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Mechanical characterization of the load distribution on the cutterhead-ground interface of shield tunneling machines

机译：盾构掘进机刀盘-地面界面载荷分布的力学表征

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摘要

The paper proposes a mechanical characterization and approximate calculation method to determine the load acting on the cutterhead-ground interface of an Earth Pressure Balance (EPB) shield tunneling machine. Through a mechanical decoupling analysis of the coupling interaction between the cutterhead and the ground, the basic expressions for the normal and tangential stresses acting on the tunneling interface between the cutterhead and the ground are developed. For ease of use in engineering applications, the stress expressions are modified and simplified with the consideration of several engineering factors, such as the stress limit that the ground can bear, the overburden, and the topological structure of the cutterhead. A "bilinear" description model for the load distribution is then established; the effectiveness of this model is discussed and verified by a comparison with the laboratory experimental results and the numerical simulations in existing research. The equations for the approximate calculation of the thrust and torque on the cutterhead are also presented. This work may improve the simplified hypothesis that the cutterhead load is uniformly or linearly distributed in the current equipment design and load calculation, thereby providing a theoretical reference for cutterhead design and layout and for the analysis and calculation of loads in the tunneling process. (C) 2015 Elsevier Ltd. All rights reserved.
机译：提出了一种机械表征和近似计算方法，以确定作用在土压平衡（EPB）盾构掘进机的刀盘-地面界面上的载荷。通过对刀盘与地面的耦合作用进行机械解耦分析，得出了作用在刀盘与地面之间的隧道界面上的法向和切向应力的基本表达式。为了便于在工程应用中使用，应力表达式经过修改和简化，同时考虑了多个工程因素，例如地面可以承受的应力极限，覆盖层和刀盘的拓扑结构。然后建立一个用于负荷分配的“双线性”描述模型；通过与实验室实验结果和现有研究数值模拟的比较，讨论并验证了该模型的有效性。还介绍了近似计算刀头上的推力和扭矩的方程式。这项工作可以改善简化的假设，即在当前设备设计和载荷计算中刀盘载荷是均匀或线性分布的，从而为刀盘设计和布局以及隧道过程中的载荷分析和计算提供理论参考。 （C）2015 Elsevier Ltd.保留所有权利。

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