某水电站特高重力坝坝基区域断裂工程地质分带性状研究  

Study on the Engineering Geological Zoning Properties with Regional Faults of a Hydropower Station Ultra-high Gravity Dam Foundation

作　　者：邓争荣 吴树良 李林 谢建波 曹道宁 康岩玲 

机构地区：[1]长江岩土工程总公司(武汉),湖北武汉430010 [2]河南省地质矿产勘查开发局第三地质矿产调查院,河南信阳464000

出　　处：《资源环境与工程》2017年第4期401-406,共6页Resources Environment & Engineering

摘　　要：某拟建水电站工程地区发育有May Kha断裂,系区域性断裂构造,不具活动性,穿越特高混凝土重力坝河床左侧及近岸坝基,其不同性质的构造活动形成的构造岩存在明显的差异,需从工程地质实际意义出发,将其进行工程地质分带。采用工程地质学结合构造地质学方法,对坝基部位构造带进行划分,为韧性粗糜棱岩带、脆性碎裂岩带及F_(41)、F_(42)断层软弱构造岩带;开展的工程性状研究结果表明:粗糜棱岩带、碎裂岩带微新状岩体强度、变形指标参数满足或基本满足大坝建基要求,可作为大坝建基岩体,且可容易利用;F_(41)、F_(42)断层软弱构造岩带宽度在2.1 m以内,强度、变形指标参数低,不能直接满足筑坝要求,须予以工程处理。A proposed hydropower project areas are developed by May Kha fracture, which are regional fault structure, non- active, high concrete gravity dam across the river on the left and coastal foundation, there are significant differences in tectonic rocks formed by tectonic activities of different properties. From the practical significance of engineering geolo-gy ,to carry out engineering geological zoning. Based on the engineering geology combined with the structural geology method,the dam foundation structure is divided into the ductile mullite zone,the brittle fracture zone and the Fqi and F42 fault weak structural rock belts. The results of the engineering traits show that the deformation index parameters of coarse mylon rock mass and micro-new rock mass meet or basically meet the requirements of dam foundation, can be used easily as dam rock foundation;F41,F42 fault weak tectonic zone width within 2. 1 m,strength,low deformation index parameters can’t directly meet the dam requirements,the project shall be processed.

关 键 词：工程地质分带 工程性状 区域断裂 重力坝坝基 水电站 

分 类 号：TV642[水利工程—水利水电工程]