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CLC number: U45

On-line Access: 2014-07-08

Received: 2014-01-16

Revision Accepted: 2014-05-16

Crosschecked: 2014-06-23

Cited: 3

Clicked: 6671

Citations:  Bibtex RefMan EndNote GB/T7714

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Journal of Zhejiang University SCIENCE A 2014 Vol.15 No.7 P.465-481


An in-situ slurry fracturing test for slurry shield tunneling*

Author(s):  Xue-yan Liu1,2, Da-jun Yuan1,2

Affiliation(s):  1. School of Civil Engineering, Beijing Jiao Tong University, Beijing 100044, China; more

Corresponding email(s):   yuandj603@163.com

Key Words:  In-situ slurry fracturing test, Initial fracturing pressure, Fracture propagation, Driving pressure, Slurry shield tunneling

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Xue-yan Liu, Da-jun Yuan. An in-situ slurry fracturing test for slurry shield tunneling[J]. Journal of Zhejiang University Science A, 2014, 15(7): 465-481.

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%A Da-jun Yuan
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%DOI 10.1631/jzus.A1400028

T1 - An in-situ slurry fracturing test for slurry shield tunneling
A1 - Xue-yan Liu
A1 - Da-jun Yuan
J0 - Journal of Zhejiang University Science A
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DOI - 10.1631/jzus.A1400028

When performing a slurry shield excavation in the shallow earth cover under a waterway, the support pressure is difficult to calibrate. If not carefully monitored, slurry fracturing or even slurry breakout can occur; water from the river can rush into the slurry circulating system, threatening the security of the project. In this study, an in-situ slurry fracturing apparatus was created to analyze the phenomena of slurry fracturing and fracture propagation. First, the fracturing test procedures and the method of identifying slurry fracturing are introduced. Then, mechanical models of the slurry fracturing and fracture propagation are described and validated with in-situ tests. The models provide fairly good predictions: the driving pressure is related to the properties of both the soil and slurry. Slurry with large parameters for bulk density and viscosity is beneficial for preventing slurry fracturing propagation. However, such parameters have little influence and can be neglected when determining the initial fracturing pressure. Preventing slurry fracturing and breakout is important for not only shield tunnel preparation, but also shield tunneling under dangerous conditions. A crucial factor is setting and limiting the maximum support pressure values. These pressures can be obtained through the in-situ tests and mechanical models described here. These results provide useful references for the Weisan Road Tunnel to be built under the Yangtze River in Nanjing, China.




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