摘要
评价岩体地质强度指标(GSI)时,因其基本要素取值过程存在较大的随机性和模糊性,很难用静态的模式去准确衡量每个影响因素,岩体特征参量的模糊性反映其内在的不确定性,模糊数学理论为更客观地刻画这种特性提供有力的数学手段。首先引入岩体节理组数Jn、节理间距l和岩体完整性系数Kv描述岩体结构特征,大比例尺波形系数Jw、小比例尺光滑系数Js和节理蚀变系数Ja描述结构面条件,然后把多因素模糊综合评判理论应用到GSI系统的评价中去,并利用层次分析法确定模糊评判因素的权重,建立GSI系统的模糊综合评判模型。工程应用表明,这种方法针对性较强、误差较小,能够将地质调查勘探结果、试验结果、统计数据以及专家意见有机结合起来,从而减小研究者决策时主观性。GSI系统的模糊综合评判法为GSI系统量化提供新的途径。
When evaluating geological strength index(GSI),there are great randomness and fuzziness to confirm the value of its basic elements. As a consequence,it is difficult to accurately measure the impact of each influential factor. The fuzziness of the parameter of rock mass characteristics reflects its inherent uncertainty. The fuzzy mathematics theory provides strong measures to depict these characteristics. This article introduces the number of joint sets(Jn),joint spacing(l) and the integrity coefficient of rock mass(Kv) to describe the structure features of rock mass and introduces large-scale waviness(Jw),small-scale smoothness(Js) and joint altered coefficient(Ja) to describe the conditions of structural planes. Then multifactor fuzzy-synthetical evaluation is applied to the system of GSI. Meanwhile,analytic hierarchy process is adopted in determining the weight of each factor. As a result,the model of fuzzy-synthetical evaluation of GSI is established. Project applications prove that this evaluation method has strong pertinence and high accuracy and it can organically combine geological surveys,experiment data, statistics and expert opinions,so this evaluation method can decrease the subjectivity of researchers′decisions. The method of fuzzy-synthetical evaluation of GSI does provide a new approach to quantizing GSI system.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2013年第S2期3100-3108,共9页
Chinese Journal of Rock Mechanics and Engineering
基金
铁道部重点项目(KCL10062530)
关键词
岩石力学
地质强度指标
模糊综合评判法
层次分析法
岩体力学参数
地质调查
rock mechanics
geological strength index(GSI)
fuzzy-synthetical evaluation method
analytic hierarchy process
mechanical parameters of rock mass
geological survey
