According to expansive soil slope of Mombasa west station in Kenya Mombasa-Nairobi railway, the artificial simulated rainfall infiltration tests for slope were carried out, the change law of moisture capacity, matric suction and normal deformation was studied,and the inhibitory effect of grouted rubble on rainwater infiltration was analyzed. The results show that the soil moisture capacity and saturation caused by rainfall infiltration increases and the matric suction decreases,which reduces the shear strength of the slope,there are smaller volume contraction of expansive soil in early rainfall, the moisture capacity in the soil increases and the swelling deformation of the soil appears as the rainfall continues,and the protective effect of grouted rubble on expansive soil slope is remarkable, which could be applied in protection of expansive soil slope in Africa.%针对肯尼亚蒙内(蒙巴萨—内罗毕)铁路蒙巴萨西站膨胀土边坡开展边坡人工模拟降雨入渗试验,研究含水率、基质吸力和法向变形的变化规律,并分析了浆砌片石对雨水入渗的抑制效果.结果表明:降雨入渗引起土体含水率和饱和度上升,基质吸力下降,从而降低了边坡的抗剪强度;降雨初期,膨胀土出现较小的体积收缩;随着降雨时间的持续,土中含水率升高,土体出现了膨胀变形;浆砌片石对膨胀土边坡的防护效果显著,可用于非洲地区膨胀土边坡的防护.
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