石灰-EPS颗粒复合改良膨胀土的膨胀性研究

Study on the Expansion of Lime-EPS Particles Composite Modified Expansive Soil

以河南省南阳市某基坑的膨胀土为改良对象,在最佳石灰掺量和最佳掺水量下,将EPS颗粒按0、5%、15%、30%、50%等5个体积分数掺入膨胀土中,基于有荷载膨胀率试验和膨胀力试验,探究EPS颗粒添加量对复合改良土膨胀性的影响规律。结果表明,复合改良土的膨胀力和有荷载膨胀率随EPS颗粒添加量的增加呈递减趋势;EPS颗粒添加量为5%时,改良效率A和改良效率B均最大。

Taking the expansive soil of a foundation pit in Nanyang City,Henan Province as the improvement object,the EPS particles are added into the expansive soil in five volume fractions of 0,5%,15%,30%and 50%under the optimal lime content and water content,and the influence law of EPS particle content on the expansion of composite improved soil is explored based on the loaded expansion rate tests and expansion force tests.The results show that the expansion force and loaded expansion rate of composite improved soil decrease with the increase of EPS particle content,and when the addition amount of EPS particles is 5%,both the improvement efficiency A and B are the largest.