TBM再制造刀盘的损伤研究
本文选题:TBM 切入点:再制造刀盘 出处:《河北工程大学》2017年硕士论文 论文类型:学位论文
【摘要】:随着国内大中城市轨道交通建设飞速发展,地下隧道工程已进入高速发展期,我国已成为全球掘进装备需求量最多的国家。国内盾构技术也在不断提升,现有的硬岩掘进机(TBM)已近百台,其中2011年前已有35台,虽数量看似不少,但是大部分TBM已接近服役期限,若直接报废将带来巨大的资源浪费。刀盘处于TBM最前沿,与岩土直接接触,是影响TBM掘进效率最重要的部件。为解决国内大量TBM刀盘未能全寿命使用,以及再制造刀盘损伤机理研究等相关问题。通过阅读国内外文献,本文开展了TBM刀盘结构分析、宏观、微观及多元损伤方向的研究,对于提高已服役刀盘利用率、延长其服役寿命、降低成本具有重要意义。主要研究内容如下:(1)介绍了TBM刀盘结构类型,分析影响刀盘掘进性的主要参数;针对中方五分式TBM刀盘进行关键掘进参数的力学分析;建立典型TBM刀盘三维模型,应用ABAQUS有限元分析得到刀盘易发生损伤缺陷区域;(2)TBM刀盘常见宏观损伤(裂纹、变形、蠕变、焊缝开裂及疲劳损伤)的机理深入研究;针对刀盘单一宏观损伤构建典型刀盘损伤分析模型并推导了刀盘损伤程度计算方法;同时,分析对比了常见的损伤检测方法;(3)研究了细观力学知识、基因理论、金属微观损伤等先进模型,结合刀盘细小裂纹尖端应力分析探讨了TBM刀盘微观损伤相关研究。从细观力学角度,分析GTN本构模型,建立与刀盘损伤研究的联系;通过基因理论将刀盘损伤标记,遗传算法讨论刀盘损伤演变;推导刀盘在循环载荷下微观损伤裂纹萌生和裂纹尖端应力与循环次数的关系式;(4)创造性的提出再制造刀盘多元损伤耦合研究框架;主要从线性耦合和非线性耦合两方面简要分析了典型刀盘损伤耦合的关联影响因素和所涉及的相关模型方法的关系。为下一步再制造刀盘的多元损伤耦合整体模型研究、再制造刀盘剩余寿命预测和刀盘再制造评价做基础。
[Abstract]:With the rapid development of rail transit construction in large and medium-sized cities in China, the underground tunnel project has entered a period of rapid development, and China has become the country with the most demand for tunneling equipment in the world. The existing hard rock tunneling machines (TBMs) have nearly 100 units, of which 35 were before 2011. Although the number seems to be quite large, most of the TBM are close to service term. If scrapped directly, it will bring a huge waste of resources. The cutterhead is at the forefront of the TBM. Direct contact with rock and soil is the most important component affecting the efficiency of TBM tunneling. In order to solve the problems related to the failure of domestic TBM cutters to be used all over the life, and to study the damage mechanism of remanufacturing cutters, and so on, this paper has read the literature at home and abroad. In this paper, the structural analysis, macroscopical, microscopic and multivariate damage direction of TBM cutters have been studied, which can improve the utilization ratio of used cutters and prolong their service life. The main research contents are as follows: 1) introduce the structure type of TBM cutter head, analyze the main parameters that affect the heading of the cutter head, carry out the mechanical analysis of key driving parameters for the Chinese five-point TBM cutter head, and make a mechanical analysis of the key driving parameters for the five-point TBM cutter head of the Chinese side. Three dimensional model of typical TBM cutter head is established, and the mechanism of common macroscopic damage (crack, deformation, creep, weld crack and fatigue damage) of cutter head is obtained by ABAQUS finite element analysis. Aiming at the single macro damage of the cutter head, the damage analysis model of the typical cutter head is constructed and the method of calculating the damage degree of the cutter head is deduced. At the same time, the micromechanics knowledge and gene theory are studied and compared with the common damage detection method. Based on the advanced models of metal microscopic damage and the stress analysis of the tip of small crack of the cutter head, the research on the microscopic damage of the TBM cutter head is discussed. From the viewpoint of meso-mechanics, the constitutive model of GTN is analyzed, and the relation between the damage research of the cutter head and the damage of the cutter head is established. Genetic algorithm is used to discuss the evolution of cutter head damage. The relationship between crack initiation and crack tip stress under cyclic loading and the relationship between crack tip stress and cycle number are derived. In this paper, the relationship between the related factors of damage coupling of typical cutters and the related model methods is briefly analyzed from the two aspects of linear coupling and nonlinear coupling. The prediction of residual life of the remanufacturing cutter head and the evaluation of the remanufacture of the cutter head are the basis.
【学位授予单位】:河北工程大学
【学位级别】:硕士
【学位授予年份】:2017
【分类号】:U455.39
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