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本组在讨论中绝大多数代表同意要点报告中选择三斗坪作为三峡坝址的意见,认为目前已有足够的资料可以肯定三斗坪坝址而否定南津关坝址。首先,在工程地质水文地质方面,三斗坪坝址位于坚硬的火成岩区,主要工程地质问题是风化壳和破碎带问题。而根据大量的勘探资料证明,在选定的坝址区内,风化壳一般约二、三十公尺,不算太厚,并且(?)有发现深厚的风化囊。破碎带一般胶结较好,倾角很陡(60°～80°),对坝的沉陷影响较小,因而也比较容易处理。而南津关坝区则位于石灰岩区,完整而坚硬的石灰岩虽然也可以作为大坝的基础,但南津关坝区有严重的喀斯特和构造问题。坝区内广泛分布着喀斯特溶洞及裂隙,在很深的地层里还大量存在,而且很多地下溶洞及喀斯特
Most of the representatives in the discussion agreed to choose Sandouping as the site of the Three Gorges Dam and agreed that there is enough information to confirm the dam site at Sandouping and to negate the dam site at Nanjin. First of all, in terms of engineering geology and hydrogeology, the Sandouping dam site is located in a hard igneous rock area, and the major engineering geological problems are weathering crusts and crushing zones. According to a large number of exploration data, weathering crusts are generally about 2 to 30 meters in selected dam sites, not too thick, and (?) There are deep weathering capsules found. Broken zone generally good cementation, very steep angle (60 ° ~ 80 °), the dam settlement less affected, and therefore easier to deal with. However, the Nanjin Guanba Dam is located in the limestone area. Although intact and hard limestone can also serve as the foundation of the dam, there are serious karst and structural problems in the Nanjin dam area. Karst caves and fissures are widely distributed in the dam area, and are also abundant in deep strata, and many underground karst caves and karsts