盾构机盘形滚刀及切刀磨损预测模型研究

【作者】 王凯；

【导师】 谭青；

【作者基本信息】 中南大学 ， 机械电子工程， 2011， 硕士

【摘要】 随着我国经济的快速发展和建设需求的持续增长,地下空间工程建设逐渐增加,盾构掘进机在地下轨道交通和隧道等工程中得到了广泛的使用。盾构法在广泛应用的同时,盾构的刀具磨损问题已成为影响盾构施工质量和进度的一个关键因素,刀具磨损失效后未及时进行更换,不仅增加了换刀难度还影响了工程进度。本文在国内外研究的基础上,结合工程实践,将建立盾构刀具磨损预测模型作为拟解决的关键问题,进行了以下研究工作：(1)总结了盾构盘形滚刀和切刀的磨损失效形式,分析了刀具磨损失效的原因以及盾构刀具的主要磨损形式,建立了盾构刀具磨粒磨损模型,并对盾构刀具磨粒磨损过程进行了三维数值仿真分析,探讨了盾构刀具的磨损机理。(2)在现有盾构刀具破岩力学模型中选取适合的盾构盘形滚刀和切刀的受力预测模型,分析了盾构盘形滚刀和切刀的运动规律,建立了盘形滚刀和切刀的运动学方程。(3)基于盾构刀具磨损机理,考虑盾构刀具的结构参数、地质参数及切削参数等因素对盾构刀具磨损状况的影响,建立了盾构刀具磨损预测模型。(4)利用盾构回转式切削实验台进行盘形滚刀破岩实验,验证了盾构滚刀破岩过程中岩石颗粒在滚刀侧面的运动轨迹和滚刀破岩过程中所存在的滑动现象,并在工程中进行刀具磨损的调研和测量,得到了刀具的相应磨损状况,对所建立的盾构刀具磨损预测模型进行工程验证。更多还原

【Abstract】 With the rapid development of economy and the inceasingly growth of the building needs, the underground engineering construction gradually increases and shield tunneling machine in the underground rail and tunnel projects has been widely used. At the same time, the shield cutter wear has become a key factor affecting the shield construction quality and schedule. If the cutter is not promptly replaced after the wear failure, it not only increases the difficulty of the cutter replacement, but also affects the engineering progress. This paper, based on substantial literature, combined with engineering practice, establishes the shield cutter wear prediction models as the key issues to solve. The content of the paper is as follows:(1) This paper summarizes the shield disc cutter and scraper wear failure modes, analyzes the corresponding reason of the cutter wear failure and the main form of the cutter wear. The abrasive wear model of the shield cutter is established, the three-dimensional numerical simulation of the abrasive wear process of the shield cutter is analyzed and the shield cutter wear mechanism is studied.(2) The appropriate force prediction models of disc cutter and scraper are selected in the existing rock breaking mechanical models of shield cutter, and the motion laws of shield disc cutter and scraper are analyzed and the kinematic equations of shield disc cutter and scraper are established.(3) Based on the shield cutter wear mechanism, considering the effect of structural parameters, geological parameters, cutting parameters and other factors of the shield cutter, the shield cutter wear prediction models are established.(4) The rock breaking experiment of disc cutter is carried on in the shield rotative cutting test platform, which verifies the kinematic trajectory of the rock particles at the side of the disc cutter and the sliding phenomenon generated in the rock breaking process of the shield disc cutter. At the same time, the research and measurement of the cutter wear loss in the engineering projects are done, and the corresponding wear status is obtained, which can provide the engineering verification for the established shield cutter wear prediction models.更多还原