某水电站坝址区薄层碳酸盐岩溶蚀风化分带地质研究

Geological Research on Dissolved Weathering Zoning of Thin Layer Carbonate Rock in a Hydropower Station Dam Area

某水电站坝址建坝岩体是以薄层结晶灰岩、大理岩为主的碳酸盐岩,质不纯,裂隙等结构面发育程度总体上中等—较发育。受基础地质、岩体卸荷松弛作用等综合因素影响,其溶蚀风化与典型的层厚为中厚层以上纯碳酸盐岩相比,具有明显的差异,岩体溶蚀风化具有类似非可溶岩均匀风化由强到弱的垂直分带性,并表现出浅部岩体整体完整程度差,深部岩体完整程度好的特点。在研究本水电站坝址区薄层碳酸盐岩岩溶发育特征与规律、岩溶发育影响因素的基础上,开展溶蚀风化分带地质特征定性研究,并就各风化带对应的主要技术指标定量特征进行研究。此研究成果可供类似地区及类似工程参考。

The dam rock mass ol a hydropower station dam site is made ol thin layer crystalline limestone, marble - based carbonate rock, impurity,lracture and the degree ol structural plane development is generally moderate to moderate. Un-der the influence ol basic geology and rock mass unloading and relaxation, the dissolution weathering is obviously different Irom that ol pure carbonate rocks with typical thickness. Uniform weathering from strong to weak vertical zoning with sim-ilar non-soluble rock,and show the extent ol the shallow rock poor overall integrity,completeness good depth large rock. On the basis ol the law ol Karstdevelopment characteristics, regularity and lactors withthin layer carbonate rocks on the hydropower station dam site area, the qualitative study on the geologic characteristics ol the weathering zone is carried out,and the quantitative characteristics ol the main technical indexes corresponding to each weathering zone are studied. The research results are available lor similar areas and similar projects.