基于多目标可变模糊评价法的导流隧洞围岩稳定性分级研究

Study on Variable Fuzzy Evaluation for Stabilizing of Surrounding Rock in Diversion Tunnel

在分析隧洞围岩稳定性影响因素及各因素的重要性基础上,推导了基于可变模糊集理论的围岩稳定性级别划分的多目标可变模糊评价方法。以漫湾水电站#2导流隧洞围岩为例,先确定岩石质量指标、湿抗压强度、岩石完整性系数、结构面强度系数、地下水渗水量,再按现行规范要求将围岩划分五等级,取围岩样品标号1的指标特征值进行多目标可变模糊评价。计算结果表明,围岩稳定性等级为2-4级,与实际情况相符。与可拓扑评价方法相比,采用多目标可变模糊评价结果更为合理可信。

Through analyzing the influence factors of surrounding rock stability of tunnel and the importance of various factors, the multi-objective variable fuzzy evaluation method of the classification of surrounding rock stability based on variable fuzzy set theory is deduced. Taking surrounding rock of Manwan Hydropower Station # 2 diversion tunnel as an example,the following process is performed：determing rock quality designation（RQD）, wet compressive strength（RW）, rock integrity coefficient（kr）,coefficient of rock structure face strength（ki）,coefficient of groundwater seepage flow（W）. Then,the surrounding rock is divided into 5 classifications according to the current standard. The index feature value of rock sample # 1 is calculated by use of multiple-objective variable fuzzy evaluation method. The results show that the grade of surrounding rock stability is 2 to 4, with the actual situation. Compared with the extension evaluation method,the results are more reasonable by using multi-objective variable fuzzy evaluation.