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一、双面赤平极射投影法拱坝坝肩岩体稳定分析是拱坝设计中的一个重要问题。目前对三维空间四面岩体稳定分析,多采用全空间赤平极射投影法,但这个方法的赤平投影网面积过大,使用不便,且有精度不够高的缺点。常见的拱坝坝肩可能滑移体,是由三个相交的结构面和自然边坡面构成的四面体。在这三个相交的结构面中总是有一个缓倾角结构面。我们提出的双面赤平极射投影法(也称为两次赤平极射投影法),是把缓倾角结构面置平,另外两个较陡结构面也跟随
First, the double-sided stereographic polar projection method rock mass stability analysis of arch dam abutment is an important issue in arch dam design. At present, the stability analysis of four-sided rock mass in three-dimensional space uses the full-space stereoplanar polar projection method. However, the stereographic projection network of this method has a large area, is inconvenient to use, and has disadvantages of not being sufficiently accurate. Common arch dam abutments may be slip bodies, which are tetrahedrons consisting of three intersecting structural faces and natural slope faces. In these three intersecting structural planes there is always a gently dipping structure plane. The double-faced polar polar projection method we propose (also called twice-stere polar projection method) is to flatten the flat surface of the dip angle, and the other two steeper structures also follow.