不同叶片倾角单螺旋锚桩竖向拉拔破坏机理分析
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摘要
力学模型的构建是螺旋锚桩抗拔极限承载力理论计算的前提,而极限状态下破裂面的准确描述则是衡量模型是否合理的关键。已有力学模型中破裂面的假定均建立在水平叶片的基础上,具有对称性,未考虑实际叶片倾斜状态的影响。通过对9种叶片倾角工况下单螺旋锚桩竖向拉拔过程的有限元数值计算,揭示了叶片倾角对极限状态下破裂面特征的影响规律,并在此基础上提出了可考虑叶片倾角影响的2种破裂面模型。其成果进一步深化了单螺旋锚桩竖向拉拔破坏机理的认识。
The building of mechanical model is premise to calculate pull-out ultimate capacity of screw anchor. While,the key to evaluate the model is accurate description of fracture surface under the limit state. In the existing mechanical model,the assumption of the fracture surface without considering the effect of the actual blade inclination is based on the horizontal blade,which is asymmetrical. Based on nine kinds of blade angle,the paper established the finite element model,the influence of blade angle on fracture surface under limit state is revealed. With increasing of blade angle,the asymmetry in plastic zone increases. Accordingly,based on the further quantify of fracture surface vary with blade angle,two fracture surface model considering the influence of blade angle is proposed. The results further deepen the pull-out failure mechanism of single screw anchor.
The building of mechanical model is premise to calculate pull-out ultimate capacity of screw anchor. While,the key to evaluate the model is accurate description of fracture surface under the limit state. In the existing mechanical model,the assumption of the fracture surface without considering the effect of the actual blade inclination is based on the horizontal blade,which is asymmetrical. Based on nine kinds of blade angle,the paper established the finite element model,the influence of blade angle on fracture surface under limit state is revealed. With increasing of blade angle,the asymmetry in plastic zone increases. Accordingly,based on the further quantify of fracture surface vary with blade angle,two fracture surface model considering the influence of blade angle is proposed. The results further deepen the pull-out failure mechanism of single screw anchor.
引文
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[2]李伟.太阳能发电项目建设慎用“螺旋桩”[N].新闻中心,2012,11.
[3]汪滨.螺旋锚技术及其在工程中的应用[M].北京:中国水利水电出版社,2005.
[4]张金利,阮孝政,蔡桂林.扩底桩抗拔承载特性数值分析[J].防灾减灾工程学报,2009(6):624-631.
[5]王杰,杜秋男,孙海峰,等.砂土中螺旋锚极限抗拔承载力研究[J].沈阳建筑大学学报(自然科学版),2009(1):66-70.
[6]赵振佳,王凤池.抗拔锚盘桩基础分析[J].岩土工程界,2003(2):67-69.
[7]郦建俊,黄茂松,木林隆,等.分层地基中扩底桩抗拔承载力的计算方法研究[J].岩土力学,2008(7):1997-2003.
[8]茜平一,刘祖德,刘一亮.浅埋斜拔锚板板周土体的变形破坏特征[J].岩土工程学报,1992(1):62-66.
[9]何思明.抗拔锚板基础承载力研究[J].地下空间,2002(2):145-148,189.
[10]CLEMENCE S P,VEESAERT C J.Dynamic pullout resistance of anchors in sand[C]//Proceedings of international symposium on soil structure interaction.India:Roorkee,1977.
[11]MURRAY E J,GEDDES J D.Uplift of anchor plates in sand[J].Journal of geotechnical engineering division,ASCE,1987(113):202-215.