Buoyancy Reduction Coefficients for Underground Silos in Sand and Clay
- 60 Downloads
To elucidate the anti-floating problem of underground cylindrical grain silos, the water buoyancy effect and groundwater buoyancy reduction were evaluated for underground cylindrical silos in sand and clay. For testing, three silos of different diameters were installed in testing tanks with sand or clay, which were subsequently saturated with water. The buoyancy models were first verified using silos submerged in pure water. Using these models in the underground silo tests, factors favorable to anti-floating design, such as the effects of friction between the silo wall and soil and the negative pressure at the bottom of the granary, were considered. In dense well-graded saturated coarse sand, the comprehensive buoyancy reduction coefficient was in a range of 0.40–0.45 and the buoyancy reduction coefficient was 0.95. In saturated clay, the comprehensive buoyancy reduction coefficient was in a range of 0.50–0.53 and the buoyancy reduction coefficient was 0.79. These results demonstrate the requirement for considering the buoyancy reduction of different soils for the anti-floating design of underground silos.
KeywordsSilo Groundwater buoyancy Reduction coefficient Model test
This study is financially supported by the Scientific Special Expenditure of Food Industry in China (Grant No. 201513001), the National Natural Science Foundation of China (Grant No. 51509084, 51708349), the Cultivation Plan for Youth Backbone Teachers by Henan University of Technology, the Key Scientific Research Project of Colleges and Universities in Henan Province (Grant No. 15A560022), and the National Natural Science Foundation of Guangxi (Grant No. 2013GXNSFBA019236).
Compliance with Ethical Standards
Conflict of interest
The authors declare no conflict of interest.
- 1.Leung EHY, Ng CWW (2007) Wall and ground movements associated with deep excavations supported by cast in situ wall in mixed ground conditions. J Geotech Geoenviron Eng 133(2):129–143. https://doi.org/10.1061/(ASCE)1090-0241(2007)133:2(129) CrossRefGoogle Scholar
- 4.Mohri Y, Fujita N, Kawabata T (2001) A simulation on uplift resistance of buried pipe by DEM. In: ASCE pipeline division specialty conference, 2001, July 15–18, San Diego, CA. https://doi.org/10.1061/40574(2001)49
- 5.Kaul K (2010) Cut-and-cover metro structures: geo-structure design: an integrated approach, 1st edn. CRC Press, New YorkGoogle Scholar
- 6.Li G-X (2011) Some problems about principle of effective stress. Chin J Geotech Eng 33(2):315–320 (in Chinese) Google Scholar
- 7.The State Standard of the People’s Republic of China (2009) Code for investigation of geotechnical engineering. China Building Industry Press, BeijingGoogle Scholar
- 8.Zhang D-X (2007) Experimental study on anti-floating of underground structures. Dissertation, Shanghai Jiaotong University (in Chinese) Google Scholar
- 9.Mei G-X, Song L-H, Zai J-M (2009) Experimental study on reduction of groundwater buoyancy. Chin J Geotech Eng 31(9):1476–1480 (in Chinese) Google Scholar
- 11.Li G-X, Wu J-M (2003) Some problems about the calculation of uplift force on underground structures. Soil Eng Found 17(3):39–41 (in Chinese) Google Scholar
- 12.Ding X-L (2007) Test method for determination of buoyancy reduction factor for building foundations in saturated media. China Sci Technol Inf 7:267–268 (in Chinese) Google Scholar
- 13.Ye J-N, Liu G-B (2010) Anti-floating safety design of structures in metro station considering friction resistance enclosure protection. Rock Soil Mech 31(S1):279–283 (in Chinese) Google Scholar
- 14.Cui Y, Cui J-H, Wu S-H (1999) Model test of underground structure buoyancy. Spec Struct 16(1):32–35, 39 (in Chinese) Google Scholar
- 15.Zhang Q, Song L-H, Mei G-X (2011) Model experiment on foundation buoyancy in clay. Geotech Investig Surv 39(9):37–41 (in Chinese) Google Scholar
- 16.Xiang K, Zhou S-H, Zhan C (2010) Model test study of buoyancy on shallow underground structure. J Tongji Univ (Nat Sci) 38(3):346–357 (in Chinese) Google Scholar
- 17.Tian W (2013) Study on bearing mechanism and calculation method about water buoyancy of underground structure. Arch Technol 44(6):500–502 (in Chinese) Google Scholar