北京工人体育场密实砂卵石层水泥土复合管桩试验研究
摘要:以北京工人体育场改造复建项目作为工程背景,分析了水泥土复合管桩在密实砂卵石地层中的工作性态,并给出了水泥土复合管桩在砂卵石地层中的加载试验与数值模拟结果对比。采用FLAC3D软件模拟了水泥土复合管桩加载以及其与地层相互作用机理。结合试验与模拟结果,分析了水泥土复合管桩的破坏机理。结果表明,水泥土复合管桩在竖向荷载作用下的荷载-位移曲线模式是典型的摩擦桩工作模式,桩端阻力约占桩顶荷载的1/3;桩侧摩阻力荷载传递具有双层模式特点,即荷载由管桩先传递到管桩周围的水泥土桩,再由水泥土桩传递到桩间土中;水泥搅拌桩在砂卵石地层中可形成刚度大、强度高的水泥土外桩;管桩的压入有效提高了水泥土复合管桩的刚度,而水泥土外桩有效改善了桩土界面的摩擦接触效应,结合桩端砂卵石层,可有效提高水泥土复合管桩的承载力。
关键词:北京工人体育场;水泥土复合管桩;预应力管桩;砂卵石层;桩身轴力;桩侧阻力;桩承载力;
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[2] 刘金砺,高文生,邱明兵.建筑桩基技术规范应用手册[M].北京:中国建筑工业出版社,2010.
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[5] 陈国兴.岩土地震工程学[M].北京:科学出版社,2007.
[6] 黄雨,舒翔,叶为民,等.桩基础抗震研究的现状[J].工业建筑,2002,32(7):50-53,61.
[7] 刘惠珊.桩基震害及原因分析——日本阪神大地震的启示[J].工程抗震,1999,21(1):37-43.
[8] 刘惠珊,乔太平.可液化土中桩基设计计算方法的探讨[J].工业建筑,1983,13(4):19-24.
[9] 何宁,娄炎.路堤下刚性桩复合地基的设计计算方法研究[J].岩土工程学报,2011,33(5):797-802.
[10] NUNEZ M A,BRIANÇON L,DIAS D.Analyses of a pile-supported embankment over soft clay:full-scale experiment,analytical and numerical approaches[J].Engineering Geology,2013,153:53-67.
[11] 陈仁朋,徐正中,陈云敏.桩承式加筋路堤关键问题研究[J].中国公路学报,2007,20(2):7-12.
[12] 庄妍,崔晓艳,刘汉龙.桩承式路堤中土拱效应产生机理研究[J].岩土工程学报,2013,35(S1):118-123.
[13] 莫海鸿,黄文锋,房营光.不同桩长对无持力层刺入工况下刚性网格-桩加固路基的影响[J].岩石力学与工程学报,2013,32(S1):2944-2950.
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[16] 盛平,张龑华,甄伟,等.北京工人体育场结构改造设计方案及关键技术[J].建筑结构,2021,51(19):1-6.
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Experimental study on cement-soil composite pipe pile in dense sand pebble layer of Beijing Workers Stadium
Abstract: Based on the Beijing Workers Stadium reconstruction project as an engineering background, the working state of cement-soil composite pipe pile in dense sand pebble formation layer was analyzed, and the comparison between the loading test and numerical simulation results of cement-soil composite pipe pile in sand pebble layer was given. FLAC3D software was used to simulate the loading of cement-soil composite pipe pile and its interaction mechanism with stratum. Combined with the test and simulation results, the failure mechanism of cement-soil composite pipe pile was analyzed. The results show that the load-displacement curve mode of cement-soil composite pipe pile under vertical load is a typical working mode of friction pile, and pile tip resistance accounts for about 1/3 of pile top load. Pile side friction load transfer is characterized by a double-layer mode, that is, the load is first transferred from the pipe pile to the cement-soil pile around the pipe pile and then from the cement-soil pile to the soil between the piles. Cement mixing pile can form cement-soil pile with high stiffness and strength in sand pebble layer. The stiffness of soil-cement composite pipe pile is improved effectively by pressing pipe pile, and the cement-soil external pile can effectively improve the friction and contact effect of pile-soil interface, which can effectively improve the bearing capacity of cement-soil composite pipe pile when combined with the sand pebble layer at the pile end.
Keywords: Beijing Workers Stadium; cement-soil composite pipe pile; prestressed pipe pile; sand pebble layer; axial force of pile body; lateral pile resistance; bearing capacity of pile
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