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边坡变形中，氡（Ｒｎ）在地应力作用下不断向外迁移，并有如下规律：１．滑体内外及其不同部位氡（Ｒｎ）浓度平面分布有明显差异；２．滑体垂直剖面上氡（Ｒｎ）浓度分布集中在滑带附近；３．滑坡临滑前氡（Ｒｎ）浓度剧增。利用上述规律对滑坡预报问题进行了研究探讨。
In slope deformation, radon (Rn) continuously migrates outward under the action of ground stress, and has the following rules: 1. The distribution of radon (Rn) concentration inside and outside the slide and its different parts have obvious differences; 2. The concentration distribution of radon (Rn) in the vertical section of the slide is concentrated near the slide zone; 3. Radon (Rn) concentration increased sharply before landslide. Landslide forecasting problems are studied by using the above rules.