不同权重条件下降雨对边坡稳定性影响的二级模糊综合评判

J4 ›› 2012, Vol. 42 ›› Issue (3): 777-784.

不同权重条件下降雨对边坡稳定性影响的二级模糊综合评判

沈世伟|佴磊|徐燕

吉林大学建设工程学院|长春130026

收稿日期:2011-09-02 出版日期:2012-05-26 发布日期:2012-05-26
作者简介:沈世伟(1982-)|男|讲师|博士|主要从事岩土工程及工程地质方面的教学与研究|E-mail:ssw2580@163.com
基金资助:
交通部科研项目（2007-353-322-080）；吉林省交通厅科研项目（2006-4-13）；吉林大学基本科研业务费项目（450060441080）

Two-Stage Fuzzy Comprehensive Evaluation for Rainfall Influence on Slope Stability Under Different Weight Value

SHEN Shi-wei, NAI Lei, XU Yan

College of Construction Engineering|Jilin University|Changchun 130026|China

Received:2011-09-02 Online:2012-05-26 Published:2012-05-26

摘要/Abstract

摘要：

边坡稳定性影响因素众多，其中一部分具有明显的不确定性，用经典数学理论及力学模型很难描述。采用二级模糊综合评判法，对影响边坡稳定的离散型和连续型因素采用不同方法确定隶属度，并利用二元对比分析法给出各因素权重值；同时考虑降雨对边坡稳定的重要影响，对降雨后各影响因素的权重进行修正，建立边坡稳定的二级模糊综合评判计算模型，评价降雨前后边坡稳定性的变化。研究结果表明：模型所采用的隶属函数，充分考虑了各个因素的不同特点和分布规律；考虑降雨前后权重的变化，能使评判结果更趋合理。以实际工程为例，模糊综合评判结果显示：降雨前边坡处于基本稳定状态，降雨后处于欠稳定状态，与经典极限平衡法计算结果一致。

关键词: 边坡稳定性, 降雨, 隶属函数, 权重修正, 模糊综合评判

Abstract:

Slope stability is influenced by numerous of factors, some of which are uncertain in order that they are difficult to be characterized by means of classical mathematical theories and mechanical models. Two-stage fuzzy comprehensive evaluation method is adopted. Different methods are utilized to obtain the membership degrees of discrete and continuous factors which influence the slope stability. The weight values of each factor are afforded by meands of comparative analysis of binary. Besides, the significant impact of rainfall should be taken into account. The weight values of each factor after rain are modified and a calculation model of two-stage fuzzy comprehensive evaluation is put forward in terms of slope stability. The different characteristics and the regularity of distributions are fully considered in membership functions. Considering the changes of weight values before and after rain increasingly rationalizes the evaluation results. In the concrete project, The method of fuzzy comprehensive evaluation is applied in an example and the results have a good agreement with classical limit equilibrium method, which the slope is stable before rainfall while it is less stable after rainfall.

Key words: slope stability, rainfall, membership function, weight of the amendment, fuzzy comprehensive evaluation

中图分类号:

P642.2

沈世伟, 佴磊, 徐燕. 不同权重条件下降雨对边坡稳定性影响的二级模糊综合评判[J]. J4, 2012, 42(3): 777-784.

SHEN Shi-wei, NAI Lei, XU Yan. Two-Stage Fuzzy Comprehensive Evaluation for Rainfall Influence on Slope Stability Under Different Weight Value[J]. J4, 2012, 42(3): 777-784.

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