确定堤坝工程地基渗透系数的敏感分析法

Determination of Penetration Parameters of a Bank or Dam Foundation with Sensitivity Analyzing Method

堤坝工程中地基渗透系数的选取具较大随机性 ,为了解决这个问题 ,采用敏感性分析理论建立了求解渗透系数敏感性因子的数学模型 ,该模型在河南省燕山水库水利工程中的应用表明 :覆盖层渗透系数的敏感性最大 (>1 0 -2 ) ,设计应取试验值的大值 ;其他部分渗透系数的敏感性相对较小 (1 0 -6～ 1 0 -3 ) ,设计中可取试验值的均值 ;对于防渗设施 ,只要达到一定密实度 ,再降低其渗透系数 。

There appears to be random to design the penetration parameters for a bank or dam foundation. To solve this problem, this paper introduces a sensitivity analyzing method to calculate the penetration parameter's sensitivity factor of each part in the calculation model. The application of the method in Yanshan reservoir indicates that the covering layer's penetration parameter's sensitivity factor (>10^(-2)) is the biggest, whose design parameter should then be the biggest of the testing values. The sensitivity factors (10^(-6)-10^(-3)) of other parts are relatively small, whose design parameters can then be the mean values. As for the anti-penetration objects, if dense enough, the decrease of the penetration parameters will be insignificant.