基于模糊RES-云模型的坝基岩体可灌性评价研究

岩体可灌性分析与评价是大坝基岩灌浆的重点和难点,科学合理的可灌性评价对保证灌浆效果具有重要理论与工程意义。目前涉及坝基岩体可灌性的研究中缺乏多影响因素下的岩体可灌性分析,同时亦未能够考虑评价过程中的不确定性问题。针对上述问题,提出基于模糊RES(岩石工程系统Rock Engineering System)-云模型的坝基岩体可灌性综合评价方法。首先,在系统分析影响岩体可灌性的相关因素的基础上,选取地质条件、浆液性质以及灌浆工艺等方面的12个因素构建评价指标体系;其次,基于RES理论从系统的角度科学合理地确定评价因子的重要性程度,并引入模糊理论克服RES方法中对主观因素的依赖,获取指标权重;再者,利用云模型考虑岩体可灌性评价过程中的随机性和模糊性的特点实现可灌性等级与评价指标值之间的不确定映射;最后,将基于模糊RES-云模型的综合评价方法应用于国内某大型水电工程,结果表明该方法具有较高的准确性和可靠性。

Study on evaluation of rock mass groutability of dam foundation based on Fuzzy RES-cloud model

The analysis and evaluation of rock mass groutability is the key point and difficult problem in dam foundation grouting engineering. Scientific and reasonable groutability evaluation has important theoretical and engineering significance to ensure grouting effect. There is a lack of analysis on the rock mass groutability of dam foundation under multi-influencing factors,and the uncertainty in the evaluation process cannot be considered at the same time. To solve these problems,this paper proposed a fuzzy comprehensive evaluation method to assess rock mass groutability based on Fuzzy RES(Rock Engineering System)-cloud model. First,based on a comprehensive analysis of the controlling factors,an evaluation index system with twelve factors representing the properties of geological condition,grout properties and grouting technology parameters was established. Then,with the help of RES theory,the degree of importance of evaluation factors were determined scientifically and rationally. In addition,fuzzy theory was introduced to overcome the depen-dence on subjective factor in RES method,obtaining more objective weights of evaluation factors. The cloud model method,with considering the issue of fuzziness and randomness,can realize the uncertain mapping between groutability levels and evaluation index values. The application of Fuzzy RES-cloud model in a large domestic hydropower project shows that the proposed method is of high accuracy and reliability.