大坝渗流反问题初步研究

对大坝渗流反问题进行了初步研究,基于渗流场的有限元计算建立了反演坝体渗流参数的计算方法.该方法将参数反演问题转化为参数优化问题,利用大坝运行水位变化过程中坝体内某些测点上的水头测量数据,用牛顿-拉夫逊算法优化出坝体的渗流参数.通过算例计算分析表明,该反演方法具有推导简洁、反演精度高、适应性好的优点,有较好的工程实用价值.

A study of inverse problem for dam seepage flow

Inverse problem of dam seepage flow is studied in this paper. By using Finite Element Method(FEM) to solve the differential equations of unsteady seepage flow, a seepage parameter estimation algorithm is put forward. In this algorithm, the inverse problem is transformed to a parameter optimization problem. The measurement data of varying water head history on some spots due to water level change are employed to optimize the seepage parameter with Newton-Raphson scheme. Based on this algorithm, a typical example is investigated, i.e., calculated water head histories of six points in a dam are used as measurement data to identify the permeable coefficient and the specific yield of the dam. The results are satisfied even when measurement noise is simulated in the water head history. So, it can be drawn that the present inversion algorithm is not only convenient to use, but also of high accuracy and robustness, and it may be used in engineering practice.