考虑材料非线性的柔性注压锚杆锚固特性研究

发布时间：2018-04-24 03:16

本文选题：柔性注压锚杆 + 材料非线性　；参考：《青岛科技大学》2015年硕士论文

【摘要】：柔性注压锚杆是一种结构新颖且锚固机理独特的锚杆,但因对其锚固特性的研究还不够深入,使得目前市场上对锚杆生产与使用不够广泛,本文主要研究柔性注压锚杆的锚固特性,为柔性注压锚杆的设计与制造提供理论依据。首先,了解构成锚杆杆体的高分子材料的主要特性,对比几种常用的非线性材料的本构模型,了解各种本构模型适用的材料,选择最适合于柔性注压锚杆体材料的本构模型Mooney-Rivilin模型,对比几种确定本构模型参数的方法,最终确定本文要用的材料参数值。其次,建立柔性注压锚杆锚固系统的二维有限元计算模型,采用单一变量法,分析锚固系统主要结构参数对锚杆锚固系统最大当量应力和接触应力的影响规律,确定最适合锚杆进行锚固作业的结构参数,进而给出柔性注压锚杆的最优化结构。与将锚杆体简化为线弹性材料计算所得结果做对比,为柔性注压锚杆的设计制造及使用提供依据。最后,建立锚杆锚固段与围岩体的锚固系统的三维有限元计算模型,通过二次加载的方式,模拟锚杆锚固段应力分布规律,对比线弹性材料的模拟结果。研究锚固系统摩擦系数以及锚杆体材料对锚固段接触应力与最大阻抗摩擦应力的影响。
[Abstract]:Flexible pressure-injection bolt is a kind of anchor rod with novel structure and unique anchoring mechanism. However, the research on its anchoring characteristics is not deep enough, which makes the production and application of anchor rod not widely used in the market at present. In this paper, the anchoring characteristics of flexible pressure-injection bolt are studied, which provides a theoretical basis for the design and manufacture of flexible pressure-injection anchor. First of all, we understand the main characteristics of the polymer materials that make up the bolt body, compare the constitutive models of several common nonlinear materials, and understand the materials applicable to the various constitutive models. The constitutive model Mooney-Rivilin model, which is the most suitable for flexible pressure-injection bolt material, is selected and compared with several methods to determine the parameters of the constitutive model. Finally, the value of the material parameters to be used in this paper is determined. Secondly, a two-dimensional finite element model of flexible pressure-injection anchoring system is established, and the influence of the main structural parameters of the anchoring system on the maximum equivalent stress and contact stress of the anchor system is analyzed by using a single variable method. The optimum structure of flexible pressure-injection bolt is given by determining the structure parameters that are most suitable for anchoring. Compared with the calculated results of simplifying the bolt body to linear elastic material, it provides the basis for the design, manufacture and application of flexible pressure-injection anchor. Finally, the three-dimensional finite element model of anchoring system of anchor rod and surrounding rock is established. The stress distribution of anchor bolt is simulated by secondary loading, and the simulation results of linear elastic material are compared. The influence of the friction coefficient of the anchoring system and the material of the anchor body on the contact stress and the maximum impedance friction stress of the anchoring section are studied.
【学位授予单位】：青岛科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD353.6;TQ317

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