涉及的概率极限定理包括强大数律，收敛速度，依分布收敛和大偏差原理。
Probability limit theorems surveyed mainly involved strong laws of large Numbers, rates of convergence, convergence in distribution and large deviation principles.
引用无穷小概念，结合0 - 1律讨论了该模型的分布收敛于退化正态分布的条件。
The condition of this model converge to degenerate normal distribution is discussed by citing the idea of infinitesimal, combining with the law of 0-1.
计算实例表明，该方法求解效率高，结果的收敛性稳定，优化后的坝体应力分布更趋于均匀。
The result of an engineering example shows that solution is effective and convergence is stable, and stress distribution of dam body tends to uniformity after optimization.
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