带立柱浅基础侧向极限承载力探讨
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摘要
在分析影响带立柱浅基础倾覆机理和侧向稳定性的基础上,综合考虑桩前土的破坏模式,结合极限分析上限定理,推导了构筑物基础的侧向承载力极限公式。结果表明,公式中通常取n=2或3即可满足要求,应用该公式对相关构筑基础进行分析,针对不同土体的安全系数要求,可以得到其满意的设计结果。本文的研究结果为浅基础侧向承载力的计算提供了一种新的途径。
Through analysing the stability principle of the shallow foundation with short pole,combined with failure mode of soil before pile and upper rule of limited analysis method,theory solutions of transverse limit capacity about structure foundation were deduced.The theoretical solutions were verified throuth the engineering pratice contrasted with the standard formula,when n=2 or 3,it satisfies the practical engineering,and the results are reasonable.The research results can provide an new approach to calculate transverse limit capacity of shallow foundation.
Through analysing the stability principle of the shallow foundation with short pole,combined with failure mode of soil before pile and upper rule of limited analysis method,theory solutions of transverse limit capacity about structure foundation were deduced.The theoretical solutions were verified throuth the engineering pratice contrasted with the standard formula,when n=2 or 3,it satisfies the practical engineering,and the results are reasonable.The research results can provide an new approach to calculate transverse limit capacity of shallow foundation.
引文
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[2]ZHU D Y.The least upper bound solutions for bearing capac-ity[J].Soils and Foundations,2000,40(1):123-129.
[3]Michalowski R L,Park N.Admissible stress fields and arch-ing in piles of sand[J].Geotechnique,2004,54(8):529-538.
[4]Bolton M D,Lau C K.Vertical bearing capacity factors forcircular and strip footings on Mohr-Coulomb soil[J].Cana-dian Geotechnical Journal,1993,38(5):1090-1096.
[5]Chen W F.Limit analysis and soil plasticity[M].Amster-dam:Elsevier Scientific Publishing Company,1975:1-80.
[6]Ukritchon B,Whittle A J,Klanvijit C.Calculations of bear-ing capacity factor using numerical limit analysis[J].Journalof Geotechnical and Geoenvironmental Engineering,2003,129(5):468-474.
[7]Michalowski R L.An estimate of the influence of soil weighton bearing capacity using limit analysis[J].Soils and Foun-dations,1997,37(4):57-64.
[8]YIN Jian-hua,WANG Yue-jie,Selvadurai A P.Influenceof non-association on bearing capacity of a strip footing[J].Journal of Geotechnical and Geoenvironmental Engineering,2001,127(11):985-989.
[9]YANG Xiao-li.Upper bound analysis of active earth pres-sure with different fracture surface and nonlinear yield criteri-on[J].Theoretical and Applied Fracture Mechanics,2007,47(1):46-56.
[10]李云鹏,王芝银,韩常领.不同围岩类别小间距隧道施工过程模拟研究[J].岩土力学,2006,27(1):11-16.LI Yun-peng,WANG Zhi-yin,HAN Chang-ling.Simulat-ingstudy on construction process of tunnels with small spacingfor difference classes of surrounding rocks[J].Rock and SoilMechanics,2006,27(1):11-16.
[11]李云鹏,王芝银,韩常领.考虑地震影响的小间距隧道围岩流变损伤[J].长安大学学报:自然科学版,2006,26(2):51-56.LI Yun-peng,WANG Zhi-yin,HAN Chang-ling.Rheologicdamage and earthquake influence on surrounding rock ofsmall spacing tunnels[J].Journal of Changan University:Natural Science Edition,2006,26(2):51-56.
[12]王明年,李志业,关宝树.3孔小间距浅埋暗挖隧道地表沉降控制技术研究[J].岩土力学,2002,23(6):821-824.WANG Ming-nian,LI Zhi-ye,GUANG Bao-shu.Researchon controlling measures for ground surface settlement of threelittle distance parallel shallow embedded tunnels[J].Rockand Soil Mechanics,2002,23(6):821-824.
[13]王明年,李志业,刘智成.软弱围岩3孔小间距平行浅埋隧道施工力学研究[J].铁道建筑技术,2002(4):11-14.WANG Ming-nian,LI Zhi-ye,LIU Zhi-cheng.A study onconstruction mechanics of three parallel shallow tunnels withsmall spacing in weak surrounding rock[J].Railway Con-struction Technology,2002(4):11-14.
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