改性贵州玄武岩残积土的抗压强度试验研究

Experimental Research on Compressive Strength of Modified Residual Soil of Basalt in Guizhou

为了使贵州玄武岩残积土合理用于路基,通过采用石灰、粉煤灰、水泥三种改性材料按不同含量对其进行单掺、双掺、正交试验研究,同时考虑未浸水与浸水两种状态,测其抗压强度,得出最佳配比。实验结果表明:①单掺试验,改性残积土的抗压强度随着改性材料含量的增加而逐渐增大。石灰处理的改性土浸水时在8%达到最大值,粉煤灰处理的在未浸水时在15%达到最大值,同时浸水的试样全部崩解。②双掺试验,抗压强度均是随着含量的增加而增大,且石灰∶粉煤灰=1∶1的抗压强度比石灰∶粉煤灰=1∶2的高。③正交掺试验,得出试样的最佳配比为石灰8%,粉煤灰8%,水泥2%,同时得出石灰对玄武岩残积土的抗压强度影响最大。石灰、粉煤灰、水泥三种材料处理玄武岩残积土,其抗压强度均有不同程度的增加,故考虑三种材料混合处理玄武岩残积土对以后路基填料提供参考。

In order to make residual soil of basalt in guizhou underlying for subgrade reasonably, according to the different content of lime, fly ash and cement on the mixed with a single, double, orthogonal. Measuring the compressive strength on considering not water and water to get a best proportion . Test results show that ： （ 1 ） The compressive strength of modified residual soil of basalt increase gradually with the increase of the content of modified materials with a single experiment. The modification treatment of lime soil reach a maximum 8% when is watered. Fly ash reach a maximum 15% when is not watered, at the same time, the watering sample are all crumbling. （2） The compressive strength increase all with the increase of the content with the double experiment, and the compressive strength of lime ： fly ash = I ： 1 is higher than lime ： fly ash = 1 ： 2. （3） The best proportion is for 8% lime, 8% fly ash, 2% ce- ment with the orthogonal experiment, and the lime is the biggest influence factors to the compressive strength of residual soil. Because the compression strength all has different increases with lime, fly ash, cement three kinds of materials processing basalt residual soil, so it is reference for subgrade with three kinds of materials mixed processing basalt residual soil.