Measurement of the unconfined compressive strength (UCS) of the rock is critical to assess the quality of the rock mass ahead of a tunnel face. In this study, extensive field studies have been conducted along 3,885 m of the new Nagasaki tunnel in Japan. To predict UCS, a hybrid model of artificial neural network (ANN) based on genetic algorithm (GA) optimization was developed. A total of 1350 datasets, including six parameters of the Measurement-While- Drilling data and the UCS were considered as input and output parameters respectively. The multiple linear regression (MLR) and the ANN were employed to develop contrast models. The results reveal that the developed GA-ANN hybrid model can predict UCS with higher performance than the ANN and MLR models. This study is of great significance for accurately and effectively evaluating the quality of rock masses in tunnel engineering.
Key Words
unconfined compressive strength; measurement-while-drilling data; ANN; genetic algorithm; tunnel face
Address
Jiankang Liu, Yuanchao Zhang and Yujing Jiang — Graduate School of Engineering, Nagasaki University, 1-14 Bunkyo-machi, 852-8521 Nagasaki, Japan
Hengjie Luan — College of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao 266590, China
Osamu Sakaguchi — Department of Civil Engineering, Konoike Construction Co., Ltd., 3-6-1, Kitakyuhoji-machi, Chuo-ku, 541-0057 Osaka, Japan
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