用反分析方法研究堆石坝坝料的长期强度

通过对鲁布革心墙堆石坝运行期竖直变形观测资料的分析，建立大坝观测变形量与环境量之间的数学模型，分离出坝体变形的蠕变分量。对邓肯－张Ｅ－Ｂ模型中的参数ｋ，ｋ_ｂ，ｎ，ｍ，Ｒ_ｆ，■_０进行不同的组合，运用有限单元法将沉降计算值与实测值（扣除蠕变分量后）拟合，从而反演出坝料在不同时期的参数，认识到坝体在长期运行中由于坝料变得不断密实而使其长期强度随时间增长的规律

STUDY OF LONG-AGE STRENGTH OF ROCKFILL DAM MATERIAL

A statistic model is established based on the prototype observation of Lubuge Dam during its operation. The main nonlinear parameters for the Ducan-Chang E-B model of the dam material for different periods are obtained by comparison of the deformation. calculated with FEM for a series of different combinations of the parameters in the E-B model. with the observed deformation (in which the creep deformation is disconnected). The result shows that the long-age strength of the dam material increases because its compaction rate is increased during operation. and in the end. the strength parameter will be stable.