Abstract
The physical scaled model is developed, the air-distribution system of the impact drive of the model is equipped with an elastic valve in the air supply system, and the drive provides step-by-step control of the impact pulse frequency under conditions of a single impact with a constant energy. The experimental relationships are established for the variations of the soil drifter movement velocity in the course of the tunnel advance within the studied range of the operating frequency of its impact drive and the feeding of a power traction organ. The relations between consolidated and excavated soil portions are determined for different technological modes of the tunnel advance.
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