ISSN 2096-4498
CN 44-1745/U
Tunnel Construction ›› 2014, Vol. 34 ›› Issue (2): 153-157.DOI: 10.3973/j.issn.1672-741X.2014.02.011
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ZHAO Wenqiang
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Abstract:
Recently suspended piles always exist in deep foundation pits, which could cause potential safety risks. In this paper, the “suspended piles” of a stripshaped foundation pit of Qingdao Metro located in hardsoft heterogeneous ground is studied. First, excavation and support scheme is proposed for the project on basis of the geological conditions and the surrounding environment; Secondly, the stability of the upper pilestrut bracing system and the lower rock slope of the foundation pit is analyzed by means of elastic resistance method and equivalent passive earth pressure method. The practice shows that: 1) In Qingdao, the “pilestrut ” support system is suitable for the upper soil strata, and the bolting and shotcreting support system is suitable for the lower rock slope; 2) The micro steel pipe piles adopted in the cutting of the vertical rock slopes of the foundation pit play the role of advance support, presplitting and vibration reduction; 3) The calculation method proposed is suitable for the design of the suspended pile support system.
Key words: foundation pit in soilrock ground, suspended pile, foundation pit support, micro steel pipe pile, pilestrut bracing system
ZHAO Wenqiang. Design of Support of Deep Foundation Pits in Hardsoft Heterogeneous Ground[J]. Tunnel Construction, 2014, 34(2): 153-157.
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URL: http://www.suidaojs.com/EN/10.3973/j.issn.1672-741X.2014.02.011
http://www.suidaojs.com/EN/Y2014/V34/I2/153