%0 Journal Article
%A YANG Yao-hong
%A LIU De-fu
%A ZHANG Zhi-xiao
%A HAN Xing-zhong
%A SUN Xiao-hu
%T Classification and Predictive Research on Excavability of Surrounding Rock for TBM Construction in Small Section with Soil-Rock Composite Geological Condition
%D 2024
%R 10.11988/ckyyb.20221309
%J Journal of Yangtze River Scientific Research Institute
%P 79-87
%V 41
%N 3
%X The efficient construction and intelligent control of TBM heavily rely on the classification and real-time identification of surrounding rock excavability. To address this, we establish a classification standard for surrounding rock excavability in TBM construction under geological conditions characterized by small sections and soil-rock combinations based on actual data (penetration thrust and torque per unit penetration) from the Anyang Western Water Diversion Project. Moreover, we introduce the PCA-RF model for real-time identification and prediction of surrounding rock excavability, and then compared the results with those of BP, SVR, and RF models. Our research yields the following conclusions: 1) The classification standard for surrounding rock excavability in TBM construction under the geological conditions of small sections and soil-rock combinations proves to be applicable. This standard resolves the limitations of traditional methods for classifying surrounding rock in soil-rock composite environments. 2) The PCA-RF model demonstrates an identification and prediction accuracy of 98.3% for the surrounding rock excavability in TBM construction under the geological conditions of small sections and soil-rock combinations. This accuracy surpasses that of the BP, SVR, and RF models and fulfills the demands of engineering construction.
%U http://ckyyb.crsri.cn/EN/10.11988/ckyyb.20221309