天然坡度 meaning in Chinese

depositional gradient
natural slope

There are two main innovate ideas in the dissertation . ( 1 ) supported by the results from the method of limit analysis of soil plasticity and the ultimate equity method , the author proposes the criterion of judging of stability of slope of foundation of a building
本文的创新点主要有：采用塑性极限分析和极限平衡方法，通过计算，提出了黄土地区宅基边坡的稳定性评价标准，即人工谷缘的坡度不得大于天然坡度。