基于模糊综合评判的峨眉山玄武岩卸荷分带量化研究

Fuzzy comprehensive evaluation-based quantified study on classification of unloading zones of Emeishan basalt

为解决目前岩体卸荷指标及量化标准未统一、人为因素影响较大的问题,以我国西南地区水电工程主要建基岩体之一的峨眉山玄武岩为例,在收集、总结和分析部分水电工程卸荷研究成果基础上,采用裂隙率、张开裂隙率、裂隙宽度以及纵波波速为卸荷分带指标,确定了相应的量化标准。结合模糊综合评判法建立了分带模型,并对白鹤滩水电站进行了试算,证明了该模型的适用性。该成果对统一峨眉山玄武岩岩体卸荷分带指标及量化标准、更准确地对岩体进行卸荷分带具有参考价值。

In order to solve the problems from that the rock mass unloading indexes and quantitative criteria are not unified and the impacts from the huam factors are large,one of the main foundation rocks for the construction of hydropower project in the Southwest China——Emeishan basalt is taken as the study case herein,and then the relevant quantitive criteria are determined by adopting the fissure ratio,opened fissure ratio,fissure width and longitudinal wave velocity as the indexes for the classification of unloading zones on the basis of collecting,summerizing and analyzing a part of the unloading study results from the hydropower projects concerned. Combined with the fuzzy comprehensive evaluation method,a model for the classification of the zones is established,and then the trial calculation is made on the unloading zones within the site of Baihetan Hydropower Station,from which the adaptability of the model is verified. The achievement has a reference value for unifying the indexes for the classification of the unloading zones and quantitive criteria of Emeishan basalt and more accurately classifying the unloading zones of rock mass.