Agitation Resistance of Muck on Rotary Digging of Underground

在设计地下旋挖机时，如何确定驱动旋挖机各部分的电动机的最佳设备转矩，以及如何防止充填在挖掘腔内的淤泥堵塞，是最重要的问题。本文以土压平衡式盾构机为研究对象。本文旨在从理论和实验两个方面研究搅拌腔中的搅拌阻力和污泥流动状况。首先，研究了淤泥性质和中间梁转动频率对搅拌阻力和淤泥流动状态的影响，并通过缩尺模型试验研究了搅拌阻力与淤泥流动状态之间的关系。缩比模型为实际机器的腔室部分的1/10缩比模型。在搅拌阻力方面，将实验结果与简易估算法的计算结果进行了比较，指出了简易估算法的注意事项。通过对缩尺模型试验结果与实机试验结果之间的缩尺模型化理论进行检验，以估算实机的搅拌阻力，并与实机的施工结果相吻合。采用离散元法对排土搅拌阻力和排土流动状态进行了理论分析。并与实验结果进行了比较。验证了离散元方法的有效性，并对改进离散元方法进行搅拌分析具有指导意义。本研究探讨土压平衡式盾构机产生搅拌阻力的机制。在此基础上，应继续研究不同地质条件下的地下结构类型和运行条件。为盾构机的优化设计提供了基础数据。

On designing underground rotary digging machine, it is the most important problem to estimate the optimum equipment torque of the electric motor which drives the rotary digging parts of the machine and to prevent the clog of the muck filled in the chamber. In this study, earth pressure balanced shield machine is investigated. The purpose of this study is to make clear the agitation resistance and the state of muck flowage in the chamber theoretically and experimentally. First, the influence of the muck properties and the rotational freguency of intermediate beams on the agitation resistance and the state of muck flowage were investigated and the relation between the agitation resistance and the state of muck flowage in chamber of a scale model was studied. The scale model is a 1/10 scale model for chamber part of actual machine. On the agitation resistance, the results of the experiment were compared with the calculation results by simple estimation method, and the matters to pay attention in the simple estimation method were shown. The scale modeling theory between the results of the scale model experiment and those of actual machines was examined to estimate the agitation resistance of actural machine with refering to the construction results of actual machine. Moreover, the muck agitation resistance and the state of muck flowage were analyzed theoretically by using Distinct Element Method (DEM). The results were compared with the experimental ones. The usefulness of DEM has been verified and the guide to improve DEM for agitation analysis has been shown. In this study, the mechanism for the agitation resistance to occur has been clarified on earth pressure balanced shield machine. After this, the study on different structure types and operating conditions for underground having various kinds of geological features should be continued. This leads to getting the basic data to conduct the optimum design of shield machines.