石屑水泥石灰复合改良膨胀土的无侧限抗压强度试验研究

以复合改良膨胀土的无侧限抗压强度为研究对象，在膨胀土中分别掺入水泥和石屑、石灰和石屑进行复合方法改良，并进行无侧限抗压强度试验，将试验结果与石屑改良膨胀土进行对比分析。结果表明:对膨胀土分别掺入水泥和石屑、石灰和石屑进行复合改良，无侧限抗压强度值均有大幅度的提升，且水泥和石屑复合改良方法的效果优于石灰和石屑复合改良方法。在膨胀土中掺入石屑，同样能有效提高膨胀土的无侧限抗压强度。通过复合改良方法与单一改良方法对比，在相同掺量条件下，复合改良方法的无侧限抗压强度试验值远大于单一改良方法。

Experimental Study on Unconfined Compressive Strength of Expansive Soil Compounded and Improved by Aggregate Chips,Cement and Lime

Based on the unconfined compressive strength of compound and improved expansive soil as the research object, the composite improvement methods with cement and aggregate chips, lime and aggregate chips respectively are applied to improve the expansive soil, the unconfined compressive strength tests are conducted, the test results of composite improvement methods are analyzed comparatively with that of aggregate chips-treated expansive soil respectively. The test results show that the unconfined compressive strength values are improved greatly while expansive soil is improved with cement and aggregate chips, lime and aggregate chips respectively, and the improved effect of composite improvement with cement and aggregate chips is better than that of lime and aggregate chips. In addition, aggregate chips can effectively improve the unconfined compressive strength of the modified expansive soil. Based on the comparative analysis with the composite improved method and aggregate chips-treated expansive soil method, the unconfined compressive strength values of composite modified methods are much larger than that of the aggregate chips-treated expansive soil method in the same content ratio of the improved materials.