水利水电工程实测变位资料的覆盖层徐变.pdfVIP

第32卷第5期 水 利 水 电科 技 进 展 2012年10月 Vol.32 No.5 Advances in Science and Technology of Water Resources Oct. 2012 DOI:10.3880/ j.issn.1006 7647.2012.05.013 基于水利水电工程实测变位资料的覆盖层徐变 刘世煌 (水利部水利水电规划设计总院,北京摇 100011) 摘要:通过几座建筑于深厚覆盖层上的水工建筑物持续发展的实测变位资料,分析深厚覆盖层的徐 变原因、徐变对工程安全的影响以及徐变的防治措施。 认为覆盖层徐变可能与其局部架空现象、软 弱颗粒的压碎充填及应力水平较高等因素有关;覆盖层徐变一般会逐步收敛,但若破坏了闸坝防渗 体系,导致地基渗流破坏,则会危及工程安全;发现覆盖层持续变形现象后,应结合地质资料、监测 资料及结构运行状态等进行全面分析,严格区分结构失稳与覆盖层徐变的界限,根据变形量大小、 发展趋势及对工程的危害程度有针对性地采取措施。 关键词:覆盖层徐变;实测变位资料;水利水电工程 + 中图分类号:TV698.1 1摇 摇 摇 文献标志码:A摇 摇 摇 文章编号:1006 7647(2012)05 0056 04 Creep of overburden layers based on observed deformation data of hydropower projects/ / LIU Shihuang (Water Resources and Hydropower Planning and Design General Institute,Ministry of WaterResources,Beijing 100011,China) Abstract:The causesfor creep of deep overburden layers,influences of creep on project safety andthe relevant measures are analyzed based on the observed data of continuous deformation of several hydraulic structures on deep overburden layers. It isconsideredthatthecreepof theoverburdenlayersmay relatetolocal overheadhollowness,crushingandfilling ofweakparticlesandhighstresslevel,etc. Itwillgraduallyconvergeandstabilize. However,iftheanti鄄seepagesystemfor embankments and dams is damaged,and foundation failure occurs due to seepage,the project safety will be threatened. Once continuous creep phenomenon of overburden layers is discovered,a thorough analysis should be carried out by using geological data,monitoring data and operating status of the existing structures. The structural instability and the creep of overburden layers should be severely distinguished. The relevant measures should be made according to magnitude of deformation,trend of devel