Abstract:For the uncertain factors of expansive soil,the characteristics and regularities of expansive soil slope should be known clearly before its design and treatment,so that the pertinent measures can be taken according to the similar slopes. Based on the tests of cutting slope,analyses of the expansive soil features and the reasons that the three expansive soil slopes fail,slope cutting method,anti-slide piles,anchors and retaining walls are adopted separately;and the stability analysis under the four conditions are also analyzed. On the premise that the slope is stable,the merits and disadvantages of these methods are judged separately from the views of economy and environmental protection. For slopes lower than 12 m,the cutting method should be adopted for reasons of economy and environment. In the procedure of detail design,the in-situ conditions,ecological aspects and the costs should also be considered.