【作者】 龙文；

【导师】 李宁； 孟繁业；

【作者基本信息】 西安理工大学 ， 建筑与土木工程， 2003， 硕士

【摘要】 本文结合黑河水利工程130m高心墙坝设计工作需要，对大坝进行了应力变形有限元数值仿真分析。采用二维数值仿真分析研究了心墙填土干容重、心墙坡比及厚度、施工工期等因素变化对坝体应力、变形、孔隙压力的影响程度：采用三维数值仿真分析研究了大坝在各种工况下的坝体应力变形状态，分析了材料流变性对应力变形的影响程度：利用施工期和竣工期原型观测数据初步对大坝做了反馈分析，确定了坝料的流变参数，再次进行了二维和三维数值仿真分析，并对两种结果进行了对比。研究成果可对今后的高土石坝设计提供有益的借鉴。 通过上述分析研究，表明黑河大坝在各工况下坝体具有较好的应力变形状态，不会出现横向裂缝、纵向裂缝及水力劈裂。研究表明对心墙土料填筑干容重分区采取下部高上部低方案是可行的；心墙坡比采用1：0.2是可行的，但应结合其它因素确定心墙坡比；施工工期对坝体应力变形及孔隙压力影响甚微，故可采取最短的施工工期27个月。材料的流变性对坝体变形影响很大，在数值分析中应计入这种影响。对大坝利用原型观测数据进行反馈分析是必要的。对于狭窄河谷中的土石坝进行三维数值仿真分析比二维分析具有更大的优越性。更多还原

【Abstract】 The stress and deformation distribution of the HeiHe Project, 130m-high core-rockfill dam , is numerically investigated by FEM. Affect to stress , deformation and pore water pressure, which is caused by changing dry density of core material , gradient of core and thickness , construction period, is been researched by using 2-D FEM. The state of stress and deformation of dam under all kind of cases is researched by using 3-D FEM, and Affect of material’s creepage to stress and deformation is been researched yet. The parameter of material’s creepage is been confirmed through back analysis to dam by using data gained from in-site observation under construction and after construction, Analysis is been done again by using 2-D FEM and 3-D FEM, Compare between two results is been done. Results of research may provide reference for design of high earth and rockfill dam later.Research shows that Heihe dam has a good state of stress and deformation under all kind of cases, and transverse crack, longitudinal crack and hydraulic fracturing don’t appeal. Scheme that material’s dry density is been increased in lower of core and been minished in high of core may be taken. Gradient of core can take 1.0.2, but other factor must take into account to determine gradient of core. Affect to stress , deformation and pore water pressure causing by construction period is so poor that the shortest construction period can be tanken. Material’s creepage must been taken into account because it’s affect to deformation of dam is very great. To earth and rockfill dam in narrow gorge, analysis by using 3-D FEM has more advantage than by using 2-D FEM.更多还原