泥水盾构掘进过程中的泥水劈裂现象现场试验研究
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| Published in | 浙江大学学报：A卷英文版 Vol. 15; no. 7; pp. 465 - 481 |
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| Main Author | |
| Format | Journal Article |
| Language | English |
| Published |
2014
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| Subjects | |
| Online Access | Get full text |
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| Bibliography: | Xue-yan LIU, Da-jun YUAN2 （1School of Civil Engineering, Beijing Jiao Tong University, Beijing 100044, China） 2 （ Tunnel and Underground Engineering Research Center of Minatry of Education, Beijing Jiao Tong University, Beijing 100044, China） 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 prop- erties 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 frac- turing 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. 33-1236/O4 In-situ slurry fracturing test, Initial fracturing pressure, Fracture propagation, Driving pressure, Slurry shieldtunneling |
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| ISSN: | 1673-565X 1862-1775 |