雄安新区工程地质勘察标准钻孔技术控制及施工实践  

Technical control and drilling of standard geo-technical investigation boreholes in the Xiongan New Area

作　　者：李忠 和新[2] 李艳丽[2] 李晋锐[2] LI Zhong;HE Xin;LI Yanli;LI Jinrui(Hebei Bureau of Geology and Mineral Resources Exploration, Shijiazhuang Hebei 050081, China;Territorial Resources Exploration Center of Hebei Geo-mineral Bureau, Shijiazhuang Hebei 050081, China)

机构地区：[1]河北省地质矿产开发局,河北石家庄050081 [2]河北省地矿局国土资源勘查中心,河北石家庄050081

出　　处：《探矿工程（岩土钻掘工程）》2019年第5期8-12,共5页Exploration Engineering:Rock & Soil Drilling and Tunneling

基　　金：中国地质调查局地质调查项目“雄安新区水土质量与工程地质调查评价”(编号:DD20189122-W04)

摘　　要：雄安新区地质勘察大会战中200m标准勘察钻孔,地层层位交替变化大,局部夹软弱地层和砂土液化,砂类地层胶结性差、结构松散等,难以保证垂直度以及岩心采取率。施工中采用了合理钻具配置、优化钻进参数等综合措施,预防钻孔偏斜;同时在取心时采用松散地层干钻取心、岩心管内隔离措施、采用泥浆泵分流注浆退心等行之有效的技术措施,保证了钻孔质量,取得了非常明显的技术效果。In order to cope with the difficulty in maintaining the borehole verticality and core recovery due to great alternation of strata, liquefaction of soft strata and sand, poor cementation and loose structure of sand encountered in drilling of the standard 200 m geo-technical investigation boreholes in the Xiongan New Area, comprehensive measures such as proper configuration of the drilling string, optimization of drilling parameters have been adopted to prevent drilling deviation. At the same time, effective technical measures such as dry core drilling in loose strata, isolation in core barrels, diversion of the mud pump discharge for core ejection have been adopted to ensure the drilling quality, leading to very obvious technical results.

关 键 词：雄安新区 工程地质勘察 钻探 孔斜 岩心采取率 

分 类 号：P634[天文地球—地质矿产勘探]