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北京市门头沟区某公路岩质边坡数量多,边坡物理力学性质及其影响因素复杂多变,无法获取每个边坡岩体的物理力学参数,因此,对大量边坡进行力学稳定性分析十分困难。采用层次分析和模糊综合评价方法,根据各种因素对岩质边坡稳定性影响的定性分析,确定了2级4类共9个边坡稳定性影响因子,将边坡的稳定性级别划分为4级,即稳定、基本稳定、较不稳定和不稳定;然后,构建了隶属度矩阵和权重矩阵;最后,对每个边坡的稳定性进行模糊综合评价。分析结果表明,在所研究的113个边坡中,不稳定边坡3个,占总边坡的3%,较不稳定边坡27个,占24%,基本稳定边坡52个,占46%,稳定边坡31个,占27%。因此认为:当边坡数量众多、边界条件模糊、影响因素复杂时,模糊综合评判是比较合适的边坡稳定性分析方法;应用最大隶属度原则时,需根据各种因素对边坡稳定性影响的因果关系,对最大隶属度原则的有效性进行评估,以防出现评判失效。
There is a large number of rock slope in a highway in Mentougou District of Beijing. The physical and mechanical properties of the slope and its influencing factors are complex and changeable, so the physical and mechanical parameters of each slope rock mass can not be obtained. Therefore, the mechanical stability of a large number of slopes Very difficult. Based on the qualitative analysis of the influence of various factors on the stability of rock slope, the influencing factors of the stability of 9 sides in Grade 2 and 4 are determined by the method of AHP and fuzzy comprehensive evaluation. The stability of the slope is classified into Level 4, that is, stable, basically stable, less stable and unstable. Then, the membership matrix and weight matrix are constructed. Finally, the fuzzy comprehensive evaluation of the stability of each slope is carried out. The results show that of the 113 slopes studied, three are unstable, accounting for 3% of the total slope, 27 less stable slopes, accounting for 24% and 52 basically stable slopes accounting for 46 %, 31 stable slopes, accounting for 27%. Therefore, it is considered that fuzzy comprehensive evaluation is a suitable slope stability analysis method when there are many side slopes, the boundary conditions are fuzzy and the influencing factors are complex. When applying the principle of maximum degree of membership, the influence of various factors on the slope stability Of the causal relationship between the maximum membership degree of effectiveness of the principle of assessment to prevent the failure of judgments.