粉煤灰水泥土变形特性实验研究

水泥土中掺入粉煤灰能在一定程度改善其性能,而变形特性是实际工程应用的重要指标。因此,研究粉煤灰和龄期对水泥土变形特性的影响对实际工程具有较大的参考价值。通过粉煤灰掺量为0和8%的水泥土无侧限抗压强度实验,研究发现养护龄期的增长与粉煤灰的掺加有利于水泥土变形模量的增长,尤其是粉煤灰的掺加有利于后期变形模量的增长。进一步对比分析两种粉煤灰掺量时的无侧限抗压强度和平均变形模量,发现它们之间基本上呈线性关系,随后通过拟合得出了它们之间的换算公式。最后,考虑应力-应变曲线模型特征以及对试验数据回归分析,推导出了一定条件下的水泥土应力-应变上升段表达式,为实际工程设计提供参考。

EXPERIMENTAL STUDY OF DEFORMATION CHARACTERISTICS OF FLY ASH CEMENT-SOIL

The incorporation of fly ash into cement-soil can improve its performance in a certain extent. The deformation characteristic is an important index of actual engineering applications. Therefore, researching the effects of fly ash and ages on deformation characteristics of cemente-soil has a great reference value to actual engineering applications. The unconfined compressive strength test of 0 and 8%fly ash cement-soil is done. The experiments show that the growth of the curing age and the addition of fly ash are beneficial to the growth of cement-soil deformation modulus. Especially, the addition of fly ash is beneficial to the growth of the late deformation modulus. By further analyzing the unconfined compressive strength and the average deformation modulus of 0 and 8% fly ash cement-soil specimen, it is found that there is a basically linear relationship between them. Then the conversion formula is derived between them by fitting. Finally, considering the characteristics of stress-strain curve model and regression analysis on the test data, the expression of stress-strain of cement-soil on ascent stage is deduced under the definite condition. The results provide the reference for actual engineering designs.