土钉结构稳定验算的经验遗传–单纯形算法

针对基坑开挖的土钉支护问题,提出将经验遗传–单纯形算法应用于支护结构的稳定性验算,并与一般遗传算法的结果进行了比较。比较结果表明:本文建议的方法更有效和准确。文中还对一个具体的工程实例使用本文建议的方法进行了验算分析,并与商业软件的分析结果做了比较。结果表明:该商业软件未能搜索到最危险滑裂面,其结果对稳定性评价是偏于不安全的。此外,在土钉支护的稳定性验算过程中,一些优化程序在求解安全系数时将土层看作或是转化为均质土,而本文方法考虑了土体的分层。

Interior stablility analysis method of soil-nailed structure based on empirical genetic-simplex algorithm

Based on empirical genetic-simplex algorithm(EGSA),an analytical method of the interior stability of soil-nailed structure for deep foundation pits was proposed.Compared with genetic algorithm(GA),it was shown that EGSA was better than GA.The calculation of the integral stability of a practical engineering example was carried out by using the proposed method and commercial software respectively.It was shown that the most dangerous sliding-plane could not be found out and its evaluation on stability was unsafe by using the commercial software.Furthermore,during calculating the interior stability of soil-nailed structure,the soil deposit was commonly regarded as homogeneous.In this paper,the stratified character of soil deposit was considered.