Badly weathered rock, limestone cavities, soft clay and other alluvium deposits are commonplace and make it increasingly difficult to know how to optimise successfully during design.

• 恶劣风化的岩石，石灰岩洞穴，松化的粘土和其他冲积层沉淀是非常的普遍，使其增加了成功优化设计的难度。