Classification and Predictive Research on Excavability of Surrounding Rock for TBM Construction in Small Section with Soil-Rock Composite Geological Condition

YANG Yao-hong; LIU De-fu; ZHANG Zhi-xiao; HAN Xing-zhong; SUN Xiao-hu

doi:10.11988/ckyyb.20221309

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Journal of Changjiang River Scientific Research Institute ›› 2024, Vol. 41 ›› Issue (3) : 79-87. DOI: 10.11988/ckyyb.20221309

Rock-Soil Engineering

Classification and Predictive Research on Excavability of Surrounding Rock for TBM Construction in Small Section with Soil-Rock Composite Geological Condition

YANG Yao-hong^1,2, LIU De-fu¹, ZHANG Zhi-xiao³, HAN Xing-zhong¹, SUN Xiao-hu^1,4

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Abstract

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.

Key words

tunnel boring machine (TBM) / small section / soil-rock combination / classification of excavability / PCA-RF model

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YANG Yao-hong, LIU De-fu, ZHANG Zhi-xiao, HAN Xing-zhong, SUN Xiao-hu. Classification and Predictive Research on Excavability of Surrounding Rock for TBM Construction in Small Section with Soil-Rock Composite Geological Condition[J]. Journal of Changjiang River Scientific Research Institute. 2024, 41(3): 79-87 https://doi.org/10.11988/ckyyb.20221309

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