工程地质勘察中断层的活动性研究  

Study on Fault Activity in Engineering Geological Survey

作　　者：邱建强 Qiu Jianqiang(Brigade North China Geological Exploration Bureau,Chende 067000,Hebei,China)

机构地区：[1]华北地质勘查局五一四地质大队,河北承德067000

出　　处：《岩土工程技术》2021年第1期56-59,共4页Geotechnical Engineering Technique

摘　　要：断层是导致地质灾害的重要因素之一,为保证工程项目的安全,正确判定断层的活动性是避免地质灾害的必要手段。拟建布袋沟尾矿库库区内存在一条NW走向断层,以该断层为例,通过地表调查、地球物理探测(高密度电法、电测深)、工程钻探、槽探等多种手段对目标断层进行调查研究,查明该断层为正断层,NW向延伸,长1.55 km,宽1.5~2.5 m,产状NE 70°∠72°,控制深度420 m,断层规模为一条小型断层,第四纪以来未有明显活动迹象,为非全新世活动断层。断层工程稳定性较好,对工程建设无大影响。但考虑断裂构造角砾存在,虽然已经固结,但相对围岩较容易风化,成为一定的松散层,可能形成地下水下渗通道,建议工程建设时予以关注。Fault is one of the important factors leading to geological disasters.In order to ensure the safety of engineering projects,it is necessary to determine the activity of fault to avoid geological disasters.There is a NW fault located within the proposed Budaigou Tailing Reservoir area.Taking the fault as an example,the fault in the proposed reservoir area is investigated through methods such as geological survey,geophysical exploration(high density resistivity and electrical sounding),drilling and trench excavation.The fault is 1.55 km long and 1.5~2.5 km wide normal fault,northwest extending.The occurrence is 70°∠72°,and control depth being 420 m.The fault is a small non-holocene active fault with no obvious activity since Quaternary.The stability of fault engineering is good,which has no influence on engineering construction.However,considering the existence of fault structure breccia,although it has been consolidated,it is easy to be weathered relative to the surrounding rock,forming a certain loose layer,which may cause groundwater infiltration channel.So it is recommended to pay attention to it in engineering construction.

关 键 词：工程地质勘察 断层 钻探 槽探 活动性研究 

分 类 号：P642[天文地球—工程地质学]