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- W2335731529 abstract "A method to estimate rock strength with TBM cutting force is proposed. It is assumed that thrust force for a disc cutter increases linearly with product of rock strength and cutting depth. This assumption leads to the following equations:(Rock strength)∝(Resultant thrust force)/(Penetration rate)(Rock strength)∝(Resultant torque)/(Penetration rate) 1.5By the method, rock strength along Niken-goya tunnel was estimated. The tunnel mainly consists of sandstone and slate. Estimated rock strength well agreed with the results of geological investigation; extremely small strength in fragmented slate, on the other hand, very large while boring through massive sandstone. The estimated rock strength was compared with the results of Schmidt hammer test, and it was found that the correlation between the two was excellent. Correlation between estimated rock strength and rock classification was also examined. It was found that the correlation existed, however, the classification used was too rough to evaluate the proposed method precisely.The proposed method is relatively simple and requires only three values: thrust force, torque and penetration rate. It can be said that the proposed method is promising for real-time estimation of rock strength on the face." @default.
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- W2335731529 date "1996-01-01" @default.
- W2335731529 modified "2023-09-26" @default.
- W2335731529 title "Estimation of Rock Strength with TBM Cutting Force and Site Investigation at Niken-goya Tunnel." @default.
- W2335731529 doi "https://doi.org/10.2473/shigentosozai.112.303" @default.
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