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  Study on chamber pressure and slurry level of mixed shield by prototype test

  Nowadays, more precise control method on face pressure of slurry shield is beingadopted, combining air pressure control at the upper part of an air chamber with conventional slurry flow control. To grasp the feature and the control method of the air combined system, a prototype test was carried out using the model, which is composed of a cutter chamber, an air chamber, a slurry circulation system, and an air circulation system. The obtained results of the air combined system were compared with those of the conventional system. As a result, the followings were made clear: the feature of the air combined system; the factors affecting face support pressure in the air combined system; and their mechanism. Furthermore, the time dependent measured face support pressures at some sites using the conventional system were examined and the characteristics of the both control systems affecting to ground stability were discussed.

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