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地球学报  2006 

三峡水库引水工程秦巴段工程地质条件研究

DOI: 10.3975/cagsb.2006.05.11

Keywords: 三峡引水工程,工程地质条件,深埋隧道,岩爆,突水

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Abstract:

在系统调查研究三峡引水工程秦—巴段区域地壳稳定性、活动断裂、工程地质条件和重大工程地质问题的基础上,根据三峡引水工程秦巴地区的工程地质条件及其差异性,初步将其分为六个工程地质区段,即:Ⅰ—四川盆地沉积岩区、Ⅱ—大巴山南麓弧形断褶区、Ⅲ—大巴山断裂较密集的岩溶发育区、Ⅳ—南秦岭断裂较少发育的中轻变质岩区、Ⅴ—秦岭造山带断裂密集发育的高变质岩区、Ⅵ—渭河盆地第四系堆积区。总体评价:Ⅰ和Ⅵ段工程地质条件较好,Ⅲ和Ⅴ段条件较差,重大工程地质问题较多。其中,主要的工程地质问题是岩爆、大变形和突水,特别是秦岭主峰附近可能发生强岩爆、大巴山区可能引发大规模岩溶突水值得高度重视。从区域地质环境、地壳稳定性、线路工程地质条件和主要工程地质问题等因素综合分析3条比选线路的差异,初步认为秦巴段三条输水线路以中线相对较好。

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