石灰粉煤灰稳定黄土的无侧限抗压强度研究

Study on unconfined compressive strength of lime-fly ash stabilized loess

以石灰粉煤灰稳定黄土为对象,通过标准击实试验、无侧限抗压强度试验,研究养护龄期和石灰粉煤灰掺量对稳定黄土最佳含水率、最大干密度及无侧限抗压强度的影响。结果表明,随石灰粉煤灰掺量的增加,稳定黄土最佳含水率增大,最大干密度减小;石灰粉煤灰掺量一定时,随粉煤灰掺量的增加,最大干密度增大,最佳含水率减小;无侧限抗压强度随养护龄期的增长、石灰粉煤灰掺量的增加而增大。通过对试验数据的拟合回归,建立了稳定黄土无侧限抗压强度与孔隙率、粉煤灰与石灰的比值(F/L)及石灰粉煤灰总体积掺量的关系。

Taking lime-fly ash stabilized loess as the object,through standard compaction test and unconfined compressive strength test,the effects of curing age and lime-fly ash content on the optimal moisture content,maximum dry density and unconfined compressive strength of stabilized loess are studied.The results show that the optimum moisture content of stable loess increases and the maximum dry density decreases with the increase of lime and fly ash content.When the content of lime and fly ash is fixed,the maximum dry density increases and the optimum moisture content decreases with the increase of fly ash content.The unconfined compressive strength increases with the increase of curing age and the content of lime and fly ash.Through the fitting regression of the test data,the relationships between unconfined compressive strength of stable loess and porosity,ratio of fly ash to lime(F/L)and total volume content of lime-fly ash are established.