力下，压缩模量减小，压缩系数增大。
