Model test of the group piles foundation of a high-speed railway bridge in mined-out area
- 51 Downloads
The research on the mechanism of pile-soil-cap-goaf interaction and settlement of high-speed railway bridge located in mined-out area is still relatively rare. By taking the pile group of Guanshandi bridge foundation in Hefei- Fuzhou high-speed railway as the prototype, a model test is carried out. According to the similarity theory, the similar constant is derived and the similar model material is determined. Meanwhile, three types of data including the bearing behavior of piles, and the settlement law, and soil among piles are investigated. It can be found that: the influence of goaf on the bearing capacity of pile is inversely to the loading degree, the larger of loading degree, the smaller impact of goaf on the bearing capacity. There is no negative side friction can been found in pile body and the degree of downward tendency for the barycenter of side friction layout is obvious for piles in goaf. Although the bearing ratio of soil resistance under cap is relatively large, the cap effect is suggested be ignored considering the characteristic of goaf. There is a maximum critical value for the uneven settlement of pile group in goaf, and when the value is reached, the uneven settlement stop growing anymore. In addition, the formula for calculating bearing capacity and settlement of pile group in goaf based on test results, theory analysis and related standard is established.
Keywordshigh-speed railway mined-out areas goaf group piles foundation physical model test bearing capacity settlement
Unable to display preview. Download preview PDF.
- 2.Zai J M, Jiang G, Wang X D, Li X W, He L M. Model test on pile-raft foundation interaction under ultimate load. Chinese Journal of Geotechnical Engineering, 2007, 29(11): 1597–1603 (in Chinese)Google Scholar
- 3.Liu D L, Zheng G, Liu J L, Li J X. Experimental study to reduce differential settlements of raft of composite foundation with rigid piles. Chinese Journal of Geotechnical Engineering, 2007, 29(4): 517–523 (in Chinese)Google Scholar
- 4.Zuo B C, Cheng C X, Liu C H, et al. Research on similar material of slope simulation experiment. Rock and Soil Mechanics, 2004, 25 (11): 1805–1808Google Scholar
- 5.Fu Z L, Niu X L, Wang S H, Tai A. Quantitative study on equivalent materials testing. Guti Lixue Xuebao, 2006, 27(s): 169–173(in Chinese)Google Scholar
- 6.Lei J S, Yang J S, Zhou C L, Wei S U, Zhang X Z. Study on simulating material test of karst geological model of Guangzhou railway traffic. Journal of Railway Science and Engineering, 2007, 4 (4): 73–77Google Scholar
- 7.Ministry of Railways of the People’s Republic of China. Code for Design of High Speed Railway (TB 10621–2009). Beijing: China Railway Publishing House, 2010 (in Chinese)Google Scholar
- 8.Liu J B. Understanding and Application of Technical Specification for Construction of Pile Foundation. Beijing: China Architecture & Building Press, 2008 (in Chinese)Google Scholar
- 9.Liu J L, Yuan Z L. Cap-pile-soil interaction bored pile groups in silt and calculation on bearing capacity. Chinese Journal of Geotechnical Engineering, 1987, 9(6): 1–15 (in Chinese)Google Scholar
- 10.Han X, Zhang N R. In-situ tests on load transfer mechanism of group piled foundation in Beijing. Chinese Journal of Geotechnical Engineering, 2005, 27(1): 74–80 (in Chinese)Google Scholar
- 11.Fellenius B H. Basics of Foundation Design. Richmond, BC: BiTech Publishers Limited, 1999Google Scholar
- 12.Zha J G, Guo G L, Zhao H T, Jia X G. Present situation and prospect of correction system for probability integral method. Metal Mine, 2008, (1):15–18Google Scholar