FDA判别分析法在隧洞围岩分类中的应用

Application of FDA Discriminant Analysis Method in Classification of Tunnel Surrounding Rocks

针对隧道围岩分类问题,以西南某输水隧洞围岩为研究对象,综合选用水电围岩分类法和Q系统分类中的岩石饱和单轴抗压强度、体积节理数、岩体完整性系数、主要结构面产状、岩石质量指标、强度应力比、裂面风化情况、节理组数等8个指标作为判别因子,建立相应的FDA判别模型。利用回代估计法对建模数据逐一进行检验,一致率达89.5%。将判别模型应用于该隧道的剩余标段,预测结果与实际情况吻合。研究结果表明,Fisher判别分析法用于围岩分类直观易懂,正确率高,可为类似条件下隧道工程的设计、施工、监测和进一步的理论研究提供参考,具有一定的工程应用价值。

Aiming at the classification of tunnel surrounding rock,and taking the surrounding rock of a water conveyance tunnel in southwest China as the research object,this paper comprehensively selects 8 indicators such as uniaxial saturated compressive strength of rock,volume joint count,rock mass integrity coefficient,main structural surface occurrence,rock quality,strength-stress ratio,crack weathering.and joint set in hydropower surrounding rock classification and Q system classification as the discriminant factors to establish the corresponding Fisher discriminant model,tests the modeling data one by one by the back-substitution estimation method,with the consistency rate of 89.5%,and applies the discriminant model to the remaining sections of the tunnel to obtain the prediction results,which are consistent with the actual situation.The research results show that Fisher discriminant analysis is easy to understand and accurate in the classification of surrounding rock,which can provide reference for the design,construction,monitoring and further theoretical research of tunnel engineering under similar conditions,with certain engineering application value.