范数灰色理论在三峡库区危岩形成影响因子综合评价中的应用

APPLICATION OF GREY CORRELATION OF NORM THEORY TO COMPREHENSIVE ASSESSMENT OF PERILOUS ROCK FACTORS

危岩的形成是多因子异变耦合的结果。地形地貌、地质构造、地层岩性等是形成危岩的内因,而水体因素、风化作用、地震、植被和不合理的人类活动等是形成危岩外因。将范数灰色理论用于分析危岩形成的影响因子,即引进关联系数列的2个范数近距和远距,对危岩的影响因素进行量化分析,获取其影响因子关联度和权重系数,进而较直观地反映各影响因子对危岩形成的影响程度。以三峡库区万州太白岩危岩为例,进行范数灰关联度计算,结果显示,万州太白岩危岩形成的主控因子为危岩主控结构面,其次为地下水,而危岩体基座前缘斜坡倾向、危岩体临空面倾角、危岩体出露高度以及风化程度等也对危岩形成和失稳产生较大影响,研究成果对于正确认识三峡库区的危岩灾害具有一定的指导意义。

Perilous rock formation is the result of multiple correlated factors coupling.It is found that the inside factors of perilous rock are geomorphology,geologic structure and rock layer,etc.,and the outside factors are rainstorm,earthquake,ground water,weathering,vegetation and unreasonable mankind engineering.Based on the norm theory,the influence factors of perilous rock are measured by analyzing its influence factors and adding to the two norm numbers near and far distances.The correlation and weight coefficients of factors are obtained.Taking Wanzhou Taibaiyan perilous rock,in the area of Three Gorges Reservoir,as an example,the grey correlation of the norm of Taibaiyan perilous rock is calculated.The result shows that the first controlling factors of perilous rock is the main controlling fissure,and the second factor is groundwater,which affects formation and stability of perilous rock foundation,and dip angle of free face,height and weathering perilous rock.The results can provide significant reference to the acknowledge of the disaster of perilous rock in the Three Gorges Reservoir.