我省处于西北高原，黄河两岸，地形变化很大。为确保工程质量，特别是建筑物基础的质量，在建筑工程中普遍采用钻孔灌注桩这一新的施工方法。这种方法具承载力高、经济、施工简便、速度快等优势。但钻孔灌注桩也存在一些缺陷，这些缺陷造成桩的承载力下降。现就这一问题进行分 My province is located in the northwest plateau, the Yellow River, the terrain changes greatly. In order to ensure the quality of the project, especially the quality of the foundation of the building, the new construction method of bored piles is widely used in construction. This method has the advantages of high bearing capacity, economy, simple construction and high speed. But there are also some defects of bored piles, these defects cause the pile bearing capacity to drop. Now on this issue points