竖向荷载作用下预应力抗拔灌注桩三维有限元分析
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摘要
预应力抗拔灌注桩通过对桩体施加预应力产生的抗拔力可以有效阻止裂缝发展,在承载力不变的前提下降低桩基钢筋用量,节省工程成本。借助有限元数值分析方法,通过各种符合抗拔桩工作性状的参数的合理假定,对竖向荷载作用下预应力抗拔灌注桩的工作性状及桩-土动力相互作用进行了研究。结论表明:桩径增大和桩长增长将导致桩顶位移量减小;预应力抗拔灌注桩与普通桩相比具有更好的变形协调能力和承受上拔荷载的能力。
Based on anti-uplift force caused by prestress applied to pile body,prestressed anti-uplift filling pile may resist cracking development effectively and decrease reinforcement use amount and engineering cost under unchanged bearing capactiy. With the aid of finite element numerical analysis tools,through reasonable assumption of parameters about working character that accords with uplift pile,we studied the working traits of single pile with vertical load and dynamic interaction between pile and soil. Results show that the increase of diameter and length of the pile can lead to decrease of pile top displacement,and compared with the ordinary pile,the prestressed anti-uplift filling piles has better deformation coordinate ability and the ability to bear the uplift load.
Based on anti-uplift force caused by prestress applied to pile body,prestressed anti-uplift filling pile may resist cracking development effectively and decrease reinforcement use amount and engineering cost under unchanged bearing capactiy. With the aid of finite element numerical analysis tools,through reasonable assumption of parameters about working character that accords with uplift pile,we studied the working traits of single pile with vertical load and dynamic interaction between pile and soil. Results show that the increase of diameter and length of the pile can lead to decrease of pile top displacement,and compared with the ordinary pile,the prestressed anti-uplift filling piles has better deformation coordinate ability and the ability to bear the uplift load.
引文
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[3]吴兴旭,于志强,庄卫林.岩层中抗拔桩的承载力计算方法探讨[J].西南交通大学学报,2002,37(2):190-194.Wu Xingxu,Yu Zhiqiang,Zhuang Weilin.One calculation method of Rock uplift pile in bearing capacity[J].Journal of southwest jiaotong university,2002,37(2):190-194.(in Chinese)
[4]朱碧堂,杨敏.抗拔桩的变形与极限承载力计算[J].建筑结构学报,2006,27(3):120-129.Zhu Biying,Yang Min.Resistance to deformation and ultimate bearing capacity of piles is calculated[J].Journal of building structures,2006,27(3):120-129.(in Chinese).
[5]王卫东,吴江斌,王向军.桩侧注浆抗拔桩的试验研究与工程应用[J].岩土工程学报(增刊2),2010(S2):284-289.Wang Weidong,Wu Jiangbin,Wang Xiangjun.Experimental study on pile of pile side grouting and engineering applications[J].Journal of geotechnical engineering(suppl 2),2010(S2):284-289..(in Chinese)
[6]陈小强,赵春风,甘爱民.砂土中抗拔桩与抗压桩模型试验研究[J].岩土力学,2011,32(3):738-744.Chen Xiaoqiang,Zhao Chunfeng,Gan Aimin.Test research on uplift pile in sandy soil and compressive pile model[J].Rock and soil mechanics,2011,32(3):738-744.(in Chinese)
[2]Meyerhof G and Adams J I.The Ultimate Uplift Capacity of Foundations[J].Canadian Geotechnical Journal,1968,5:225-244.
[3]吴兴旭,于志强,庄卫林.岩层中抗拔桩的承载力计算方法探讨[J].西南交通大学学报,2002,37(2):190-194.Wu Xingxu,Yu Zhiqiang,Zhuang Weilin.One calculation method of Rock uplift pile in bearing capacity[J].Journal of southwest jiaotong university,2002,37(2):190-194.(in Chinese)
[4]朱碧堂,杨敏.抗拔桩的变形与极限承载力计算[J].建筑结构学报,2006,27(3):120-129.Zhu Biying,Yang Min.Resistance to deformation and ultimate bearing capacity of piles is calculated[J].Journal of building structures,2006,27(3):120-129.(in Chinese).
[5]王卫东,吴江斌,王向军.桩侧注浆抗拔桩的试验研究与工程应用[J].岩土工程学报(增刊2),2010(S2):284-289.Wang Weidong,Wu Jiangbin,Wang Xiangjun.Experimental study on pile of pile side grouting and engineering applications[J].Journal of geotechnical engineering(suppl 2),2010(S2):284-289..(in Chinese)
[6]陈小强,赵春风,甘爱民.砂土中抗拔桩与抗压桩模型试验研究[J].岩土力学,2011,32(3):738-744.Chen Xiaoqiang,Zhao Chunfeng,Gan Aimin.Test research on uplift pile in sandy soil and compressive pile model[J].Rock and soil mechanics,2011,32(3):738-744.(in Chinese)