澜沧江某水电站泄洪洞出口边坡稳定性评价

Evaluation on slope stability of a hydroelectric station spillway,Lancang River

岩土质边坡是一种自然地质体,其稳定性在很大程度上具有不确定性、模糊性。模糊分析是边坡稳定性分析的有效途径之一。文章采用模糊数学分析法,构建了二次模糊综合评判模型,对影响边坡稳定性的诸多因素进行了分类归纳,并根据不同的稳定状态,将边坡划分为5个等级,再结合某水电站右岸泄洪洞出口开挖边坡稳定性的实际问题,利用梯形函数构建了与该边坡稳定性分析相关因素的隶属函数、运用专家评分法确定了各因素的权重,最终对该边坡的稳定性进行了评价。结果表明该评价分析结果与实际相吻合,评价效果较好。

As natural geologic body,the stability of rock and soil slope is uncertain and fuzzy to a large extent. It is one of effective methods to analyze its stability by fuzzy analysis. A fuzzy comprehensive analysis model is obtained based on the relationship of fuzzy equivalency, according to thedifferent stability states, the common slopes are devided into five kinds. Two-stage fuzzy comprehensive evaluation method is applied to evaluate on the Iarge-scale slope stability of a hydroelectric station according to the grade of its evaluation indexes. The authors construct a subordination function in relation to the stability analysis by trapezoidal function, and define different weights of every factor by means of expertise. Finally, this paper analyzes the stability of the slope. It can be seen that the results of analysis are in good coincidence with the truth.