摘要
本文提出了大坝变形观测点位移计算值与实测值的最佳结合准则,借助于有限元数值法与复合型优化求解法的耦合计算,将坝体及坝基材料参数的反演归结为数学上的极小值优化问题。进而得到逆问题的最优解。此法所用的数学及力学概念明确,可应用于各种线性及非线性的反演求解。本文所举二例均得到满意的解答,其中例2对某重力拱坝的18~#坝段的统计回归模型成功地进行了反分馈识别,评估及修正。
In the light of the criterion of the optimal fitting between the calculated deformations and those measured in situ and with the help of the intercomputation combining the FEM and the optimization method complex, the converse problem of material parameters is considered in this paper as a mathematical minimization problem. And then the optimal solution can be worked out. The conceptions of the method are clear and definite in respect of mathematics and mechanics. This back analysis procedure is suitable for the evaluation and analysis of other linear and nonlinear conversion problems in dam and geomechanical structures. Satisfactory reasonable solutions have been obtained to the two examples illustrated in the paper. In the second example, with the feedback analysis thc statistical displacement forecasting models has been successfully calibrated, evaluated and corrected for the horizontal water pressure components of the observation points in the dam measured with the direct and reversed pendulums. The statistical regression analysis is based on the sequences of 7 years' observed displacement data in prototype.
出处
《大坝观测与土工测试》
北大核心
1991年第1期17-23,共7页
Dam Observation and Geotechnical Tests
