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Experimental Study of the Influence of Excavation Surface Stability and Sand Flowability Caused by Dense Slurry–Earth Pressure Balance Shield Tunneling in Silty Sand Stratum
Joint Authors
Min, Fanlu
Qian, Yongjin
Mo, Zhenze
Fan, Xihui
Source
Issue
Vol. 2020, Issue 2020 (31 Dec. 2020), pp.1-14, 14 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2020-08-25
Country of Publication
Egypt
No. of Pages
14
Main Subjects
Abstract EN
Silty sand is highly permeable and has a large internal friction angle.
To ensure the stable and efficient construction of the Earth pressure balance (EPB) shield in silt stratum, it is necessary to reduce the disturbance to the stratum during tunneling and reduce the risk of spewing and blocking during soil discharge.
Thus, a new type of dense slurry-EPB shield construction technology is proposed.
Using a custom-made test device, the consolidation tests were conducted on sand after mixing it with different amounts of slurry to study the change in the pore pressure in the mixed soil and sand stratum and analyze the stress transmission rule.
In addition, slump tests were conducted on the mixed soil to study the change in the fluidity.
Based on the laboratory test results, a field investigation was carried out to study the effects of the amount of slurry addition on the pore pressure in the stratum, the driving parameters, and the sand’s flowability during shield tunneling.
The results show that when the amount of slurry reaches a certain value, the filter cake effect occurs.
The greater the amount of slurry added during the shield tunneling, the smaller the rate of change of the pore pressure in the stratum.
When the amount of BC2 slurry added reached 8 m3 per ring, the rate of change was reduced by 57%, and the slump value improved by 93%.
The type of filter cake of the DS-EPB shield was only internal filter cake during tunneling, which reduced the disturbance of the excavation face and improved the flowability of the sand.
These results are of great significance to the application and promotion of DS-EPB shields in sandy cobble strata.
American Psychological Association (APA)
Qian, Yongjin& Min, Fanlu& Mo, Zhenze& Fan, Xihui. 2020. Experimental Study of the Influence of Excavation Surface Stability and Sand Flowability Caused by Dense Slurry–Earth Pressure Balance Shield Tunneling in Silty Sand Stratum. Advances in Civil Engineering،Vol. 2020, no. 2020, pp.1-14.
https://search.emarefa.net/detail/BIM-1125197
Modern Language Association (MLA)
Qian, Yongjin…[et al.]. Experimental Study of the Influence of Excavation Surface Stability and Sand Flowability Caused by Dense Slurry–Earth Pressure Balance Shield Tunneling in Silty Sand Stratum. Advances in Civil Engineering No. 2020 (2020), pp.1-14.
https://search.emarefa.net/detail/BIM-1125197
American Medical Association (AMA)
Qian, Yongjin& Min, Fanlu& Mo, Zhenze& Fan, Xihui. Experimental Study of the Influence of Excavation Surface Stability and Sand Flowability Caused by Dense Slurry–Earth Pressure Balance Shield Tunneling in Silty Sand Stratum. Advances in Civil Engineering. 2020. Vol. 2020, no. 2020, pp.1-14.
https://search.emarefa.net/detail/BIM-1125197
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1125197