Wang Wei, Lv Beifeng, Zhang Chen, Li Na, Pu Shaoyun
School of Civil Engineering, Shaoxing University, Shaoxing 312000, China.
Department of Civil & Environmental Engineering, National University of Singapore, Singapore 117576, Singapore.
Polymers (Basel). 2022 Jul 19;14(14):2921. doi: 10.3390/polym14142921.
To improve the limitations of lime-treated subgrade soil (LS), a series of unconsolidated and undrained triaxial tests were conducted to investigate the improvement effect of fiber modified lime-treated soil (PLS) and fly ash modified lime-treated soil (FLS). The test results showed that (1) The deviatoric stress-strain curves of LS, PLS, and FLS were basically of the softening type. (2) The addition of fiber and fly ash improved the ductility and stiffness of LS. The ductility of PLS increased by 134% compared with LS, while the mechanical strength of FLS increased by 53%. (3) The microscopic tests showed that a denser skeleton structure was generated inside LS with the addition of fiber and fly ash. (4) The deviatoric stress-strain curves of LS, PLS, and FLS under different confining pressures were better characterized with the CES curve model. The above results indicate that fiber and fly ash can effectively improve the mechanical characteristics of lime-treated subgrade soil.
为改善石灰处理路基土（LS）的局限性，进行了一系列不固结不排水三轴试验，以研究纤维改良石灰处理土（PLS）和粉煤灰改良石灰处理土（FLS）的改良效果。试验结果表明：（1）LS、PLS和FLS的偏应力-应变曲线基本为软化型。（2）纤维和粉煤灰的加入改善了LS的延性和刚度。PLS的延性比LS提高了134%，而FLS的力学强度提高了53%。（3）微观试验表明，纤维和粉煤灰的加入使LS内部产生了更致密的骨架结构。（4）采用CES曲线模型能更好地描述不同围压下LS、PLS和FLS的偏应力-应变曲线。上述结果表明，纤维和粉煤灰能有效改善石灰处理路基土的力学特性。
