But in view of the dam have a large number of columnar joint, it influences the rockmass structural and quality classification of the dam area, which is one major problem of the dam .
但坝区玄武岩柱状节理发育，对坝区岩体结构和质量分级有重要的控制作用，为白鹤滩拱坝建设的主要工程地质问题之一。
参考来源 - 金沙江白鹤滩水电站柱状节理玄武岩岩体结构及质量分级研究·2,447,543篇论文数据，部分数据来源于NoteExpress
Columnar joint blocks are formed by two sets of joints.
“长柱状”节理块是由两组节理组成。
Columnar joint structure, as considered by various researchers long since, is only possible to develop in basic lava with low viscosity and high nuidity.
柱状节理构造历来被众多学者认为只能发育在粘度小、流动性大的基性熔岩中。
Columnar joint, microfissure and gently dipping structural surface are the three fundamental factors which lead to the small deformation modulus of basaltic mass.
白鹤滩柱状节理玄武岩中发育的柱状节理、微裂隙及缓倾角结构面是导致岩体变形模量较低的主要因素；
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