应用随机场理论进行可靠度分析时,关键在于随机场理论求得的参数,尤其是方差折减函数如何同可靠度理论结合起来。在土工可靠度计算中正确选取并且合理应用方差折减函数是一个非常关键但又很容易被忽略的问题。本文从随机场的基本理论出发,对这一问题进行探讨和研究,提出方差折减函数的确定原则;并通过一个工程算例,说明此折减原则较为合理,且在实际工程中偏于安全。
The key to application of random field theory to reliability analysis is how to combine the parameters obtained by the random theory, especially the combination of the reduction function of variance with the reliability theory, It is very important to correctly choose the reduction function of variance and to reasonably apply it to the reliability analysis. The problem often neglected by people was studied based on the random field theory and the principle for determination of reduction function of variance was presented. It was proved with an example that the principle is reasonable and reliable in the engineering practices.