门架式双排抗滑桩的弹塑性模型与计算分析

发布时间：2019-03-14 18:48

【摘要】：门架式双排抗滑桩的计算模型大部分将桩排间岩土体视为弹性材料,而岩土体为弹塑性材料,使得抗滑桩内力、位移计算结果与实际情况相差较大。假设桩排间岩土体为弹塑性材料,提出一种弹塑性计算模型,该模型将桩排间岩土体看作线弹性单元和塑性单元的组合,根据结构力学知识、土的本构关系和数值分析方法建立一种计算前后排抗滑桩内力的计算方法。首先,由已知的桩顶位移,并结合结构力学位移法求出桩间土总应力。根据Lade-Duncan模型导出这两个单元的基本参数,然后,结合数值分析方法计算出抗滑桩的内力,最后,结合工程实例,运用ANSYS有限元软件进行计算分析,得出门架式双排抗滑桩的内力图。对比监测数据和弹性模型计算结果表明,弹塑性模型的计算结果比弹性模型更加接近监测值。
[Abstract]:Most of the calculation models of portal double-row anti-slide piles regard the rock-soil mass between piles as elastic material and the rock-soil mass as elastic-plastic material, which makes the calculation results of internal force and displacement of anti-slide pile differ greatly from the actual situation. Assuming that the rock and soil between piles and rows are elasto-plastic materials, an elasto-plastic calculation model is proposed. The model regards the rock-soil mass between piles and rows as a combination of linear elastic elements and plastic elements, and according to the knowledge of structural mechanics, The constitutive relation and numerical analysis method of soil is established to calculate the internal force of anti-slide pile in front and rear rows. Firstly, the total stress of soil between piles is obtained by the known displacement of pile top and the method of structural force shift. According to the Lade-Duncan model, the basic parameters of the two elements are derived, and then the internal force of the anti-slide pile is calculated by the numerical analysis method. Finally, the calculation and analysis are carried out by using the finite element software of ANSYS, combined with the engineering example. The internal force diagram of the double row anti-slide pile of gantry type is obtained. The comparison between the monitoring data and the elastic model shows that the elastic-plastic model is closer to the monitoring value than the elastic model.
【作者单位】：中南大学土木工程学院;中交第二公路勘察设计研究院有限公司;
【基金】：国家自然科学基金资助(No.41102171) 中国铁路总公司科技研究开发计划项目资助(No.2013T001) 中国博士后科学基金资助(No.2012M521556) 中央高校基本科研业务费专项资金资助(No.2011QNZT115)
【分类号】：TU473.1

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