Agitation Resistance of Muck on Rotary Digging of Underground

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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.