土工材料包裹碎石桩复合地基试验研究
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摘要
为了系统地探讨不同刚度土工材料包裹碎石桩复合地基的承载变形性能,开展了不包裹、包裹碎石桩复合地基现场对比试验以及不包裹、低和高刚度土工材料包裹碎石桩复合地基离心模型试验,分析了复合地基承载变形表征参数、稳定性在试验过程中的变化规律。结果表明:随着土工材料刚度的增加,桩顶、桩间土和路堤顶面的沉降显著减小,桩顶应力、桩土应力比显著增加;土工材料竖向包裹能够提高地基的整体稳定性、增加地基的承载能力、有效约束碎石桩侧向鼓胀变形。
引文
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[2]Van Impe W F.Soil Improvement Techniques and their Evolution[M].Rotterdam:Balkema,1989.
[3]Raithel M,Kirchenr A,Schade C,Leusink E.Foundation of Construction on very Soft Soils with Geotextile Encased Columns-State of the Art[C].Innovation in Grouting and Soil Improvement,USA:[s.n.],2015.
[4]Prisco D I,Galli C,Cantarelli A,et al.Geo-Reinforced Sand Columns:Small Scale Experimental Tests and Theoretical Modelling[C].Proc.8th International Conference on Geosynthetics.Yokohama:[s.n.],2006:1 685-1 688.
[5]欧阳芳,张建经,付晓,等.包裹碎石桩承载特性试验研究[J].岩土力学,2016(7).
[6]赵明华,顾美湘,张玲,等.竖向土工包裹体对碎石桩承载变形影响的模型试验研究[J].岩土工程学报,2014(9).
[7]Yoo C.Performance of Geosynthetic-Encased Stone Columns in Embankment Construction:Numerical Investigation[J].Journal of Geotechnical and Geoenvironmental Engineering,2010,136(8):1 148-1 160.
[8]陈建峰,童振湄,柳军修,等.竖向荷载下加筋碎石桩复合地基数值分析[J].岩土力学,2013(增2).
[9]Kaliakin M,Kaliakin V N,Meehan C L.Numerical Study of the Effect of Geosynthetic Encasement on the Behaviour of Granular Columns[J].Geosynthetics International,2010,17(3):132-143.
[10]陈建峰,王波,魏静,等.加筋碎石桩复合地基路堤模型试验[J].中国公路学报,2015(9).
[11]张玲,陈哲,赵明华.筋箍碎石桩复合地基桩土应力比的计算与分析[J].湖南大学学报:自然科学版,2017(1).
[12]Murugesan S,Rajagopal K.Study on the Behavior of Single and Group of Geosynthetic Encased Stone Columns[J].Journal of Geotechnical and Geoenvironmental Engineering,2010,136(1):129-139.
[13]Ali K,Shahu J T,Sharma K G.Model Tests on Geosynthetic-Reinforced Stone Columns:A Comparative Study[J].Geosynthetics International,2012,19(4):292-305.
[14]Afshar J N,Ghazavi M.Experiment Study on Bearing Capacity of Geosynthetic Reinforced Stone Columns[J].Arabian Journal for Science and Engnieering,2014,39(3):1 559-1 571.
[15]Chen J F,Li L Y,Xue J F,et al.Failure Mechanism of Geosynthetic-Encased Stone Columns in Soft Soils under Embankment[J].Geotextiles and Geomembranes,2015,43(5):424-437.
[16]李良勇,陈建峰,徐超,等.土工织物散体桩路堤土工效应研究[J].长江科学院院报,2017(2).