On the basis of landslide investigation and a laboratory test, a FORTRAN calculation program is developed in this paper, which can comprehensively consider the special moisture absorption and softening characteristics of expansive soil. After rainfall, the strength of the weak interlayer and large fissures will be further reduced after moisture absorption, and the sliding surface is easily formed under the load of filler, which is the main factor inducing embankment landslide. There are many weak intercalations or large fissures under the ground, which are generally parallel to the trend, with low strength and high permeability. The expansive soil layer is heterogeneous. However, according to engineering experience, a landslide of fill embankment on expansive soil foundation is also very common. At present, the research on expansive soil slope mainly focuses on the newly excavated cutting slope. With the rapid development of road engineering today, a large number of high-grade highways need to pass through expansive soil distribution areas.
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