中文摘要：

以广西膨胀土为研究对象，考虑气象因素的影响，通过现场试验对膨胀土的胀缩变形、变形模量与渗透特性进行了原位跟踪测试。结果表明，较小的降雨量就可以使表层土体的含水率和膨胀状态达到极限。对降雨过程而言，自然状态下膨胀土雨水入渗的影响深度是有限的；膨胀土变形模量随含水率的增加以幂函数的形式逐渐降低；当含水率较低、裂隙较发育时，土体的渗透性会大大提高，而植被的存在也会较大幅度地改善土体渗透性，为深入认识膨胀土边坡的灾变机制提供了依据。

英文摘要：

The swelling-shrinking deformation, deformation modulus and permeability of expansive soil are tracked and measured in Nanning, Guangxi considering the effect of atmosphere. The test results are just as follows. Firstly, a low rainfall may lead water content and swelling state to the limit value, and the influence depth of infiltration is finite while raining. Secondly, the deformation modulus is decreased with the increase of water content following the forms of power function. Finally, when the water content is low, the fissure is developed and the permeability is improved greatly; meanwhile, the permeability is also strengthened with the vegetation covered, which is useful to recognize the disastrous mechanism of exoansive soil slope.