花岗岩残积土力学性能改良试验研究

Experimental Study on Improvement of Engineering Mechanical Properties of Granite Residual Soil

利用石灰和粉煤灰对花岗岩残积土进行改良,并提出单掺石灰、单掺粉煤灰以及复掺石灰+粉煤灰三种改良方式,对比分析了击实性能、抗剪性能、抗渗性能以及水稳定性能,结果表明:石灰和粉煤灰均能有效改善花岗岩残积土的力学性能,石灰对花岗岩残积土击实性能、抗剪性能和水稳定性能的提升较为显著,而粉煤灰对花岗岩残积土抗渗性能的改善效果较佳;当使用石灰+粉煤灰复掺改良花岗岩残积土时,改良土的各项力学性能有更进一步的提升,当采用粉煤灰:石灰:残积土=2:1:7的配比进行改良时,改良土的力学性能最佳。

Lime and fly ash are used to improve granite residual soil,and three improvement methods are proposed,including single lime,single fly ash and compound lime and fly ash. The compaction performance,shear resistance,impermeability and water stability are compared and analyzed. The results show that stone ash and fly ash can effectively improve the mechanical properties of granite residual soil,and lime can effectively improve the mechanical properties of granite residual soil,the improvement of compaction performance,shear resistance and water stability performance is more significant,while fly ash has a better effect on improving the impermeability of granite residual soil;when lime and fly ash are used to improve granite residual soil,the engineering mechanical properties of the improved soil are further improved. When the ratio of fly ash ∶ lime ∶ residual soil = 2 ∶ 1 ∶ 7 is adopted for improvement,the engineering of improved soil is improved,and the mechanical properties are the best.