不同配筋形式下微型桩桩顶变形量研究
Study on Deformation of Micropile Tip Under Different Reinforcement Forms
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摘要: 微型桩的配筋形式多种多样，但目前关于哪种形式可以更好地发挥其抗滑作用仍存在着较大的分歧。基于对微型桩力学特性的研究，建立其桩顶水平位移的力学模型，分析同一外力作用下不同配筋形式微型桩桩顶变形情况。理论计算分析得到桩周配筋桩的桩顶变形量最小，钢管桩的桩顶变形量最大；桩心配筋桩的配筋率虽等同于桩周配筋桩，但其桩顶变形量明显大于桩周配筋桩和锚筋桩。最后，通过数值模拟对理论计算分析进行了验证，结果基本一致，桩周配筋桩抗弯、抗变形的效果远甚于其他配筋形式微型桩，是锚筋桩和钢管桩的有效组合形式。Abstract: The reinforcement form is varied, but there are still great differences about which form can play its anti-sliding better. Based on the research of mechanical properties of micro-piles, we build the mechanical model of pile head horizontal displacement, and then analyze pile top deformation of them with different reinforcement forms under identical external force. The deformation of tip of micropiles with surrounding reinforcement arrangement tends to be minimum and steel pipe pile to be maximum through theoretical calculation. Although the reinforcement ratio of micropiles with center reinforcement arrangement is equivalent to micropiles with surrounding reinforcement arrangement, the former’s pile tip deformation is greater than the later and anchor piles. At last, we verify the results of theoretical analysis through numerical simulation, and we find that they are basically the same. As for bending and anti-deformation, the micropile with surrounding reinforcement arrangement is far more effective than that of other forms of reinforcement micropile. It is an effective combination of anchor piles and steel pipe piles.
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Keywords:
- micropile /
- form of reinforcement /
- displacement of pile tip /
- inertia moment /
- numerical analysis
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[1] 吴顺川，高永涛，金爱兵．失稳高陡路堑边坡桩锚加固方案分析[J]．岩石力学与工程学报，2005，24（21）： 3954－3958. [2] 朱宝龙，胡厚田，张玉芳，等．钢管压力注浆型抗滑挡墙在京珠高速公路Ｋ108滑坡治理中的应用[J]．岩石力学与工程学报，2006，25（2）：399－406. [3] 姜春林，吴顺川，吴承霞，等．复活古滑坡治理及微型抗滑桩承载机理[J]．北京科技大学学报，2007，29（10）：975－979. [4] 刘凯，刘小丽，苏媛媛．微型抗滑桩的应用发展研究现状[J]．岩土力学，2008，28（S）：675－679. [5] 闫金凯．滑坡微型桩防治技术大型物理模型试验研究[D]．西安：长安大学，2010. [6] 梁炯．滑坡灾害防治技术微型桩群桩物理模拟试验[D]．西安：长安大学，2010. [7] 梁炯，门玉明，石胜伟．滑坡治理微型桩群配筋形式模型试验[J]．地质灾害与环境保护，2013，24（1）：75. [8] 吴璋，何坤，王增琪，等．微型桩的被动锚固作用机理[J]．煤田地质与勘探，2012，40（6）：53－57. [9] 龙驭球，包世华．结构力学教程（Ｉ）[Ｍ]．北京：高等教育出版社，2000．
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