基于组合权重的模糊物元模型在砂土液化势评价中的应用

Application of fuzzy matter-element model based on coefficients of combined weights in evaluation of sand liquefaction

目前,砂土液化问题仍是岩土工程界重要的研究方向。鉴于砂土液化评价的复杂性及其影响因素的不确定性和模糊性,将熵值理论与模糊集和贴近度相结合,建立了基于熵权与专家打分法所获权重的组合权重的模糊物元模型,有效地避免了权重分配困难的问题。该模型以一种新的方法进行砂土液化势的评价,并且结合实例应用,通过与现场标贯试验对比,进一步验证了该模型的合理、简便和实用。

The problem of sand liquefaction is still an important research direction for geotechnical engineering at present. Because of the complexity, uncertainty and the fuzziness of the effective factors for evaluating sand liquefaction, the entropy value theory is applied to combination with fuzzy matter-element and approach degree for establishing a fuzzy matter-element model based on coefficients of weights that combine with an entropy weight and a weight attained by Delphi. The problem of weight allocation can be avoided by employing the method suggested in this paper. The calculation result for an example is compared with the standard perforation test （SPT）. The results indicate that the proposed method is reasonable and practical.