粉煤灰土工程特性试验研究

Experimental study on engineering characteristics of fly ash soil

为研究含水量对粉煤灰土特性的影响,采用试验分析的方法,得出了粉煤灰土(1:2)抗压强度随含水量增加平缓降低,含水量在15%～23.5%范围内的抗压强度都大于150kPa;粉煤灰土(1:2)在不同含水量下的破坏应变接近于5%;粉煤灰土(1:2)的变形模量随着含水量增加而降低;不同的含水量下灰土比为1:4、1:2和1:1的抗压强度都随着含水量的增加而减小,但灰土比为1:2时抗压强度均高于其他两种情况。利用无重复两因素方差分析了粉煤灰土特性的影响因素,得出含水量对粉煤灰土的抗压强度影响显著,含水量对粉煤灰土的变形模量影响显著,灰土比对粉煤灰土的抗压强度影响更显著。该成果为粉煤灰土在工程设计和应用提供理论依据。

Test on composite material of fly ash and silt clay was conducted in this study. The study found that the compressive strength of fly ash soil （1：2） slowly decreases with the increase of moisture content; the compressive strength is greater than 150MPa when the moisture content ranges from 15% to 23.5%; the failure strain of fly ash soil （1：2） closes to 5% with different moisture contents; the modulus of deformation of fly ash soil （1：2） decreases with the increase of moisture content; the compressive strength of the lime soil ratio （1：4）, （1：2）, （1：1） decreases with the increase of moisture content; however, when lime soil ratio is 1：2, the compressive strength is greater than others. Using the non-repeat two factors variance analysis method, the factors affecting the characteristics of fly ash soil were analyzed. It concluded that the moisture content has significant impact on the compressive strength and on the modulus of deformation of fly ash soil; the lime soil ratio has significant impact on the comoressive strength. The results provide a theoretical basis for using fly-ash soil in engineering work.